JP5354559B2 - 高効率分泌シグナルペプチド及びそれらを利用したタンパク質発現系 - Google Patents
高効率分泌シグナルペプチド及びそれらを利用したタンパク質発現系 Download PDFInfo
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Description
(a)配列番号2、4、6、8、10、12、14、16及び18のいずれか1記載のアミノ酸配列から成る分泌シグナルペプチド
(b)上記(a)の分泌シグナルペプチドのアミノ酸配列において、1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列から成り、且つ30℃において分泌シグナル活性を有する分泌シグナルペプチド
(2)上記DNAが以下の(a)〜(c)のいずれか1記載の分泌シグナルペプチドをコードするDNAである、(1)記載のDNA。
(a)配列番号1、3、5、7、9、11、13、15及び17のいずれか1記載の塩基配列から成るDNA
(b)上記(a)のDNAにおいて、1又は複数の塩基が欠失、置換又は付加された塩基配列から成り、30℃において分泌シグナル活性を有する分泌シグナルペプチドをコードするDNA
(c)上記(a)のDNAと相補的な塩基配列から成るDNAとストリンジェントな条件下でハイブリダイズし、且つ30℃において分泌シグナル活性を有する分泌シグナルペプチドをコードするDNA
(3)(1)又は(2)記載のDNAによりコードされる分泌シグナルペプチド。
(4)(1)又は(2)記載のDNAと外来遺伝子とを含むことを特徴とする発現ベクター。
(5)(4)記載の発現ベクターによって形質転換された形質転換体。
(6)宿主が酵母であることを特徴とする、(5)記載の形質転換体。
(7)上記酵母がサッカロミセス・セレビシエであることを特徴とする、(6)記載の形質転換体。
(8)(5)〜(7)のいずれか1記載の形質転換体を20℃〜42℃で培養することを特徴とするタンパク質の製造方法。
(9)以下の(a)又は(b)のいずれか1記載の分泌シグナルペプチドをコードするDNA。
(a)配列番号2、4、6、8、10、12、14、16、18、20、22、24、26、28、30、32、34、36、38、40、42、44、46、48、50、52、54、56、58、60、62、64、66、68、70、72、74、76、78、80、82、84、86、88、90、92、94、96、98、100及び102のいずれか1記載のアミノ酸配列から成る分泌シグナルペプチド
(b)上記(a)の分泌シグナルペプチドのアミノ酸配列において、1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列から成り、且つ15℃において分泌シグナル活性を有する分泌シグナルペプチド
(10)上記DNAが以下の(a)〜(c)のいずれか1記載の分泌シグナルペプチドをコードするDNAである、(9)記載のDNA。
(a)配列番号1、3、5、7、9、11、13、15、17、19、21、23、25、27、29、31、33、35、37、39、41、43、45、47、49、51、53、55、57、59、61、63、65、67、69、71、73、75、77、79、81、83、85、87、89、91、93、95、97、99及び101のいずれか1記載の塩基配列から成るDNA
(b)上記(a)のDNAにおいて、1又は複数の塩基が欠失、置換又は付加された塩基配列から成り、15℃において分泌シグナル活性を有する分泌シグナルペプチドをコードするDNA
(c)上記(a)のDNAと相補的な塩基配列から成るDNAとストリンジェントな条件下でハイブリダイズし、且つ15℃において分泌シグナル活性を有する分泌シグナルペプチドをコードするDNA
(11)(9)又は(10)記載のDNAによりコードされる分泌シグナルペプチド。
(12)(9)又は(10)記載のDNAと外来遺伝子とを含むことを特徴とする発現ベクター。
(13)(12)記載の発現ベクターによって形質転換された形質転換体。
(14)宿主が酵母であることを特徴とする、(13)記載の形質転換体。
(15)上記酵母がサッカロミセス・セレビシエであることを特徴とする、(14)記載の形質転換体。
