CN113355303B - 一种m-mlv逆转录酶突变体及其应用 - Google Patents
一种m-mlv逆转录酶突变体及其应用 Download PDFInfo
- Publication number
- CN113355303B CN113355303B CN202110634550.9A CN202110634550A CN113355303B CN 113355303 B CN113355303 B CN 113355303B CN 202110634550 A CN202110634550 A CN 202110634550A CN 113355303 B CN113355303 B CN 113355303B
- Authority
- CN
- China
- Prior art keywords
- gly
- cys
- ala
- thr
- reverse transcriptase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 102100034343 Integrase Human genes 0.000 title claims abstract description 94
- 108010092799 RNA-directed DNA polymerase Proteins 0.000 title claims abstract description 88
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000010839 reverse transcription Methods 0.000 claims description 21
- 108020004414 DNA Proteins 0.000 claims description 6
- 239000013604 expression vector Substances 0.000 claims description 6
- 238000003259 recombinant expression Methods 0.000 claims description 4
- 239000002773 nucleotide Substances 0.000 claims description 3
- 125000003729 nucleotide group Chemical group 0.000 claims description 3
- 102000053602 DNA Human genes 0.000 claims description 2
- 238000010367 cloning Methods 0.000 claims description 2
- 239000011535 reaction buffer Substances 0.000 claims description 2
- 230000001131 transforming effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 abstract description 17
- 210000004369 blood Anatomy 0.000 abstract description 14
- 239000008280 blood Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 12
- 238000012216 screening Methods 0.000 abstract description 8
- 206010036790 Productive cough Diseases 0.000 abstract description 7
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 210000003802 sputum Anatomy 0.000 abstract description 7
- 208000024794 sputum Diseases 0.000 abstract description 7
- 238000010804 cDNA synthesis Methods 0.000 abstract description 4
- 238000009510 drug design Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 3
- 238000002741 site-directed mutagenesis Methods 0.000 abstract description 2
- 125000003275 alpha amino acid group Chemical group 0.000 abstract 1
- 108010061238 threonyl-glycine Proteins 0.000 description 51
- 108010047495 alanylglycine Proteins 0.000 description 36
- 108010004073 cysteinylcysteine Proteins 0.000 description 32
- VPZXBVLAVMBEQI-UHFFFAOYSA-N glycyl-DL-alpha-alanine Natural products OC(=O)C(C)NC(=O)CN VPZXBVLAVMBEQI-UHFFFAOYSA-N 0.000 description 31
- ALNKNYKSZPSLBD-ZDLURKLDSA-N Cys-Thr-Gly Chemical compound [H]N[C@@H](CS)C(=O)N[C@@H]([C@@H](C)O)C(=O)NCC(O)=O ALNKNYKSZPSLBD-ZDLURKLDSA-N 0.000 description 30
- GVVKYKCOFMMTKZ-WHFBIAKZSA-N Gly-Cys-Ala Chemical compound OC(=O)[C@H](C)NC(=O)[C@H](CS)NC(=O)CN GVVKYKCOFMMTKZ-WHFBIAKZSA-N 0.000 description 28
- ZJBWJHQDOIMVLM-WHFBIAKZSA-N Cys-Cys-Gly Chemical compound SC[C@H](N)C(=O)N[C@@H](CS)C(=O)NCC(O)=O ZJBWJHQDOIMVLM-WHFBIAKZSA-N 0.000 description 25
- XKUKSGPZAADMRA-UHFFFAOYSA-N glycyl-glycyl-glycine Natural products NCC(=O)NCC(=O)NCC(O)=O XKUKSGPZAADMRA-UHFFFAOYSA-N 0.000 description 24
- 108010076324 alanyl-glycyl-glycine Proteins 0.000 description 22
- SLUWOCTZVGMURC-BFHQHQDPSA-N Thr-Gly-Ala Chemical compound C[C@@H](O)[C@H](N)C(=O)NCC(=O)N[C@@H](C)C(O)=O SLUWOCTZVGMURC-BFHQHQDPSA-N 0.000 description 20
- AEJSNWMRPXAKCW-WHFBIAKZSA-N Cys-Ala-Gly Chemical compound SC[C@H](N)C(=O)N[C@@H](C)C(=O)NCC(O)=O AEJSNWMRPXAKCW-WHFBIAKZSA-N 0.000 description 18
- 108010016616 cysteinylglycine Proteins 0.000 description 18
- RCQRKPUXJAGEEC-ZLUOBGJFSA-N Ala-Cys-Cys Chemical compound C[C@H](N)C(=O)N[C@@H](CS)C(=O)N[C@@H](CS)C(O)=O RCQRKPUXJAGEEC-ZLUOBGJFSA-N 0.000 description 17
- UWQJHXKARZWDIJ-ZLUOBGJFSA-N Ala-Ala-Cys Chemical compound C[C@H](N)C(=O)N[C@@H](C)C(=O)N[C@@H](CS)C(O)=O UWQJHXKARZWDIJ-ZLUOBGJFSA-N 0.000 description 16
- PYTZFYUXZZHOAD-WHFBIAKZSA-N Gly-Ala-Ala Chemical compound OC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)CN PYTZFYUXZZHOAD-WHFBIAKZSA-N 0.000 description 16
- UQJNXZSSGQIPIQ-FBCQKBJTSA-N Gly-Gly-Thr Chemical compound C[C@@H](O)[C@@H](C(O)=O)NC(=O)CNC(=O)CN UQJNXZSSGQIPIQ-FBCQKBJTSA-N 0.000 description 15
- ZKJZBRHRWKLVSJ-ZDLURKLDSA-N Gly-Thr-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CS)C(=O)O)NC(=O)CN)O ZKJZBRHRWKLVSJ-ZDLURKLDSA-N 0.000 description 15
- LJFNNUBZSZCZFN-WHFBIAKZSA-N Ala-Gly-Cys Chemical compound N[C@@H](C)C(=O)NCC(=O)N[C@@H](CS)C(=O)O LJFNNUBZSZCZFN-WHFBIAKZSA-N 0.000 description 14
- CVOZXIPULQQFNY-ZLUOBGJFSA-N Cys-Ala-Cys Chemical compound C[C@H](NC(=O)[C@@H](N)CS)C(=O)N[C@@H](CS)C(O)=O CVOZXIPULQQFNY-ZLUOBGJFSA-N 0.000 description 14
- QSDKBRMVXSWAQE-BFHQHQDPSA-N Gly-Ala-Thr Chemical compound C[C@@H](O)[C@@H](C(O)=O)NC(=O)[C@H](C)NC(=O)CN QSDKBRMVXSWAQE-BFHQHQDPSA-N 0.000 description 14
- TVTZEOHWHUVYCG-KYNKHSRBSA-N Gly-Thr-Thr Chemical compound [H]NCC(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H]([C@@H](C)O)C(O)=O TVTZEOHWHUVYCG-KYNKHSRBSA-N 0.000 description 14
- QWMPARMKIDVBLV-VZFHVOOUSA-N Thr-Cys-Ala Chemical compound C[C@@H](O)[C@H](N)C(=O)N[C@@H](CS)C(=O)N[C@@H](C)C(O)=O QWMPARMKIDVBLV-VZFHVOOUSA-N 0.000 description 14
- UZJDBCHMIQXLOQ-HEIBUPTGSA-N Thr-Cys-Thr Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CS)C(=O)N[C@@H]([C@@H](C)O)C(=O)O)N)O UZJDBCHMIQXLOQ-HEIBUPTGSA-N 0.000 description 14
- XPNSAQMEAVSQRD-FBCQKBJTSA-N Thr-Gly-Gly Chemical compound C[C@@H](O)[C@H](N)C(=O)NCC(=O)NCC(O)=O XPNSAQMEAVSQRD-FBCQKBJTSA-N 0.000 description 14
- WNHNMKOFKCHKKD-BFHQHQDPSA-N Ala-Thr-Gly Chemical compound [H]N[C@@H](C)C(=O)N[C@@H]([C@@H](C)O)C(=O)NCC(O)=O WNHNMKOFKCHKKD-BFHQHQDPSA-N 0.000 description 13
- IDOGEHIWMJMAHT-BYPYZUCNSA-N Gly-Gly-Cys Chemical compound NCC(=O)NCC(=O)N[C@@H](CS)C(O)=O IDOGEHIWMJMAHT-BYPYZUCNSA-N 0.000 description 13
- RLMISHABBKUNFO-WHFBIAKZSA-N Ala-Ala-Gly Chemical compound C[C@H](N)C(=O)N[C@@H](C)C(=O)NCC(O)=O RLMISHABBKUNFO-WHFBIAKZSA-N 0.000 description 12
- KUFVXLQLDHJVOG-SHGPDSBTSA-N Ala-Thr-Thr Chemical compound C[C@H]([C@@H](C(=O)N[C@@H]([C@@H](C)O)C(=O)O)NC(=O)[C@H](C)N)O KUFVXLQLDHJVOG-SHGPDSBTSA-N 0.000 description 12
