CN100529081C - 编码1ysR2基因的核苷酸序列 - Google Patents
编码1ysR2基因的核苷酸序列 Download PDFInfo
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- CN100529081C CN100529081C CNB018139868A CN01813986A CN100529081C CN 100529081 C CN100529081 C CN 100529081C CN B018139868 A CNB018139868 A CN B018139868A CN 01813986 A CN01813986 A CN 01813986A CN 100529081 C CN100529081 C CN 100529081C
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Abstract
本发明涉及一种分离的多核苷酸,其包含选自如下一组的一种多核苷酸序列:a)与编码包含SEQ ID NO:2的氨基酸序列的多肽的多核苷酸至少70%相同的多核苷酸,b)编码包含与SEQ ID NO:2的氨基酸序列至少70%相同的氨基酸序列的多肽的多核苷酸,c)与a)或b)的多核苷酸互补的多核苷酸,以及d)包含a),b)或c)的多核苷酸序列的至少15个连续碱基的多核苷酸。本发明还涉及使用棒状细菌发酵生产L-氨基酸的方法,所述细菌中至少lysR2基因以弱化形式存在,本发明还涉及所述多核苷酸序列作为杂交探针的应用。
Description
本发明提供了来自棒状细菌(coryneform bacteria)的编码lysR2基因的核苷酸序列,和通过弱化lysR2基因发酵生产氨基酸尤其L-赖氨酸和L-缬氨酸的方法。lysR2基因编码LysR2蛋白,其是LysR家族的一种转录调节物。
现有技术
L-氨基酸特别是L-赖氨酸和L-缬氨酸用于人用药物和制药工业,食品工业,特别是动物营养。
已知氨基酸可通过棒状细菌菌株,尤其谷氨酸棒杆菌的发酵而生产。由于其极其重要性,已持续进行改良生产方法的尝试。生产方法的改良可涉及发酵措施,如搅拌和供氧,或营养培养基的组成如发酵期间的糖浓度,或例如通过离子交换层析对产物形式的加工方法,或微生物本身的固有生产性质。
为改良这些微生物的生产性质,可使用诱变,选择及突变体选择等方法,以此方法可获得对抗代谢物有抗性或重要的调节代谢物缺陷的并产生氨基酸的菌株。
一段时间以来,重组DNA技术的方法也用于改良棒杆菌菌株生产L-氨基酸的能力。
发明目的
本发明人的目的是为发酵生产氨基酸,尤其L-赖氨酸和L-缬氨酸提供改良的新方法。
发明描述
本发明提供了来自棒状细菌的分离的多核苷酸,其包含编码lysR2基因的多核苷酸序列,所述多核苷酸选自:
a)与编码包含SEQ ID NO:2氨基酸序列的多肽的多核苷酸至少70%相同的多核苷酸,
b)编码包含与SEQ ID NO:2氨基酸序列至少70%相同的氨基酸序列的多肽的多核苷酸,
c)与a)或b)多核苷酸互补的多核苷酸,及
d)包含a),b)或c)多核苷酸序列的至少15个连续核苷酸的多核苷酸,
所述多肽优选具有转录调节物LysR2活性。
本发明还提供了上述多核苷酸,其优选是一种能复制的DNA,包含:
(i)SEQ ID NO:1所示核苷酸序列,或
(ii)在遗传密码简并范围内相应于(i)序列的至少一个序列,或
(iii)与(i)或(ii)序列的互补序列杂交的至少一个序列,及任选地,
(iv)(i)中中性功能的有义突变,其不改变所述蛋白质/多肽的活性。
本发明还提供了:
a)多核苷酸,其包含选自SEQ ID NO:1所示核苷酸序列的第1-231位的至少15个连续核苷酸,