(16)(13)〜(15)のいずれか1記載の形質転換体を0℃〜20℃で培養することを特徴とするタンパク質の製造方法。
成熟型CLucをコードする遺伝子をレポーター遺伝子として用いたレポーターベクターpCLuRA-sを以下の方法で作製した。
pUG35(http://mips.gsf.de/proj/yeast/info/tools/hegemann/gfp.html)から作製したpUG35-MET25-EGFP3+MCSプラスミド(国際出願第PCT/JP2006/311597号(特願2005-169768号を優先権の基礎とする)参照)をHindIIIとXbaIとで切断し、アガロース電気泳動によるDNA断片の分画を行い、約5.1kbpのベクター断片を回収した。以下では、このベクター断片をDNA断片Aと呼ぶ。
cLuc ORF -Sig R +XbaI: GCGC-TCTAGA-CTATTTGCATTCATCTGGTACTTC(配列番号106)
-610-HSP12 IGR R +BamHI: CG-GGATCC-TGTTGTATTTAGTTTTTTTTGTTTTGAG(配列番号109)
出芽酵母サッカロミセス・セレビシエ由来の膜タンパク質及び分泌タンパク質に存在する分泌シグナルペプチドの抽出を以下の方法によって行った。
MF(ALPHA)1 Sig. R: gacagtcctg-AGCTTCAGCCTCTCTTTTCT(配列番号1773)
低温誘導発現ベクターである上述したベクターpLTex321s(特許文献2参照)をXhoIとSphIで切断し、アガロース電気泳動によるDNA断片の分画を行い、約7.3kbpのベクター断片を回収した。以下では、このベクター断片をDNA断片Gと呼ぶ。
V5-H tag R: CTCAATGGTGATGGTGATGATGACCGGTACGCGTAGAATCGAGACCGAGGAGAGGGTTAGGGATAGGCTTACCC(配列番号1775)
K28 PPT Sig. R: GGAATTCCTGCAGCCCGGGCAAATTAGAAACAGACAACAAAGCCAAAACCAAAGATTTATAATTAACCAT(配列番号1777)
K28 Sig. R (36): GGAATTCCTGCAGCCCGGG-ACCTCTAGCATATTT-CAAATTAGAAACAGACAACAAAGCC(配列番号1779)
K28L Sig. R: gacagtcctg-ACCTCTAGCATATTTCAAAT(配列番号1781)
2nd PCR R: CAGGAAGTTGGAACTGTGTTTGGTGGATCAGGTTCGTAAG-GACAGTCCTG(配列番号1783)
実施例2において得られた各2nd PCR産物及び実施例1において作製したレポーターベクターpCLuRA-sを用いて、サッカロミセス・セレビシエを宿主とした分泌シグナルペプチドライブラリーの構築を以下のように行った。
dPEP4 kan R: GGCAGAAAAGGATAGGGCGGAGAAGTAAGAAAAGTTTAGC-GCATAGGCCACTAGTGGATCTG(配列番号1785)
dPRB1 kan R: AAGAAAAAAAAAAGCAGCTGAAATTTTTCTAAATGAAGAA-GCATAGGCCACTAGTGGATCTG(配列番号1787)
実施例3において構築されたサッカロミセス・セレビシエを宿主とした分泌シグナルペプチドライブラリーを用いて、各分泌シグナルペプチドの分泌能力を、成熟型CLuc(分泌型ルシフェラーゼ)を使用して、以下のように評価した。
上記本培養液20μlに2.5μMルシフェリン溶液80μlを加えた後、2秒後に5秒間の発光量測定を行った。また、同時に、各本培養液200μlを用いて、600nmにおける各本培養液の吸光度の測定を行い、本測定値で発光量を除算することで、吸光度によるルシフェラーゼ活性値のノーマライゼーションを行った。
実施例4では、分泌シグナルペプチドの分泌能力を、分泌型ルシフェラーゼ(成熟型CLuc)について評価した。本実施例では、分泌シグナルペプチドの他のタンパク質の分泌発現における有効性を検討するため、表3に示された分泌シグナルペプチド中、下記の表6に示す16種類の分泌シグナルペプチドの分泌能力を、簡便な活性測定方法が確立されている分泌タンパク質であるヒト膵臓α-アミラーゼ(cDNA:配列番号1788、アミノ酸配列:配列番号1789)について評価した。なお、宿主としては、サッカロミセス・セレビシエを用いた。