- 108010079364 N-glycylalanine Proteins 0.000 description 12
- WYKJENSCCRJLRC-ZDLURKLDSA-N Thr-Gly-Cys Chemical compound C[C@H]([C@@H](C(=O)NCC(=O)N[C@@H](CS)C(=O)O)N)O WYKJENSCCRJLRC-ZDLURKLDSA-N 0.000 description 12
- FFJQHWKSGAWSTJ-BFHQHQDPSA-N Gly-Thr-Ala Chemical compound [H]NCC(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C)C(O)=O FFJQHWKSGAWSTJ-BFHQHQDPSA-N 0.000 description 11
- UQCNIMDPYICBTR-KYNKHSRBSA-N Thr-Thr-Gly Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H]([C@@H](C)O)C(=O)NCC(O)=O UQCNIMDPYICBTR-KYNKHSRBSA-N 0.000 description 11
- 108091032973 (ribonucleotides)n+m Proteins 0.000 description 10
- QKHWNPQNOHEFST-VZFHVOOUSA-N Ala-Thr-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CS)C(=O)O)NC(=O)[C@H](C)N)O QKHWNPQNOHEFST-VZFHVOOUSA-N 0.000 description 10
- SMYXEYRYCLIPIL-ZLUOBGJFSA-N Cys-Cys-Cys Chemical compound SC[C@H](N)C(=O)N[C@@H](CS)C(=O)N[C@@H](CS)C(O)=O SMYXEYRYCLIPIL-ZLUOBGJFSA-N 0.000 description 10
- KOHBWQDSVCARMI-BWBBJGPYSA-N Cys-Cys-Thr Chemical compound [H]N[C@@H](CS)C(=O)N[C@@H](CS)C(=O)N[C@@H]([C@@H](C)O)C(O)=O KOHBWQDSVCARMI-BWBBJGPYSA-N 0.000 description 10
- CEXINUGNTZFNRY-BYPYZUCNSA-N Gly-Cys-Gly Chemical compound [NH3+]CC(=O)N[C@@H](CS)C(=O)NCC([O-])=O CEXINUGNTZFNRY-BYPYZUCNSA-N 0.000 description 10
- VNBNZUAPOYGRDB-ZDLURKLDSA-N Gly-Cys-Thr Chemical compound C[C@H]([C@@H](C(=O)O)NC(=O)[C@H](CS)NC(=O)CN)O VNBNZUAPOYGRDB-ZDLURKLDSA-N 0.000 description 10
- 108010089804 glycyl-threonine Proteins 0.000 description 10
- JBVSSSZFNTXJDX-YTLHQDLWSA-N Ala-Ala-Thr Chemical compound C[C@@H](O)[C@@H](C(O)=O)NC(=O)[C@H](C)NC(=O)[C@H](C)N JBVSSSZFNTXJDX-YTLHQDLWSA-N 0.000 description 9
- VGPWRRFOPXVGOH-BYPYZUCNSA-N Ala-Gly-Gly Chemical compound C[C@H](N)C(=O)NCC(=O)NCC(O)=O VGPWRRFOPXVGOH-BYPYZUCNSA-N 0.000 description 9
- OXOQBEVULIBOSH-ZDLURKLDSA-N Cys-Gly-Thr Chemical compound [H]N[C@@H](CS)C(=O)NCC(=O)N[C@@H]([C@@H](C)O)C(O)=O OXOQBEVULIBOSH-ZDLURKLDSA-N 0.000 description 9
- 239000002299 complementary DNA Substances 0.000 description 9
- NMROINAYXCACKF-WHFBIAKZSA-N Gly-Cys-Cys Chemical compound NCC(=O)N[C@@H](CS)C(=O)N[C@@H](CS)C(O)=O NMROINAYXCACKF-WHFBIAKZSA-N 0.000 description 8
- IGROJMCBGRFRGI-YTLHQDLWSA-N Thr-Ala-Ala Chemical compound C[C@@H](O)[C@H](N)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(O)=O IGROJMCBGRFRGI-YTLHQDLWSA-N 0.000 description 8
- COYHRQWNJDJCNA-NUJDXYNKSA-N Thr-Thr-Thr Chemical compound C[C@@H](O)[C@H](N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H]([C@@H](C)O)C(O)=O COYHRQWNJDJCNA-NUJDXYNKSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- DECCMEWNXSNSDO-ZLUOBGJFSA-N Ala-Cys-Ala Chemical compound C[C@H](N)C(=O)N[C@@H](CS)C(=O)N[C@@H](C)C(O)=O DECCMEWNXSNSDO-ZLUOBGJFSA-N 0.000 description 7
- TVYMKYUSZSVOAG-ZLUOBGJFSA-N Cys-Ala-Ala Chemical compound [H]N[C@@H](CS)C(=O)N[C@@H](C)C(=O)N[C@@H](C)C(O)=O TVYMKYUSZSVOAG-ZLUOBGJFSA-N 0.000 description 7
- DZLQXIFVQFTFJY-BYPYZUCNSA-N Cys-Gly-Gly Chemical compound SC[C@H](N)C(=O)NCC(=O)NCC(O)=O DZLQXIFVQFTFJY-BYPYZUCNSA-N 0.000 description 7
- CAJFZCICSVBOJK-SHGPDSBTSA-N Thr-Ala-Thr Chemical compound C[C@@H](O)[C@H](N)C(=O)N[C@@H](C)C(=O)N[C@@H]([C@@H](C)O)C(O)=O CAJFZCICSVBOJK-SHGPDSBTSA-N 0.000 description 7
- NDZYTIMDOZMECO-SHGPDSBTSA-N Thr-Thr-Ala Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C)C(O)=O NDZYTIMDOZMECO-SHGPDSBTSA-N 0.000 description 7
- 108010084264 glycyl-glycyl-cysteine Proteins 0.000 description 7
- 108090000623 proteins and genes Proteins 0.000 description 7
- 102000004169 proteins and genes Human genes 0.000 description 7
- ZVFVBBGVOILKPO-WHFBIAKZSA-N Ala-Gly-Ala Chemical compound C[C@H](N)C(=O)NCC(=O)N[C@@H](C)C(O)=O ZVFVBBGVOILKPO-WHFBIAKZSA-N 0.000 description 6
- YFXFOZPXVFPBDH-VZFHVOOUSA-N Cys-Ala-Thr Chemical compound C[C@@H](O)[C@H](NC(=O)[C@H](C)NC(=O)[C@@H](N)CS)C(O)=O YFXFOZPXVFPBDH-VZFHVOOUSA-N 0.000 description 6
- HYKFOHGZGLOCAY-ZLUOBGJFSA-N Cys-Cys-Ala Chemical compound [H]N[C@@H](CS)C(=O)N[C@@H](CS)C(=O)N[C@@H](C)C(O)=O HYKFOHGZGLOCAY-ZLUOBGJFSA-N 0.000 description 6
- URDUGPGPLNXXES-WHFBIAKZSA-N Cys-Gly-Cys Chemical compound SC[C@H](N)C(=O)NCC(=O)N[C@@H](CS)C(O)=O URDUGPGPLNXXES-WHFBIAKZSA-N 0.000 description 6
- 101710203526 Integrase Proteins 0.000 description 6
- 241000713869 Moloney murine leukemia virus Species 0.000 description 6
- 238000011529 RT qPCR Methods 0.000 description 6
- KBBRNEDOYWMIJP-KYNKHSRBSA-N Thr-Gly-Thr Chemical compound C[C@H]([C@@H](C(=O)NCC(=O)N[C@@H]([C@@H](C)O)C(=O)O)N)O KBBRNEDOYWMIJP-KYNKHSRBSA-N 0.000 description 6
- TZQWJCGVCIJDMU-HEIBUPTGSA-N Thr-Thr-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CS)C(=O)O)N)O TZQWJCGVCIJDMU-HEIBUPTGSA-N 0.000 description 6
- 150000001413 amino acids Chemical class 0.000 description 6
- 238000012795 verification Methods 0.000 description 6
- SBGXWWCLHIOABR-UHFFFAOYSA-N Ala Ala Gly Ala Chemical compound CC(N)C(=O)NC(C)C(=O)NCC(=O)NC(C)C(O)=O SBGXWWCLHIOABR-UHFFFAOYSA-N 0.000 description 5
- OEVCHROQUIVQFZ-YTLHQDLWSA-N Ala-Thr-Ala Chemical compound C[C@H](N)C(=O)N[C@@H]([C@H](O)C)C(=O)N[C@@H](C)C(O)=O OEVCHROQUIVQFZ-YTLHQDLWSA-N 0.000 description 5
- CVLIHKBUPSFRQP-WHFBIAKZSA-N Cys-Gly-Ala Chemical compound [H]N[C@@H](CS)C(=O)NCC(=O)N[C@@H](C)C(O)=O CVLIHKBUPSFRQP-WHFBIAKZSA-N 0.000 description 5
- CCQOOWAONKGYKQ-BYPYZUCNSA-N Gly-Gly-Ala Chemical compound OC(=O)[C@H](C)NC(=O)CNC(=O)CN CCQOOWAONKGYKQ-BYPYZUCNSA-N 0.000 description 5
- DGOJNGCGEYOBKN-BWBBJGPYSA-N Thr-Cys-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CS)C(=O)N[C@@H](CS)C(=O)O)N)O DGOJNGCGEYOBKN-BWBBJGPYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- UQJUGHFKNKGHFQ-VZFHVOOUSA-N Ala-Cys-Thr Chemical compound [H]N[C@@H](C)C(=O)N[C@@H](CS)C(=O)N[C@@H]([C@@H](C)O)C(O)=O UQJUGHFKNKGHFQ-VZFHVOOUSA-N 0.000 description 4
- 102000004190 Enzymes Human genes 0.000 description 4
- 108090000790 Enzymes Proteins 0.000 description 4