b)多核苷酸,其包含选自SEQ ID NO:1所示核苷酸序列的第232-1161位的至少15个连续核苷酸,
c)多核苷酸,其包含选自SEQ ID NO:1所示核苷酸序列的第1162-1364位的至少15个连续核苷酸。
本发明还提供了:
一种DNA,其是能复制的并包含SEQ ID NO:1所示核苷酸序列;
一种多核苷酸,其编码包含SEQ ID NO:2所示氨基酸序列的多肽;
一种载体,其含有本发明的多核苷酸的部分,至少是所述序列的15个连续核苷酸;及
棒状细菌,其中lysR2基因尤其是通过插入或缺失而弱化。
本发明还提供了多核苷酸,其基本上包含一种多核苷酸序列,所述多核苷酸可通过用具有相应于SEQ ID NO:1所述多核苷酸或其片段的序列的探针杂交合适的基因文库,并分离所述的DNA序列来筛选获得,所述的文库包括具有相应于SEQ ID NO:1所述多核苷酸序列的完整基因。
本发明的多核苷酸序列适用作RNA、cDNA和DNA的杂交探针,以分离编码LysR2蛋白的全长核酸或多核苷酸或基因,或分离与lysR2基因的序列具有高度序列相似性的核酸、多核苷酸或基因。它们也适于掺入所谓的“阵列”,“微阵列”或“DNA芯片”中,以检测和确定相应的多核苷酸。
另外,含有本发明序列的多核苷酸还适用作引物,借助于其通过聚合酶链反应(PCR),可以制备编码LysR2蛋白的基因的DNA。
作为探针或引物的这种寡核苷酸包含至少25,26,27,28,29或30个、优选至少20,21,22,23或24个、特别优选至少15,16,17,18或19个连续核苷酸。长度至少为31,32,33,34,35,36,37,38,39或40个,或至少41,42,43,44,45,46,47,48,49或50个核苷酸的寡核苷酸也是合适的。具有至少100,150,200,250或300个核苷酸的寡核苷酸也任选是适当的。
“分离的”是指从其天然环境中分离出来。
“多核苷酸”一般地涉及多聚核糖核苷酸和多聚脱氧核糖核苷酸,其可以是非修饰的RNA或DNA,或修饰的RNA或DNA。
本发明的多核苷酸包括SEQ ID NO:1所示多核苷酸或从中制备的片段,或者与SEQ ID NO:1所示多核苷酸具有至少70-80%,优选至少81%-85%,特别优选具有至少86%-90%,及非常优选至少91%,93%,95%,97%或99%相同性的那些多核苷酸,或从中制备的片段。
“多肽”应理解为包含经肽键结合的两个或多个氨基酸的肽或蛋白质。
本发明的多肽包括SEQ ID NO:2的多肽,特别是具有LysR2蛋白生物学活性的多肽,以及与SEQ ID NO:2的多肽至少70-80%,优选至少81-85%,特别优选至少86-90%,及非常优选至少91%,93%,95%,97%或99%相同并具有所述活性的多肽。
本发明另外还提供了用尤其已生产氨基酸的棒状细菌发酵生产氨基酸的方法,在该棒状细菌中编码lysR2基因的核苷酸序列被弱化,尤其是被消除或低水平表达,所述生产的氨基酸选自L-天冬酰胺,L-苏氨酸,L-丝氨酸,L-谷氨酸,L-甘氨酸,L-丙氨酸,L-半胱氨酸,L-缬氨酸,L-甲硫氨酸,L-异亮氨酸,L-亮氨酸,L-酪氨酸,L-苯丙氨酸,L-组氨酸,L-赖氨酸,L-色氨酸,L-精氨酸,尤其是L-赖氨酸和L-缬氨酸。
文中术语“弱化”是指微生物中由相应DNA编码的一或多种酶(蛋白质)的胞内活性的降低或消除,例如通过使用弱启动子或编码低活性相应酶的基因或等位基因,或失活相应基因或酶(蛋白质),及如果需要组合使用这些方法。
本发明的微生物可从葡萄糖、蔗糖、乳糖、果糖、麦芽糖、糖蜜、淀粉、纤维素或从甘油和乙醇中生产氨基酸特别是L-赖氨酸和L-缬氨酸。所述微生物可以是棒状细菌的代表菌,尤其是棒杆菌属。在棒杆菌属中尤其应提及的是谷氨酸棒杆菌,本领域技术人员已知其生产L-氨基酸的能力。