hAMY2A ORF R +XhoI: GCGC-CTCGAG-TTACAATTTAGATTCAGCATGAATTGC(配列番号1823)
MF(ALPHA)1 Sig. 89aa R +SmaI: GGG-AGCTTCAGCCTCTCTTTTCTCG(配列番号1826)
Claims (5)
- 以下の(a)若しくは(b)のいずれか1記載の分泌シグナルペプチドを含むペプチドをコードするDNA又は以下の(c)〜(e)のいずれか1記載の分泌シグナルペプチドを含むペプチドをコードするDNAと外来遺伝子とを含む酵母用分泌性発現ベクターであって、該ペプチドが15℃において分泌シグナル活性を有し、α-因子由来分泌シグナルペプチドと比較して2倍を超える分泌能力を有するものであり、
該酵母用分泌性発現ベクターは、低温誘導性プロモーターを含み、前記分泌シグナルペプチドを含むペプチドにより前記外来遺伝子によりコードされるタンパク質を、0℃〜20℃の培養条件下において細胞外に分泌生産するためか、又は0℃〜20℃の培養条件下において細胞壁、細胞膜、小胞体及びゴルジ体から成る群より選択される細胞内小器官へ輸送発現するために用いる酵母形質転換体の製造用発現ベクターである、
前記酵母用分泌性発現ベクター。
(a)配列番号2、4、6、8、10、12、14、16、18、20、22、24、26、28、30、32、34、36、38、40、42、44、46、48、50、52、54、56、58、60、62、64、66、68、70、72、74、76、78、80、82、84、86、88、90、92、94、96、98、100及び102のいずれか1記載のアミノ酸配列から成る分泌シグナルペプチドを含むペプチド
(b)上記(a)の分泌シグナルペプチドを含むペプチドのアミノ酸配列において、1又は数個のアミノ酸が欠失、置換又は付加されたアミノ酸配列から成り、且つ15℃において分泌シグナル活性を有する分泌シグナルペプチドを含むペプチド
(c)配列番号1、3、5、7、9、11、13、15、17、19、21、23、25、27、29、31、33、35、37、39、41、43、45、47、49、51、53、55、57、59、61、63、65、67、69、71、73、75、77、79、81、83、85、87、89、91、93、95、97、99及び101のいずれか1記載の塩基配列から成るDNA
(d)上記(c)のDNAにおいて、1又は複数の塩基が欠失、置換又は付加された塩基配列から成り、15℃において分泌シグナル活性を有する分泌シグナルペプチドを含むペプチドをコードするDNA
(e)上記(c)のDNAと相補的な塩基配列から成るDNAとストリンジェントな条件下でハイブリダイズし、且つ15℃において分泌シグナル活性を有する分泌シグナルペプチドを含むペプチドをコードするDNA - 前記分泌シグナルペプチドを含むペプチドがサッカロミセス・セレビシエに由来するものである、請求項1記載の酵母用分泌性発現ベクター。
- 請求項1又は2記載の酵母用分泌性発現ベクターによって形質転換された低温分泌生産用酵母形質転換体であって、前記分泌シグナルペプチドを含むペプチドにより前記外来遺伝子によりコードされるタンパク質を、0℃〜20℃の培養条件下において細胞外に分泌生産するためか、又は0℃〜20℃の培養条件下において細胞壁、細胞膜、小胞体及びゴルジ体から成る群より選択される細胞内小器官へ輸送発現するために用いる、前記酵母形質転換体。
- 上記酵母がサッカロミセス・セレビシエである、請求項3記載の酵母形質転換体。
- 請求項3又は4記載の酵母形質転換体を0℃〜20℃で培養することにより、前記外来遺伝子によりコードされるタンパク質を、前記分泌シグナルペプチドを含むペプチドにより細胞外に分泌させるか、又は前記酵母形質転換体を0℃〜20℃で培養することにより、前記外来遺伝子によりコードされるタンパク質を、前記分泌シグナルペプチドを含むペプチドにより細胞壁、細胞膜、小胞体及びゴルジ体から成る群より選択される細胞内小器官へ輸送発現させる工程を含む、タンパク質の製造方法。
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