- JQFILXICXLDTRR-FBCQKBJTSA-N Gly-Thr-Gly Chemical compound NCC(=O)N[C@@H]([C@H](O)C)C(=O)NCC(O)=O JQFILXICXLDTRR-FBCQKBJTSA-N 0.000 description 4
- LYGKYFKSZTUXGZ-ZDLURKLDSA-N Thr-Cys-Gly Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CS)C(=O)NCC(O)=O LYGKYFKSZTUXGZ-ZDLURKLDSA-N 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 229940088598 enzyme Drugs 0.000 description 4
- 230000035772 mutation Effects 0.000 description 4
- GQGAFTPXAPKSCF-WHFBIAKZSA-N Gly-Ala-Cys Chemical compound NCC(=O)N[C@@H](C)C(=O)N[C@@H](CS)C(=O)O GQGAFTPXAPKSCF-WHFBIAKZSA-N 0.000 description 3
- UGVQELHRNUDMAA-BYPYZUCNSA-N Gly-Ala-Gly Chemical compound [NH3+]CC(=O)N[C@@H](C)C(=O)NCC([O-])=O UGVQELHRNUDMAA-BYPYZUCNSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- YRNBANYVJJBGDI-VZFHVOOUSA-N Thr-Ala-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](C)C(=O)N[C@@H](CS)C(=O)O)N)O YRNBANYVJJBGDI-VZFHVOOUSA-N 0.000 description 3
- 230000027455 binding Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- OBVSBEYOMDWLRJ-BFHQHQDPSA-N Ala-Gly-Thr Chemical compound C[C@@H](O)[C@@H](C(O)=O)NC(=O)CNC(=O)[C@H](C)N OBVSBEYOMDWLRJ-BFHQHQDPSA-N 0.000 description 2
- 241000713838 Avian myeloblastosis virus Species 0.000 description 2
- NRVQLLDIJJEIIZ-VZFHVOOUSA-N Cys-Thr-Ala Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](C)C(=O)O)NC(=O)[C@H](CS)N)O NRVQLLDIJJEIIZ-VZFHVOOUSA-N 0.000 description 2
- 108010014303 DNA-directed DNA polymerase Proteins 0.000 description 2
- 102000016928 DNA-directed DNA polymerase Human genes 0.000 description 2
- 206010062717 Increased upper airway secretion Diseases 0.000 description 2
- 241001529936 Murinae Species 0.000 description 2
- 238000012408 PCR amplification Methods 0.000 description 2
- TYVAWPFQYFPSBR-BFHQHQDPSA-N Thr-Ala-Gly Chemical compound [H]N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C)C(=O)NCC(O)=O TYVAWPFQYFPSBR-BFHQHQDPSA-N 0.000 description 2
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 108010067216 glycyl-glycyl-glycine Proteins 0.000 description 2
- 238000013537 high throughput screening Methods 0.000 description 2
- 238000000338 in vitro Methods 0.000 description 2
- 208000026435 phlegm Diseases 0.000 description 2
- 239000013612 plasmid Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000003161 ribonuclease inhibitor Substances 0.000 description 2
- 238000002702 ribosome display Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000007160 ty medium Substances 0.000 description 2
- 238000010200 validation analysis Methods 0.000 description 2
- 239000013598 vector Substances 0.000 description 2
- QMOQBVOBWVNSNO-UHFFFAOYSA-N 2-[[2-[[2-[(2-azaniumylacetyl)amino]acetyl]amino]acetyl]amino]acetate Chemical compound NCC(=O)NCC(=O)NCC(=O)NCC(O)=O QMOQBVOBWVNSNO-UHFFFAOYSA-N 0.000 description 1
- QKNYBSVHEMOAJP-UHFFFAOYSA-N 2-amino-2-(hydroxymethyl)propane-1,3-diol;hydron;chloride Chemical compound Cl.OCC(N)(CO)CO QKNYBSVHEMOAJP-UHFFFAOYSA-N 0.000 description 1
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 108010085238 Actins Proteins 0.000 description 1
- KRHRBKYBJXMYBB-WHFBIAKZSA-N Ala-Cys-Gly Chemical compound C[C@H](N)C(=O)N[C@@H](CS)C(=O)NCC(O)=O KRHRBKYBJXMYBB-WHFBIAKZSA-N 0.000 description 1
- YMIYZAOBQDRCPP-UHFFFAOYSA-N Ala-Thr-Cys-Cys Chemical compound CC(N)C(=O)NC(C(O)C)C(=O)NC(CS)C(=O)NC(CS)C(O)=O YMIYZAOBQDRCPP-UHFFFAOYSA-N 0.000 description 1
- 108020004705 Codon Proteins 0.000 description 1
- FTTZLFIEUQHLHH-BWBBJGPYSA-N Cys-Thr-Cys Chemical compound C[C@H]([C@@H](C(=O)N[C@@H](CS)C(=O)O)NC(=O)[C@H](CS)N)O FTTZLFIEUQHLHH-BWBBJGPYSA-N 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- SRBFZHDQGSBBOR-HWQSCIPKSA-N L-arabinopyranose Chemical compound O[C@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-HWQSCIPKSA-N 0.000 description 1
- 102000016943 Muramidase Human genes 0.000 description 1
- 108010014251 Muramidase Proteins 0.000 description 1
- 241000714177 Murine leukemia virus Species 0.000 description 1
- 108010062010 N-Acetylmuramoyl-L-alanine Amidase Proteins 0.000 description 1
- 238000002123 RNA extraction Methods 0.000 description 1
- 239000013614 RNA sample Substances 0.000 description 1
- CGNLCCVKSWNSDG-UHFFFAOYSA-N SYBR Green I Chemical compound CN(C)CCCN(CCC)C1=CC(C=C2N(C3=CC=CC=C3S2)C)=C2C=CC=CC2=[N+]1C1=CC=CC=C1 CGNLCCVKSWNSDG-UHFFFAOYSA-N 0.000 description 1
- 101100043635 Solanum tuberosum SS2 gene Proteins 0.000 description 1
- 241001052560 Thallis Species 0.000 description 1
- PYMYPHUHKUWMLA-WDCZJNDASA-N arabinose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)C=O PYMYPHUHKUWMLA-WDCZJNDASA-N 0.000 description 1
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003833 bile salt Substances 0.000 description 1
- 229940093761 bile salts Drugs 0.000 description 1
- 239000012472 biological sample Substances 0.000 description 1
- 239000011692 calcium ascorbate Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000287 crude extract Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000539 dimer Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000013613 expression plasmid Substances 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000012215 gene cloning Methods 0.000 description 1
- 150000003278 haem Chemical class 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229960000274 lysozyme Drugs 0.000 description 1
- 235000010335 lysozyme Nutrition 0.000 description 1
- 239000004325 lysozyme Substances 0.000 description 1
- 108020004999 messenger RNA Proteins 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000009871 nonspecific binding Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 108700004029 pol Genes Proteins 0.000 description 1
- 101150088264 pol gene Proteins 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001742 protein purification Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000003757 reverse transcription PCR Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000002415 sodium dodecyl sulfate polyacrylamide gel electrophoresis Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/10—Transferases (2.)