适当的棒杆菌属,尤其谷氨酸棒杆菌菌株,是例如已知的野生型菌株:
谷氨酸棒杆菌ATCC 13032
醋谷棒杆菌ATCC 15806
嗜乙酰乙酸棒杆菌ATCC 13870
Corynebacterium melassecola ATCC 17965
嗜热产氨棒杆菌FERM BP-1539
黄色短杆菌ATCC 14067
乳发酵短杆菌ATCC 13869和
扩展短杆菌ATCC 14020
或从中获得的生产L-氨基酸的突变体或菌株,例如生产L-赖氨酸的菌株:
谷氨酸棒杆菌FERM-P 1709
黄色短杆菌FERM-P1708
乳发酵短杆菌FERM-P 1712
谷氨酸棒杆菌FERM-P 6463
谷氨酸棒杆菌FERM-P 6464
谷氨酸棒杆菌DM58-1
谷氨酸棒杆菌DG52-5
谷氨酸棒杆菌DSM 5715和
谷氨酸棒杆菌DSM 12866
或例如生产L-缬氨酸的菌株:
谷氨酸棒杆菌DSM 12455
谷氨酸棒杆菌FERM-P 9325
乳发酵短杆菌FERM-P 9324
乳发酵短杆菌FERM-BP 1763。
本发明人已成功地从谷氨酸棒杆菌中分离编码LysR2蛋白的新lysR2基因,该蛋白是LysR家族的一种转录调节物。
为了分离谷氨酸棒杆菌的lysR2基因或其他基因,首先在大肠杆菌中建立这一微生物的基因文库。可根据通常已知的教材和手册建立基因文库。例如由Winnacker所著教材:基因与克隆,基因工程入门(Verlag Chamie,Weinheim,德国,1990),或由Sambrook等所著手册:分子克隆实验手册(Cold Spring Harbor Laboratory Press,1989)。一非常熟知的基因文库是已由Kohara等(细胞50,495-508(1987))在λ载体中建立的E.coli K-12菌株W3110的基因文库。Bathe等(分子及普通遗传学,252:255-265,1996)阐述了借助于粘粒载体SuperCos I(Wahl等,1987,Proceeding of the NationalAcademy of Sciences USA,84:2160-2164),在E.coli K-12菌株NM554(Raleigh等,1988,核酸研究16:1563-1575)中建立的谷氨酸棒杆菌ATCC 13032的基因文库。Bormann等(分子微生物学6(3),317-326)描述了用粘粒pHC79(Hohn和Collins,基因11,291-298(1980))制备谷氨酸棒杆菌ATCC13032的基因文库。
为在大肠杆菌中制备谷氨酸棒杆菌的基因文库,也可使用质粒如pBR322(Bolivar,生命科学25,807-818(1979))或pUC9(Viera等,1982,基因19:259-268)。合适的宿主尤其是限制和重组缺陷的大肠杆菌菌株,一个例子是菌株DH5α(Jeffrey H.Miller:“细菌遗传学短期教材,针对大肠杆菌和相关细菌的实验指导和手册”,冷泉港实验室出版社,1992)。
然后将借助于粘粒或其它λ载体克隆的长DNA片段,亚克隆入适于DNA测序的常规载体中。
DNA测序方法参见于Sanger等(美国科学院院报74:5463-5467,1977)所述。
获得的DNA序列然后可以使用已知公式或序列分析程序加以检测,如Staden(核酸研究14,217-232(1986))所述,Marck(核酸研究16,1829-1836(1988))所述,或Butler所述GCG程序(生物化学分析方法39,74-97(1998))。