- C12N9/12—Transferases (2.) transferring phosphorus containing groups, e.g. kinases (2.7)
- C12N9/1241—Nucleotidyltransferases (2.7.7)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
- C12Q1/686—Polymerase chain reaction [PCR]
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y207/00—Transferases transferring phosphorus-containing groups (2.7)
- C12Y207/07—Nucleotidyltransferases (2.7.7)
- C12Y207/07049—RNA-directed DNA polymerase (2.7.7.49), i.e. telomerase or reverse-transcriptase
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Organic Chemistry (AREA)
- Genetics & Genomics (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Microbiology (AREA)
- Biomedical Technology (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Biophysics (AREA)
- Analytical Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Immunology (AREA)
- Plant Pathology (AREA)
- Enzymes And Modification Thereof (AREA)
Abstract
本发明公开了一种M‑MLV逆转录酶突变体及其应用，所述M‑MLV逆转录酶突变体的氨基酸序列如序列表中的SEQ ID NO.2所示。本发明提供的逆转录酶，在野生型M‑MLV逆转录酶的基础上，结合已有对逆转录酶结构研究进展，融合多个突变体的结构特点，通过定点诱变理性设计筛选得到，该逆转录酶突变体具有很强的抑制物耐受性，降低了抑制物对cDNA合成的干扰，在添加全血以及痰液的样本反应过程中，本发明所述的突变型逆转录酶活性不受影响或影响很小。与此同时，本发明提供的逆转录酶突变体能够耐受70℃的高温，在具有较好热稳定性的同时，也具有较高的反应灵敏度和准确性，具有极强的应用前景。
Description
技术领域
本发明涉及生物技术领域，具体涉及一种M-MLV逆转录酶突变体及其应用。
背景技术
逆转录酶(Reverse transcriptase)通常具有三种活性：以RNA为模板的DNA聚合酶活性、以DNA为模板的DNA聚合酶活性以及降解RNA-DNA杂合链中RNA的RNase H活性。因此，逆转录酶常用于cDNA文库构建、mRNA测序、RT-PCR定量等，被广泛应用于研究及医学分子诊断领域。莫洛泥鼠白血病病毒(Moloney Murine LeukemiaVirus,MMLV)或禽类成髓细胞白血病病毒(Avian Myeloblastosis Virus,AMV)pol基因产生的逆转录酶是两种最常用的逆转录酶，AMV逆转录酶的RNase H活性较高且热稳定性高，但产物的产量低；MMLV逆转录酶产量较高，但热稳定性差，因其单体结构特征，易于进行改造，在应用更为广泛。
逆转录酶的合成能力是其应用中十分重要的参数，具有高合成能力的逆转录酶通常具有高的底物亲和力或可高效催化合成cDNA。逆转录酶的RNase H活性可降解RNA-DNA杂合体中的RNA，可能会造成RNA模板在完成全长逆转录前被降解，降低逆转录效率，因此，商业化逆转录酶的RNase H活性通常会被改造以弱化其降解RNA-DNA杂合体中的RNA的功能，提高长链cDNA产量。模板RNA的形成二级结构也是影响逆转录酶催化效率的重要因素，通常可以通过提高反应温度来打开其二级结构，这就要求逆转录酶的反应温度相应提高。此外，生物学样本常含有会抑制逆转录酶活性的物质，如土壤和植物中的腐殖酸、血液中的血红素、粪便中的胆汁盐等，这些物质在RNA提取过程中并不能被完全去除，因此，提高逆转录酶对抑制物的耐受性是亟待解决的重要方面。
在提高逆转录酶的性能的研究中，主要集中于提高其热稳定性和催化效率上，其中Thermo Fisher使用体外区室化核糖体展示技术(Compartmentalized RibosomeDisplay,CRD)进行高通量筛选，获得热稳定性提高的不同的突变株。这些热稳定性提高的突变株，突变位点集中于酶的活性中心及RNase H结构域。但是热稳定性提高的逆转录酶可能会伴随催化活性降低以及抑制物耐受性降低的缺点。具有高温耐受性的逆转录酶可降低反应中引物二聚体的形成，对于检测低浓度模板具有优势，能够耐受血液或痰液等样本的逆转录酶可作为体外诊断试剂中分子诊断用酶，对于简化样本处理流程、减少污染有重要意义，因此临床上亟需一种具有较好热稳定以及催化效率，同时能够耐受抑制物的逆转录酶。
发明内容
基于上述技术问题，发明人根据蛋白结构特征及关键氨基酸位点进行理性设计，将具有不同优良性能的突变株性能结合，在野生型M-MLV逆转录酶的基础上，采用DNA改组技术，融合多个突变体的结构特点，结合高通量筛选方法得到一系列具有更强抑制物耐受性、更高热稳定性以及催化活性的逆转录酶。
本发明提供一种M-MLV逆转录酶突变体，采用如下技术手段：一种M-MLV逆转录酶突变体，其特征在于，所述M-MLV逆转录酶突变体核苷酸序列如SEQ ID NO.1所示。
一种重组表达载体，是将编码上述M-MLV逆转录酶突变体的DNA分子克隆入表达载体得到。
一种重组工程细胞株，是将上述重组表达载体转化入工程细胞得到。
一种逆转录反应试剂盒，包括如上所述M-MLV逆转录酶突变体。
优选地，所述试剂盒还包括PCR用水、逆转录反应缓冲液、dNTPs和逆转录反应引物中的至少一种。
一种如上述的M-MLV逆转录酶突变体在逆转录反应中的应用。
本发明的有益效果在于：
(1)本发明在野生型M-MLV逆转录酶的基础上，结合已有对逆转录酶结构研究进展，融合多个突变体的结构特点，通过定点诱变理性设计筛选得到新的逆转录酶。该逆转录酶具有很强的抑制物耐受性，降低了抑制物对cDNA合成的额外干扰，在添加全血以及痰液的样本反应过程中，本发明所述的突变型逆转录酶活性不受影响或影响很小。
(2)本发明提供的M-MLV逆转录酶突变体，能够耐受70℃的高温，在具有较好热稳定性的同时，也具有较高的反应灵敏度和准确性，具有极强的应用前景。
附图说明
图1为本发明实施例2验证逆转录酶灵敏度的PCR扩增曲线图。
具体实施例
本文包括以下的实施例，用于以例证的方式更清楚、明确地阐述本发明的技术方案。本领域技术人员根据本文的公开应当理解，可以在所公开的特定的实施方式中进行许多改变但是仍然获得相似或类似的结果，而不偏离本发明的思想和范围。本发明的具体实施方式仅用于解释本发明，而非意图通过任何方式限制本发明。
实施例1M-MLV逆转录酶突变体的构建
1.逆转录酶突变株质粒构建
根据野生型MMLV逆转录酶蛋白序列，进行适用于大肠杆菌的密码子优化后，插入载体pBAD-hisA中作为野生型逆转录酶的表达质粒。根据逆转录酶结构特点，突变位点主要选择：
(1)参与底物结合和cDNA合成的结构域，突变氨基酸可提高底物结合能力；
(2)连接聚合酶结构域与RNaseH结构域的氨基酸，突变氨基酸提高其稳定性；
(3)RNase H结构域，突变氨基酸以改善提热稳定性或抑制物耐受性及合成长链cDNA能力。
在逆转录酶结构基础上，首先将对野生型MMLV的RNaseH结构域D524及D583定点突变为D524G、D583N，得到突变株1，目的为降低其RNaseH活性。在突变株1的基础上，设计饱和突变引物，将突变株1表达蛋白的聚合酶结构域氨基酸E69、L139、F155、V223、E302、W313、L435进行饱和突变，构建人工DNA文库。文库选用的载体为pBAD-HisA，宿主为DH10B，该系统既可用于基因克隆，也可在用于阿拉伯糖诱导情况下的蛋白表达。
2.蛋白表达及突变体筛选
突变体文库用48孔板进行高通量筛选。从平板中选择克隆接种于含有Amp的TY培养基中，37℃培养过夜后，按照1％转接于含有Amp的TY培养基中，37℃培养至OD600＝1时，添加终浓度为0.8mg/mL L-阿拉伯糖，转移至25℃诱导表达约20h。收集菌体，通过溶菌酶破碎获得逆转录酶粗提液。
(1)筛选热稳定性高的逆转录酶
以1ng鼠总RNA为模板，进行逆转录反应。
反应体系：
| 试剂(Reagent) | 体积(Volume)(μL) |
| 5×RT缓冲液 | 2.0 |
| 10mMdNTPmix(各10mM) | 2.0 |
| RNA酶抑制剂(40U/μL) | 2.5 |
| Oligo(dT)18引物 | 1.0 |
| RT(逆转录酶)(40U/μL) | 0.1 |
| RNase-freeddH2O | 补齐至20 |
反应程序：
反应结束后，取1μL反应产物作为qPCR模板，用北京擎科新业生物技术有限公司的2×TSINGKE Master qPCR Master Mix(SYBR Green I)(货号TSE201)及鼠β-actin基因特异性引物(F：GTGACGTTGACATCCGTAAAGA，R：GCCGGACTCATCGTACTCC)进行PCR扩增，筛选扩增Ct低于野生型MMLV的突变株；
(2)筛选耐受全血样品的逆转录酶
将上述筛选出的具有热稳定性的突变体粗酶液，进行抑制物耐受性筛选。
反应体系：
| 试剂(Reagent) | 体积(Volume)(μL) |
| 5×RT缓冲液 | 2.0 |
| 10mMdNTPmix(各10mM) | 2.0 |
| RNA酶抑制剂(40U/μL) | 2.5 |
| Oligo(dT)18引物 | 1.0 |
| RT(逆转录酶)(40U/μL) | 0.1 |
| RNase-freeddH2O | 补齐至20 |
如上，向体系中额外添加0.1％的全血样本，逆转录温度仍设置为50℃，筛选扩增Ct低于不添加全血的突变株。
经过两轮筛选后，得到的突变体即为兼具热稳定性高及耐受一定程度全血样本的优良菌株。将得到的突变体质粒进行测序，突变菌株用于扩大培养。
3.蛋白纯化
蛋白表达菌体用高压均质机破碎后，通过Ni-NTA亲和纯化、SP阳离子纯化后，透析浓缩获得纯化后蛋白，蛋白经过透析后储存于储存溶液(50mM Tris-HCl,100mM KCl,1mMDTT,0.1％Triton X-100,50％glycerol,pH 8.0)中。通过BCA法测定蛋白浓度，将储存液浓度调整为0.5mg/mL；酶液经SDS-PAGE电泳显示纯度大于98％。
经过上述筛选过程，最终获得一个逆转录酶，所述逆转录酶的核苷酸序列为：SEQID No.1。
实施例2M-MLV逆转录酶突变体性能验证
对获得的突变型逆转录酶进行性能评价，选取临床样本进行检测，共设置3组反应体系，所述3组反应体系均按照实施例1所述反应体系进行配置，区别仅在于逆转录酶，其余组分及用量完全相同。
A组：逆转录酶为本发明所述逆转录酶；
B组：逆转录酶为Thermo Fisher的SuperScriptⅢ(SSⅢ)；
C组：逆转录酶为Thermo Fisher的SuperScriptⅣ(SSⅣ)。
(1)M-MLV逆转录酶突变体的热稳定性验证
为检测逆转录酶的热稳定性，将上述3组反应体系分别在50℃、60℃以及70℃下发生逆转录反应，随后利用qPCR技术检测反应结果，结果(Ct值)如下表所示：
表1热稳定性验证
注：ΔCt(1)＝Ct(60℃)-Ct(50℃)；ΔCt(2)＝Ct(70℃)-Ct(50℃)。
实验结果显示，本发明所述的M-MLV逆转录酶突变体较市售的两种逆转录酶具有更好的热稳定性，能够耐受70℃的高温，在此温度下，所需逆转录的RNA样本的二级结构基本被打开，且提升了引物与样本的亲和结合能力，降低了体系中的非特异性结合，进而能够提升cDNA的合成效率以及合成cDNA的质量。使用本发明提供的逆转录酶突变体进行逆转录反应时，能够对复杂结构的RNA模板进行高效的逆转录反应，合成更高质量的cDNA。
(2)M-MLV逆转录酶突变体的抑制物耐受性验证
为检测逆转录酶对于痰液抑制物的耐受性，向上述3组反应体系中分别添加0％-20％(v/v)的痰液，随后在60℃下发生逆转录反应，利用qPCR技术检测反应结果，结果如下表所示：
表2痰液抑制物验证
| 痰液浓度/％ | 0 | 2.0 | 5.0 | 10 | 15 | 20 | ΔCt(1) | ΔCt(2) | ΔCt(3) | ΔCt(4) | ΔCt(5) |
| A | 28.32 | 29.27 | 29.43 | 29.75 | 29.8 | 29.87 | 0.95 | 1.11 | 1.43 | 1.48 | 1.55 |
| B | 28.33 | 31.41 | 31.56 | 32.31 | 34.00 | 34.15 | 3.08 | 3.23 | 3.98 | 5.67 | 5.82 |
| C | 28.35 | 29.55 | 29.6 | 30.05 | 31.25 | 31.75 | 1.20 | 1.25 | 1.70 | 2.90 | 3.40 |
注：ΔCt(1)＝Ct(2.0％)-Ct(0％)；ΔCt(2)＝Ct(5.0％)-Ct(0％)；ΔCt(3)＝Ct(10％)-Ct(0％)；ΔCt(4)＝Ct(15％)-Ct(0％)；ΔCt(5)＝Ct(20％)-Ct(0％)。
为检测逆转录酶对于全血抑制物的耐受性，向上述3组反应体系中分别添加0％-5％(v/v)的全血，随后在60℃下发生逆转录反应，利用qPCR技术检测反应结果，结果如下表所示：
表3全血抑制物验证
| 全血浓度/％ | 0 | 0.1 | 0.5 | 1.0 | 2.0 | 5.0 | ΔCt(1) | ΔCt(2) | ΔCt(3) | ΔCt(4) | ΔCt(5) |
| A | 21.41 | 21.02 | 22.07 | 24.3 | 24.71 | 24.61 | -0.39 | 0.66 | 2.89 | 3.30 | 3.20 |
| B | 21.81 | 22.37 | 26.05 | 29.12 | 30.34 | 33.05 | 0.56 | 4.24 | 7.31 | 8.53 | 11.24 |
| C | 21.42 | 21.21 | 22.53 | 26.16 | 25.79 | 29.12 | -0.21 | 1.11 | 4.74 | 4.37 | 7.70 |
注：ΔCt(1)＝Ct(0.1％)-Ct(0％)；ΔCt(2)＝Ct(0.5％)-Ct(0％)；ΔCt(3)＝Ct(1.0％)-Ct(0％)；ΔCt(4)＝Ct(2.0％)-Ct(0％)；ΔCt(5)＝Ct(5.％)-Ct(0％)。
实验结果显示，本发明所述的M-MLV逆转录酶突变体较市售的两种逆转录酶具有更强的耐抑制物能力，在全血及痰液存在的情况下，本发明所述的逆转录酶突变体的活性仍不受影响。在20μL逆转录体系中，能够耐受5.0％(v/v)全血以及20％(v/v)痰液，降低了抑制物组分对cDNA合成的干扰，提高cDNA完整率和得率。使用本发明提供的逆转录酶突变体进行逆转录反应时，能够对复杂结构的RNA模板进行高效的逆转录反应，合成更高质量的cDNA。
(3)M-MLV逆转录酶突变体的反应灵敏度验证
为检测逆转录酶对于低浓度样本的灵敏度，将1μg RNA模板进行10倍梯度稀释，使用上述3组反应体系分别在60℃下发生逆转录反应，利用qPCR技术检测反应结果，结果如下表所示：
表4灵敏度验证
| 稀释倍数 | A | B | C |
| 1 | 30.85 | 31.27 | 30.71 |
| 2 | 32.01 | 32.35 | 31.59 |
| 4 | 32.68 | 34.45 | 32.54 |
| 8 | 33.96 | 35.25 | 33.90 |
| 16 | 35.78 | 36.78 | 35.17 |
| 32 | 36.43 | 36.39 | 36.04 |
| 64 | 36.20 | 36.88 | 36.80 |
结果显示，本发明所述的逆转录酶对于低浓度样本的检测灵敏度与C组(ThermoFisher的SuperScriptⅣ(SSⅣ)相当，同时显著优于B组(Thermo Fisher的SuperScriptⅣ(SSII)(如附图1所示)。本发明通过对逆转录酶的理性设计，得到了兼具耐受高温及耐受样本中抑制物的逆转录酶突变体，于此同时，该逆转录突变体具有较优的检查灵敏度，可应用于体外分子诊断试剂中，对于降低对进口产品的依赖具有重要意义。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在不脱离本发明的原理和宗旨的情况下在本发明的范围内可以对上述实施例进行变化、修改、替换和变形。
序列表
<110> 重庆中元汇吉生物技术有限公司
<120> 一种M-MLV逆转录酶突变体及其应用
<130> 2021.3.29
<160> 2
<170> SIPOSequenceListing 1.0
<210> 1
<211> 2031
<212> DNA
<213> MOUSE
<400> 1
accctgaaca tcgaagatga acatcgtctg catgaaacca gcaaagaacc ggatgttagc 60
ctgggtagca cctggctgag cgattttccg caggcatggg cagaaaccgg tggtatgggt 120
ctggcagttc gtcaggcacc gctgattatt ccgctgaaag caaccagcac accggttagc 180
attaaacagt atccgatgag ccagaaagcc cgtctgggta ttaaaccgca tattcagcgt 240
ctgctggatc agggtattct ggttccgtgt cagagcccgt ggaatacacc gctgctgccg 300
gttaaaaaac cgggtacaaa tgattatcgt ccggttcagg atctgcgtga agttaataaa 360
cgcgtggaag atattcatcc gaccgttccg aatccgtata atctgctgag cggtccgcct 420
ccgagccatc agtggtatac cgttctggat ctgaaagatg cctatttttg tctgcgtctg 480
catccgacca gccagccgct gtttgcattt gaatggcgtg atccggaaat gggtattagc 540
ggtcaactga cctggacccg tctgccgcag ggttttaaaa atagcccgac cctgtttgat 600
gaggccctgc atcgtgatct ggcagatttt cgtattcagc atccggatct gattctgctg 660
cagtatatgg atgatctgct gctggcagca accagcgaac tggattgtca gcagggcacc 720
cgtgcactgc tgcagaccct gggtaatctg ggttatcgtg caagcgcaaa aaaagcacag 780
atttgtcaga aacaggtgaa atatctgggc tatctgctga aagaaggtca gcgttggctg 840
accgaagcac gtaaagaaac cgttatgggt cagccgaccc cgaaaacacc gcgtcagctg 900
cgtaaatttc tgggtacagc aggtttctgc cgtctgttca ttccgggttt tgcagaaatg 960
gcagcaccgc tgtatccgct gaccaaaacc ggcaccctgt ttaattgggg tccggatcag 1020
cagaaagcct atcaagaaat taaacaggca ctgctgaccg caccggcact gggtctgcct 1080
gacctgacca aaccgtttga actgtttgtg gatgaaaaac agggttatgc aaaaggtgtt 1140
ctgacccaga aactgggtcc gtggcgtcgt ccggttgcat atctgagcaa aaaactggat 1200
ccggttgcag caggttggcc tccgtgtctg cgtatggttg cagcaattgc agttctgacc 1260
aaagatgcag gtaaactgac aatgggtcag ccgctggtta ttggggcacc gcatgcagtt 1320
gaagcactgg ttaaacagcc tccggatcgt tggctgagca atgcccgtat gacccattat 1380
caggccctgc tgctggatac cgatcgtgtt cagtttggtc cggttgttgc actgaatccg 1440
gcaaccctgc tgccgctgcc ggaagaaggt ctgcagcata attgtctgga tattctggcc 1500
gaagcacatg gcacccgtcc ggatctgaca gatcagccgc tgcctgatgc agatcatacc 1560
tggtataccg gcggtagcag cctgctgcaa gagggccagc gtaaagccgg tgcagcagtt 1620
accaccgaaa ccgaagttat ttgggcaaaa gcactgcctg ctggcaccag cgcacagcgt 1680
gcagagctga ttgcactgac ccaggcactg aaaatggccg aaggtaaaaa actgaatgtg 1740
tataccaaca gccgctatgc atttgcaacc gcacatattc atggcgaaat ttatcgtcgt 1800
cgtggtttgc tgaccagcga aggtaaagaa attaaaaata aagatgaaat tctggccctg 1860
ctgaaagcac tgtttctgcc gaaacgtctg agcattattc attgtccggg tcatcagaaa 1920
ggtcatagcg cagaagcacg cggtaatcgt atggcagatc aggcagcacg taaagcagca 1980
attaccgaaa ccccggatac cagcaccctg ctgattgaaa atagcagccc g 2031
<210> 2
<211> 2031
<212> PRT
<213> MOUSE
<400> 2