以此方式可获得编码lysR2基因的谷氨酸棒杆菌的新DNA序列,示作SEQ ID NO:1,是本发明的一部分。另外,用前述方法从此DNA序列中也已衍生出相应蛋白质的氨基酸序列。所得lysR2基因产物的氨基酸序列以SEQ ID NO:2表示。已知宿主中内源性酶可以断裂所形成的蛋白质的N末端甲硫氨酸或甲酰甲硫氨酸。
通过遗传密码的简并性产生自SEQ ID NO:1的编码DNA序列也是本发明的一部分。同样,与SEQ ID NO:1或SEQ ID NO:1的部分杂交的DNA序列也是本发明的一部分。另外,本领域技术人员已知,蛋白质中的保守氨基酸置换如用丙氨酸置换甘氨酸,或用谷氨酸置换天冬氨酸,是有义突变,其不引起所述蛋白质活性的任何改变,即它们是中性的。另外,已知在蛋白质N末端和/C末端的变化基本不损害其功能而且甚至还稳定其功能。本领域技术人员可以找到关于这方面的信息,参见Ben-Bassat等(细菌学杂志169:751-757(1987)),O’Regan等(基因77:237-251(1989)),Sahin-Toth等(蛋白质科学3:240-247(1994)),Hochuli等(生物/技术6:1321-1325(1988))及熟知的遗传和分子生物学教材。以适当方式产生自SEQ ID NO:2的氨基酸序列也是本发明的一部分。
最后,使用得自SEQ ID NO:1的引物通过聚合酶链反应(PCR)产生的DNA序列是本发明的一部分。这种寡核苷酸典型地具有至少15个核苷酸。
通过杂交鉴别DNA序列的指导可见于Boehringer MannheimGmbH(德国曼海姆,1993)的“滤膜杂交的DIG系统使用指导”,和Liebl等(国际系统细菌学杂志41:255-260(1991))。用聚合酶链反应(PCR)扩增DNA序列的指导参见Gait的手册:寡核苷酸合成实用方法(IRL出版社,英国牛津,1984)及Newton和Graham:PCR(Spektrum Akademischer Verlag,Heidelberg,德国,1994)。
本发明人发现,在lysR2基因弱化后,棒状细菌以改良方式生产氨基酸,尤其L-赖氨酸和L-缬氨酸。
为获得弱化,可降低或消除lysR2基因的表达或酶蛋白的催化活性。两种措施可任选地组合。
可通过适当控制培养或通过遗传修饰(突变)用于基因表达的信号结构而实现降低基因表达。用于基因表达的信号结构例如是阻遏基因、激活基因、操纵子、启动子、弱化子、核糖体结合位点、起始密码子和终止子。本领域技术人员可在如下文献中发现此方面的信息,例如专利申请WO96/15246,Boyd & Murphy(细菌学杂志170:5949(1988)),Voskuil & Chambliss(核酸研究26:3548(1998)),Jensen & Hammer(生物技术和生物工程58:191(1998)),Patek等(微生物学142:1297(1996)),Vasicova等(细菌学杂志181:6188(1999)),以及已知的遗传学和分子生物学教科书如Knippers的教科书(分子遗传学,第6版,Georg Thieme Verlag,德国斯图加特,1995),或Winnacker的教科书(基因和克隆,VCH Verlagsgesellschaft,Weinheim,德国,1990)。
导致酶蛋白催化活性的变化或降低的突变是现有技术中已知的,可提及的例如Qiu和Goodman的工作(生物化学杂志272:8611-8617(1997)),Sugimoto等(生物科学生物技术和生物化学61:1760-1762(1997))以及Mockel(谷氨酸棒杆菌的苏氨酸脱水酶:酶的变构调节和结构,Berichte des Forschungszentrums Julichs,Jul-2906,ISSN09442952,Julich,德国,1994)。综述可参见遗传学和分子生物学的已知教科书,如Hagemann的教科书(″Allgemeine Genetik″,Gustav Fischer Verlag,Stuttgart,1986)。