Ala Cys Cys Cys Thr Gly Ala Ala Cys Ala Thr Cys Gly Ala Ala Gly
1 5 10 15
Ala Thr Gly Ala Ala Cys Ala Thr Cys Gly Thr Cys Thr Gly Cys Ala
20 25 30
Thr Gly Ala Ala Ala Cys Cys Ala Gly Cys Ala Ala Ala Gly Ala Ala
35 40 45
Cys Cys Gly Gly Ala Thr Gly Thr Thr Ala Gly Cys Cys Thr Gly Gly
50 55 60
Gly Thr Ala Gly Cys Ala Cys Cys Thr Gly Gly Cys Thr Gly Ala Gly
65 70 75 80
Cys Gly Ala Thr Thr Thr Thr Cys Cys Gly Cys Ala Gly Gly Cys Ala
85 90 95
Thr Gly Gly Gly Cys Ala Gly Ala Ala Ala Cys Cys Gly Gly Thr Gly
100 105 110
Gly Thr Ala Thr Gly Gly Gly Thr Cys Thr Gly Gly Cys Ala Gly Thr
115 120 125
Thr Cys Gly Thr Cys Ala Gly Gly Cys Ala Cys Cys Gly Cys Thr Gly
130 135 140
Ala Thr Thr Ala Thr Thr Cys Cys Gly Cys Thr Gly Ala Ala Ala Gly
145 150 155 160
Cys Ala Ala Cys Cys Ala Gly Cys Ala Cys Ala Cys Cys Gly Gly Thr
165 170 175
Thr Ala Gly Cys Ala Thr Thr Ala Ala Ala Cys Ala Gly Thr Ala Thr
180 185 190
Cys Cys Gly Ala Thr Gly Ala Gly Cys Cys Ala Gly Ala Ala Ala Gly
195 200 205
Cys Cys Cys Gly Thr Cys Thr Gly Gly Gly Thr Ala Thr Thr Ala Ala
210 215 220
Ala Cys Cys Gly Cys Ala Thr Ala Thr Thr Cys Ala Gly Cys Gly Thr
225 230 235 240
Cys Thr Gly Cys Thr Gly Gly Ala Thr Cys Ala Gly Gly Gly Thr Ala
245 250 255
Thr Thr Cys Thr Gly Gly Thr Thr Cys Cys Gly Thr Gly Thr Cys Ala
260 265 270
Gly Ala Gly Cys Cys Cys Gly Thr Gly Gly Ala Ala Thr Ala Cys Ala
275 280 285
Cys Cys Gly Cys Thr Gly Cys Thr Gly Cys Cys Gly Gly Thr Thr Ala
290 295 300
Ala Ala Ala Ala Ala Cys Cys Gly Gly Gly Thr Ala Cys Ala Ala Ala
305 310 315 320
Thr Gly Ala Thr Thr Ala Thr Cys Gly Thr Cys Cys Gly Gly Thr Thr
325 330 335
Cys Ala Gly Gly Ala Thr Cys Thr Gly Cys Gly Thr Gly Ala Ala Gly
340 345 350
Thr Thr Ala Ala Thr Ala Ala Ala Cys Gly Cys Gly Thr Gly Gly Ala
355 360 365
Ala Gly Ala Thr Ala Thr Thr Cys Ala Thr Cys Cys Gly Ala Cys Cys
370 375 380
Gly Thr Thr Cys Cys Gly Ala Ala Thr Cys Cys Gly Thr Ala Thr Ala
385 390 395 400
Ala Thr Cys Thr Gly Cys Thr Gly Ala Gly Cys Gly Gly Thr Cys Cys
405 410 415
Gly Cys Cys Thr Cys Cys Gly Ala Gly Cys Cys Ala Thr Cys Ala Gly
420 425 430
Thr Gly Gly Thr Ala Thr Ala Cys Cys Gly Thr Thr Cys Thr Gly Gly
435 440 445
Ala Thr Cys Thr Gly Ala Ala Ala Gly Ala Thr Gly Cys Cys Thr Ala
450 455 460
Thr Thr Thr Thr Thr Gly Thr Cys Thr Gly Cys Gly Thr Cys Thr Gly
465 470 475 480
Cys Ala Thr Cys Cys Gly Ala Cys Cys Ala Gly Cys Cys Ala Gly Cys
485 490 495
Cys Gly Cys Thr Gly Thr Thr Thr Gly Cys Ala Thr Thr Thr Gly Ala
500 505 510
Ala Thr Gly Gly Cys Gly Thr Gly Ala Thr Cys Cys Gly Gly Ala Ala
515 520 525
Ala Thr Gly Gly Gly Thr Ala Thr Thr Ala Gly Cys Gly Gly Thr Cys
530 535 540
Ala Ala Cys Thr Gly Ala Cys Cys Thr Gly Gly Ala Cys Cys Cys Gly
545 550 555 560
Thr Cys Thr Gly Cys Cys Gly Cys Ala Gly Gly Gly Thr Thr Thr Thr
565 570 575
Ala Ala Ala Ala Ala Thr Ala Gly Cys Cys Cys Gly Ala Cys Cys Cys
580 585 590
Thr Gly Thr Thr Thr Gly Ala Thr Gly Ala Gly Gly Cys Cys Cys Thr
595 600 605
Gly Cys Ala Thr Cys Gly Thr Gly Ala Thr Cys Thr Gly Gly Cys Ala
610 615 620
Gly Ala Thr Thr Thr Thr Cys Gly Thr Ala Thr Thr Cys Ala Gly Cys
625 630 635 640
Ala Thr Cys Cys Gly Gly Ala Thr Cys Thr Gly Ala Thr Thr Cys Thr
645 650 655
Gly Cys Thr Gly Cys Ala Gly Thr Ala Thr Ala Thr Gly Gly Ala Thr
660 665 670
Gly Ala Thr Cys Thr Gly Cys Thr Gly Cys Thr Gly Gly Cys Ala Gly
675 680 685
Cys Ala Ala Cys Cys Ala Gly Cys Gly Ala Ala Cys Thr Gly Gly Ala
690 695 700
Thr Thr Gly Thr Cys Ala Gly Cys Ala Gly Gly Gly Cys Ala Cys Cys
705 710 715 720
Cys Gly Thr Gly Cys Ala Cys Thr Gly Cys Thr Gly Cys Ala Gly Ala
725 730 735
Cys Cys Cys Thr Gly Gly Gly Thr Ala Ala Thr Cys Thr Gly Gly Gly
740 745 750
Thr Thr Ala Thr Cys Gly Thr Gly Cys Ala Ala Gly Cys Gly Cys Ala
755 760 765
Ala Ala Ala Ala Ala Ala Gly Cys Ala Cys Ala Gly Ala Thr Thr Thr
770 775 780
Gly Thr Cys Ala Gly Ala Ala Ala Cys Ala Gly Gly Thr Gly Ala Ala
785 790 795 800
Ala Thr Ala Thr Cys Thr Gly Gly Gly Cys Thr Ala Thr Cys Thr Gly
805 810 815
Cys Thr Gly Ala Ala Ala Gly Ala Ala Gly Gly Thr Cys Ala Gly Cys
820 825 830
Gly Thr Thr Gly Gly Cys Thr Gly Ala Cys Cys Gly Ala Ala Gly Cys
835 840 845
Ala Cys Gly Thr Ala Ala Ala Gly Ala Ala Ala Cys Cys Gly Thr Thr
850 855 860
Ala Thr Gly Gly Gly Thr Cys Ala Gly Cys Cys Gly Ala Cys Cys Cys
865 870 875 880
Cys Gly Ala Ala Ala Ala Cys Ala Cys Cys Gly Cys Gly Thr Cys Ala
885 890 895
Gly Cys Thr Gly Cys Gly Thr Ala Ala Ala Thr Thr Thr Cys Thr Gly
900 905 910
Gly Gly Thr Ala Cys Ala Gly Cys Ala Gly Gly Thr Thr Thr Cys Thr
915 920 925
Gly Cys Cys Gly Thr Cys Thr Gly Thr Thr Cys Ala Thr Thr Cys Cys
930 935 940
Gly Gly Gly Thr Thr Thr Thr Gly Cys Ala Gly Ala Ala Ala Thr Gly
945 950 955 960
Gly Cys Ala Gly Cys Ala Cys Cys Gly Cys Thr Gly Thr Ala Thr Cys
965 970 975
Cys Gly Cys Thr Gly Ala Cys Cys Ala Ala Ala Ala Cys Cys Gly Gly
980 985 990
Cys Ala Cys Cys Cys Thr Gly Thr Thr Thr Ala Ala Thr Thr Gly Gly
995 1000 1005
Gly Gly Thr Cys Cys Gly Gly Ala Thr Cys Ala Gly Cys Ala Gly Ala
1010 1015 1020
Ala Ala Gly Cys Cys Thr Ala Thr Cys Ala Ala Gly Ala Ala Ala Thr
1025 1030 1035 1040
Thr Ala Ala Ala Cys Ala Gly Gly Cys Ala Cys Thr Gly Cys Thr Gly
1045 1050 1055
Ala Cys Cys Gly Cys Ala Cys Cys Gly Gly Cys Ala Cys Thr Gly Gly
1060 1065 1070
Gly Thr Cys Thr Gly Cys Cys Thr Gly Ala Cys Cys Thr Gly Ala Cys
1075 1080 1085
Cys Ala Ala Ala Cys Cys Gly Thr Thr Thr Gly Ala Ala Cys Thr Gly
1090 1095 1100
Thr Thr Thr Gly Thr Gly Gly Ala Thr Gly Ala Ala Ala Ala Ala Cys
1105 1110 1115 1120
Ala Gly Gly Gly Thr Thr Ala Thr Gly Cys Ala Ala Ala Ala Gly Gly
1125 1130 1135
Thr Gly Thr Thr Cys Thr Gly Ala Cys Cys Cys Ala Gly Ala Ala Ala
1140 1145 1150
Cys Thr Gly Gly Gly Thr Cys Cys Gly Thr Gly Gly Cys Gly Thr Cys
1155 1160 1165
Gly Thr Cys Cys Gly Gly Thr Thr Gly Cys Ala Thr Ala Thr Cys Thr
1170 1175 1180
Gly Ala Gly Cys Ala Ala Ala Ala Ala Ala Cys Thr Gly Gly Ala Thr
1185 1190 1195 1200
Cys Cys Gly Gly Thr Thr Gly Cys Ala Gly Cys Ala Gly Gly Thr Thr
1205 1210 1215
Gly Gly Cys Cys Thr Cys Cys Gly Thr Gly Thr Cys Thr Gly Cys Gly
1220 1225 1230
Thr Ala Thr Gly Gly Thr Thr Gly Cys Ala Gly Cys Ala Ala Thr Thr
1235 1240 1245
Gly Cys Ala Gly Thr Thr Cys Thr Gly Ala Cys Cys Ala Ala Ala Gly
1250 1255 1260
Ala Thr Gly Cys Ala Gly Gly Thr Ala Ala Ala Cys Thr Gly Ala Cys
1265 1270 1275 1280
Ala Ala Thr Gly Gly Gly Thr Cys Ala Gly Cys Cys Gly Cys Thr Gly
1285 1290 1295
Gly Thr Thr Ala Thr Thr Gly Gly Gly Gly Cys Ala Cys Cys Gly Cys
1300 1305 1310
Ala Thr Gly Cys Ala Gly Thr Thr Gly Ala Ala Gly Cys Ala Cys Thr
1315 1320 1325
Gly Gly Thr Thr Ala Ala Ala Cys Ala Gly Cys Cys Thr Cys Cys Gly
1330 1335 1340
Gly Ala Thr Cys Gly Thr Thr Gly Gly Cys Thr Gly Ala Gly Cys Ala
1345 1350 1355 1360
Ala Thr Gly Cys Cys Cys Gly Thr Ala Thr Gly Ala Cys Cys Cys Ala
1365 1370 1375
Thr Thr Ala Thr Cys Ala Gly Gly Cys Cys Cys Thr Gly Cys Thr Gly
1380 1385 1390
Cys Thr Gly Gly Ala Thr Ala Cys Cys Gly Ala Thr Cys Gly Thr Gly
1395 1400 1405
Thr Thr Cys Ala Gly Thr Thr Thr Gly Gly Thr Cys Cys Gly Gly Thr
1410 1415 1420
Thr Gly Thr Thr Gly Cys Ala Cys Thr Gly Ala Ala Thr Cys Cys Gly
1425 1430 1435 1440
Gly Cys Ala Ala Cys Cys Cys Thr Gly Cys Thr Gly Cys Cys Gly Cys
1445 1450 1455
Thr Gly Cys Cys Gly Gly Ala Ala Gly Ala Ala Gly Gly Thr Cys Thr
1460 1465 1470
Gly Cys Ala Gly Cys Ala Thr Ala Ala Thr Thr Gly Thr Cys Thr Gly
1475 1480 1485
Gly Ala Thr Ala Thr Thr Cys Thr Gly Gly Cys Cys Gly Ala Ala Gly
1490 1495 1500
Cys Ala Cys Ala Thr Gly Gly Cys Ala Cys Cys Cys Gly Thr Cys Cys
1505 1510 1515 1520
Gly Gly Ala Thr Cys Thr Gly Ala Cys Ala Gly Ala Thr Cys Ala Gly
1525 1530 1535
Cys Cys Gly Cys Thr Gly Cys Cys Thr Gly Ala Thr Gly Cys Ala Gly
1540 1545 1550
Ala Thr Cys Ala Thr Ala Cys Cys Thr Gly Gly Thr Ala Thr Ala Cys
1555 1560 1565
Cys Gly Gly Cys Gly Gly Thr Ala Gly Cys Ala Gly Cys Cys Thr Gly
1570 1575 1580
Cys Thr Gly Cys Ala Ala Gly Ala Gly Gly Gly Cys Cys Ala Gly Cys
1585 1590 1595 1600
Gly Thr Ala Ala Ala Gly Cys Cys Gly Gly Thr Gly Cys Ala Gly Cys
1605 1610 1615
Ala Gly Thr Thr Ala Cys Cys Ala Cys Cys Gly Ala Ala Ala Cys Cys
1620 1625 1630
Gly Ala Ala Gly Thr Thr Ala Thr Thr Thr Gly Gly Gly Cys Ala Ala
1635 1640 1645
Ala Ala Gly Cys Ala Cys Thr Gly Cys Cys Thr Gly Cys Thr Gly Gly
1650 1655 1660
Cys Ala Cys Cys Ala Gly Cys Gly Cys Ala Cys Ala Gly Cys Gly Thr
1665 1670 1675 1680
Gly Cys Ala Gly Ala Gly Cys Thr Gly Ala Thr Thr Gly Cys Ala Cys
1685 1690 1695
Thr Gly Ala Cys Cys Cys Ala Gly Gly Cys Ala Cys Thr Gly Ala Ala
1700 1705 1710
Ala Ala Thr Gly Gly Cys Cys Gly Ala Ala Gly Gly Thr Ala Ala Ala
1715 1720 1725
Ala Ala Ala Cys Thr Gly Ala Ala Thr Gly Thr Gly Thr Ala Thr Ala
1730 1735 1740
Cys Cys Ala Ala Cys Ala Gly Cys Cys Gly Cys Thr Ala Thr Gly Cys
1745 1750 1755 1760
Ala Thr Thr Thr Gly Cys Ala Ala Cys Cys Gly Cys Ala Cys Ala Thr
1765 1770 1775
Ala Thr Thr Cys Ala Thr Gly Gly Cys Gly Ala Ala Ala Thr Thr Thr
1780 1785 1790
Ala Thr Cys Gly Thr Cys Gly Thr Cys Gly Thr Gly Gly Thr Thr Thr
1795 1800 1805
Gly Cys Thr Gly Ala Cys Cys Ala Gly Cys Gly Ala Ala Gly Gly Thr
1810 1815 1820
Ala Ala Ala Gly Ala Ala Ala Thr Thr Ala Ala Ala Ala Ala Thr Ala
1825 1830 1835 1840
Ala Ala Gly Ala Thr Gly Ala Ala Ala Thr Thr Cys Thr Gly Gly Cys
1845 1850 1855
Cys Cys Thr Gly Cys Thr Gly Ala Ala Ala Gly Cys Ala Cys Thr Gly
1860 1865 1870
Thr Thr Thr Cys Thr Gly Cys Cys Gly Ala Ala Ala Cys Gly Thr Cys
1875 1880 1885
Thr Gly Ala Gly Cys Ala Thr Thr Ala Thr Thr Cys Ala Thr Thr Gly
1890 1895 1900
Thr Cys Cys Gly Gly Gly Thr Cys Ala Thr Cys Ala Gly Ala Ala Ala
1905 1910 1915 1920
Gly Gly Thr Cys Ala Thr Ala Gly Cys Gly Cys Ala Gly Ala Ala Gly
1925 1930 1935
Cys Ala Cys Gly Cys Gly Gly Thr Ala Ala Thr Cys Gly Thr Ala Thr
1940 1945 1950
Gly Gly Cys Ala Gly Ala Thr Cys Ala Gly Gly Cys Ala Gly Cys Ala
1955 1960 1965
Cys Gly Thr Ala Ala Ala Gly Cys Ala Gly Cys Ala Ala Thr Thr Ala
1970 1975 1980
Cys Cys Gly Ala Ala Ala Cys Cys Cys Cys Gly Gly Ala Thr Ala Cys
1985 1990 1995 2000
Cys Ala Gly Cys Ala Cys Cys Cys Thr Gly Cys Thr Gly Ala Thr Thr
2005 2010 2015
Gly Ala Ala Ala Ala Thr Ala Gly Cys Ala Gly Cys Cys Cys Gly
2020 2025 2030
Claims (6)
1.一种M-MLV逆转录酶突变体，其特征在于，所述M-MLV逆转录酶突变体核苷酸序列如SEQ ID NO.1所示。