合适的突变是转换、颠换、插入和缺失。根据氨基酸置换对酶活性的影响,分别为错义突变或无义突变。在基因中插入或缺失至少一个碱基对(bp)导致移码突变,其结果是插入不正确的氨基酸或者翻译过早终止。缺失几个密码子典型地导致酶活性的完全丧失。产生此类突变的指导属于现有技术并可在遗传学和分子生物学的已知教科书中找到,如Knippers的教科书(分子遗传学,第6版,GeorgThieme Verlag,德国斯图加特,1995),Winnacker的教科书(基因和克隆,VCH Verlagsgesellschaft,Weinheim,德国,1990)或Hagemann的教科书(″普通遗传学″,Gustav Fischer Verlag,Stuttgart,1986)。
在谷氨酸棒杆菌中突变基因的一般方法是基因破坏和基因置换方法,如Schwarzer和Puhler所述(生物/技术9,84-87(1991))。
在基因破坏方法中,将所述基因编码区的中心部分克隆在质粒载体中,所述载体能在宿主中复制(典型在大肠杆菌中复制),但在谷氨酸棒杆菌中不能复制。适当的载体例如pSUP301(Simon等,生物/技术1,784-791(1983)),pK18mob或pK19mob(Schafer等,基因145,69-73(1994)),pK18mobsacB或pK19mobsacB(Jager等,细菌学杂志174:5462-65(1992)),pGEM-T(Promega公司,Madison,Wis.,美国),pCR2.1-TOPO(Shuman(1994)),生物化学杂志269:32678-84;美国专利No.5487993),Blunt(Invitrogen,Groningen,Netherlands;Bernard等,分子生物学杂志234:534-541(1993))或pEM1(Schrumpf等,1991,细菌学杂志173:4510-4516)。然后将含有所述基因编码区中心部分的质粒载体通过接合或转化移至所需谷氨酸棒杆菌菌株中。接合方法例如Schafer等(应用和环境微生物学60,756-759(1994))所述。转化方法例如Thierbach等(应用微生物学及生物技术学29,356-362(1988)),Dunican和Shivnan(生物/技术7,1067-1070(1989))及Tauch等(FEMS微生物学通信123,343-347(1994))所述。在通过“交换”同源重组后,相应基因的编码区被载体序列间断,并获得两个不完整的等位基因,一个缺失3’末端,一个缺失5’末端。这个方法例如已经由Fitzpatrick等使用,以消除谷氨酸棒杆菌中的recA基因(应用微生物学和生物技术42,575-580(1994))。
图1示出质粒载体pCR2.1lysR2int,利用其可破坏或消除lysR2基因。
在基因置换方法中,突变例如缺失,插入或碱基置换是在体外在相应基因中产生的。然后将产生的等位基因克隆入在谷氨酸棒杆菌中不复制的载体中,接着将其通过转化或接合移至所需谷氨酸棒杆菌宿主中。在通过实现整合的第一次“交换”事件,及实现靶基因或靶序列中的切除的第二次“交换”事件的同源重组后,实现掺入突变体或等位基因。这种方法例如已经由Peters-Wendisch等使用,以通过缺失而消除谷氨酸棒杆菌中的pyc基因(微生物学144,915-927(1998))。
以此方式可以在lysR2基因中掺入缺失,插入或碱基置换。