2.一种重组表达载体，其特征在于，是将编码权利要求1中所述的M-MLV逆转录酶突变体的DNA分子克隆入表达载体得到。
3.一种重组工程细胞株，其特征在于，是将权利要求2所述的重组表达载体转化入工程细胞得到。
4.一种逆转录反应试剂盒，其特征在于，包括如权利要求1所述的M-MLV逆转录酶突变体。
5.根据权利要求4所述的试剂盒，其特征在于，所述试剂盒还包括PCR用水、逆转录反应缓冲液、dNTPs和逆转录反应引物中的至少一种。
6.一种如权利要求1所述的M-MLV逆转录酶突变体在逆转录反应中的应用。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110634550.9A CN113355303B (zh) | 2021-06-07 | 2021-06-07 | 一种m-mlv逆转录酶突变体及其应用 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110634550.9A CN113355303B (zh) | 2021-06-07 | 2021-06-07 | 一种m-mlv逆转录酶突变体及其应用 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113355303A CN113355303A (zh) | 2021-09-07 |
| CN113355303B true CN113355303B (zh) | 2023-06-16 |
Family
ID=77532957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110634550.9A Active CN113355303B (zh) | 2021-06-07 | 2021-06-07 | 一种m-mlv逆转录酶突变体及其应用 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113355303B (zh) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261352B (zh) * | 2022-06-08 | 2024-03-29 | 厦门通灵生物医药科技有限公司 | 一种耐高温的突变型逆转录酶及其制备方法 |
| CN116515792B (zh) * | 2023-04-10 | 2024-01-26 | 新镁(上海)生物技术有限公司 | Mmlv逆转录酶突变体及其应用 |
| CN118406670B (zh) * | 2024-05-06 | 2025-06-27 | 湖南艾科瑞生物工程有限公司 | 一种mmlv逆转录酶突变体及其应用 |
| CN119082076A (zh) * | 2024-09-26 | 2024-12-06 | 康润景星(苏州)生物科技有限公司 | 一种用于热启动反转录酶突变体及其应用 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021153A (zh) * | 1996-10-01 | 2011-04-20 | 杰龙公司 | 人类的端粒酶催化亚单位 |
| CN106164261A (zh) * | 2014-01-22 | 2016-11-23 | 生命技术公司 | 适用于高温核酸合成的新颖逆转录酶 |
| CN110637084A (zh) * | 2017-04-26 | 2019-12-31 | 10X基因组学有限公司 | Mmlv逆转录酶变体 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924002B (zh) * | 2014-05-04 | 2016-01-20 | 山东大学 | 血清中的microRNA作为肝癌诊断标志物的应用 |
| CN110291196B (zh) * | 2016-12-14 | 2023-09-12 | 宝生物工程株式会社 | 耐热逆转录酶突变体 |
| US20180312822A1 (en) * | 2017-04-26 | 2018-11-01 | 10X Genomics, Inc. | Mmlv reverse transcriptase variants |
| CN112442493A (zh) * | 2019-08-30 | 2021-03-05 | 广东菲鹏生物有限公司 | 热稳定的逆转录酶 |
| CN112662642B (zh) * | 2019-10-15 | 2022-08-19 | 武汉核圣生物技术有限公司 | 突变型鱼大眼梭鲈皮肤肉瘤病毒逆转录酶及其应用 |
| CN112795550B (zh) * | 2019-11-13 | 2024-05-31 | 广州达安基因股份有限公司 | 耐高温逆转录酶突变体 |
| CN112795546B (zh) * | 2019-11-13 | 2024-02-27 | 广州达安基因股份有限公司 | 一种具有高逆转录效率的耐高温逆转录酶突变体及其应用 |
-
2021
- 2021-06-07 CN CN202110634550.9A patent/CN113355303B/zh active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021153A (zh) * | 1996-10-01 | 2011-04-20 | 杰龙公司 | 人类的端粒酶催化亚单位 |
| CN106164261A (zh) * | 2014-01-22 | 2016-11-23 | 生命技术公司 | 适用于高温核酸合成的新颖逆转录酶 |
| CN110637084A (zh) * | 2017-04-26 | 2019-12-31 | 10X基因组学有限公司 | Mmlv逆转录酶变体 |
Non-Patent Citations (3)
| Title |
|---|
| Expression and processing of proteins encoded by the Saccharomyces retrotransposon Ty5;PA Irwin等;J Virol;全文 * |
| Pr180[Moloney murine leukemia virus];Petropoulos CJ;Genbank Database;Accession No.AAC82568.2 * |
| 含人端粒酶RNA突变体的端粒酶抑制剂筛选模型的构建;曹莹;中国优秀硕士学位论文全文数据库 基础科学辑;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113355303A (zh) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113355303B (zh) | 一种m-mlv逆转录酶突变体及其应用 | |
| CN113785053B (zh) | 酶活性提高的逆转录酶及其应用 | |
| CN114945663B (zh) | 耐高温逆转录酶突变体及其应用 | |
| CN117660400A (zh) | 突变的具有高扩增活性的耐热dna聚合酶 | |
| CN112795550B (zh) | 耐高温逆转录酶突变体 | |
| CN118406670B (zh) | 一种mmlv逆转录酶突变体及其应用 | |
| CN115485374B (zh) | 一种具有高扩增活性的耐热dna聚合酶突变体 | |
| CN119193526A (zh) | 一种末端脱氧核苷酸转移酶突变体及其应用 | |
| CN114836411A (zh) | 基于crispr技术的靶基因捕获的方法 | |
| CN116286723A (zh) | 一种基于蛋白定向进化的快速逆转录酶及其应用 | |
| JP7660563B2 (ja) | 改善された熱安定性ウイルス逆転写酵素 | |
| CN112251423B (zh) | 一种m-mlv逆转录酶体及其应用 | |
| CN116875582B (zh) | 一种核苷水解酶突变体、基因、表达载体、细胞及其应用 | |
| CN115011578B (zh) | 一种强化型m-mlv逆转录酶突变体及其应用 | |
| CN116178563B (zh) | 一种dna合成纠错酶及应用 | |
| WO2025118254A1 (zh) | 逆转录酶及其应用 | |
| CN119614534A (zh) | 一种mmlv逆转录酶突变体、制备方法及应用 | |
| CN118006581A (zh) | 具有XNA识别及合成活性的Pfu DNA聚合酶突变株及其应用 | |
| CN119193530A (zh) | 一种突变重组逆转录酶及其制备方法和应用 | |
| CN119082074A (zh) | 一种逆转录酶突变体及其制备方法和应用 | |
| CN118726304A (zh) | 一种真核DNA聚合酶δ突变体及制备方法和应用 | |
| KR100774102B1 (ko) | 썰포포보코커스 질리지 유래의 내열성 ｄｎａ 연결효소 | |
| CN117186240A (zh) | 一种M-MuLV逆转录酶的融合蛋白及突变体及其制备方法和应用 | |
| CN119592539A (zh) | 一种兼具高DNA聚合酶活性与逆转录酶活性的重组Bst DNA聚合酶及其制备与应用 | |
| CN117964713A (zh) | 一种t4gp32蛋白突变体及其应用 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 400037 1st-4th floor, building 30, No.6 Taikang Road, Zone C, Jianqiao Industrial Park, Dadukou District, Chongqing Applicant after: Zhongyuan Huiji Biotechnology Co.,Ltd. Address before: 400037 1st-4th floor, building 30, No.6 Taikang Road, Zone C, Jianqiao Industrial Park, Dadukou District, Chongqing Applicant before: CHONGQING ZHONGYUAN HUIJI BIOTECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240704 Address after: Room 101, Building 16, No. 518 Shenzhuan Road, Xinqiao Town, Songjiang District, Shanghai, 201600 Patentee after: Shanghai Huiji Biotechnology Co.,Ltd. Country or region after: China Address before: 400037 1st-4th floor, building 30, No.6 Taikang Road, Zone C, Jianqiao Industrial Park, Dadukou District, Chongqing Patentee before: Zhongyuan Huiji Biotechnology Co.,Ltd. Country or region before: China |