另外,除了lysR2基因的弱化之外,特定生物合成途径、糖酵解、回补代谢、柠檬酸循环或氨基酸输出的一或多种酶的增强特别是过表达,对L-氨基酸尤其L-赖氨酸和L-缬氨酸的生产也可以是有益的。
术语“增强”是指微生物中由相应的DNA编码的-或多种酶的胞内活性的提高,例如通过提高基因的拷贝数,或用强启动子或编码高活性相应酶(蛋白质)的基因,及任选地组合使用这些方法。
因此,例如为生产L-赖氨酸,选自以下的一或多种基因可以同时增强尤其过表达:
·编码二氢-2,6-吡啶二羧酸合酶的dapA基因(EP-B-0197335),
·编码烯醇化酶的eno基因(DE:19947791.4),
·编码zwf基因产物的zwf基因(JP-A-09224661),
·编码丙酮酸羧化酶的pyc基因(Peters-Wendisch等,微生物学144,915-927(1998)),
·编码赖氨酸输出的lysE基因(DE-A-19548222),
·编码反馈抗性天冬氨酸激酶的lysC基因(EP-B-0387527;EP-A-0699759),
·编码Zwa1蛋白的zwa1基因(19959328.0,DSM13115)。
因此,例如为生产L-缬氨酸,选自以下的一或多种基因或等位基因可以同时增强、尤其过表达:
·编码乙酰羟酸合酶的ilvBN基因(Keilhauer等,(1993),细菌学杂志175:5595-5603),或
·编码二羟酸脱水酶的ilvD基因(Sahm和Eggeling(1999),应用和环境微生物学65:1973-1979),或
·编码苹果酸:醌氧化还原酶的mqo基因(Molenaar等,欧洲生物化学杂志254,395-403(1998))。
为生产氨基酸尤其L-赖氨酸,除了弱化lysR2基因之外,同时弱化选自以下的一或多种基因也是有益的:
·编码磷酸烯醇丙酮酸羧激酶的pck基因(DE19950409.1,DSM13047),
·编码编码葡糖-6-磷酸异构酶的pgi基因(US09/396478,DSM12969),
·编码丙酮酸氧化酶的poxB基因(DE:19951975.7,DSM13114),
·编码Zwa2蛋白的zwa2基因(DE:19959327.2,DSM13113)。
最后,为生产氨基尤其L-赖氨酸,除了弱化lysR2基因之外,同时弱化尤其消除选自以下的一或多种基因的表达也是有益的:
·编码高丝氨酸脱氢酶的hom基因(EP-A-0131171),
·编码高丝氨酸激酶的thrB基因(Peoples,O.W.等,分子微生物学2(1988):63-72),
·编码天冬氨酸脱羧酶的panD基因(EP-A-1006192)。
弱化高丝氨酸脱氢酶也可以通过氨基酸置换实现,例如将酶蛋白第59位的L-缬氨酸置换为L-丙氨酸,L-甘氨酸或L-亮氨酸,将酶蛋白第104位的L-缬氨酸置换为L-异亮氨酸,L-缬氨酸或L-亮氨酸,和/或酶蛋白的第118位L-天冬酰胺置换为L-苏氨酸或L-丝氨酸。
弱化高丝氨酸激酶也可以通过氨基酸置换实现,例如将酶蛋白第133位的L-丙氨酸置换为L-缬氨酸,L-甘氨酸或L-亮氨酸,和/或将酶蛋白第138位的L-脯氨酸置换为L-苏氨酸,L-异亮氨酸或L-丝氨酸。
弱化天冬氨酸脱羧酶也可以通过氨基酸置换实现,例如将酶蛋白第36位的L-丙氨酸置换为L-甘氨酸,L-缬氨酸或L-异亮氨酸。
另外,除lysR2基因的弱化之外,抑制非所需的二级反应对氨基酸尤其L-赖氨酸和L-缬氨酸的生产也是有益的(Nakayama:“生产氨基酸的微生物的育种”,微生物产物的过量产生,Krumphanzl,Sikyta,Vanek(编辑),学术出版社,伦敦,英国,1982)。
本发明还提供了根据本发明制备的微生物,其可连续培养或在分批方法,或在补料分批法或重复补料分批法中分批培养以生产L-氨基酸尤其L-赖氨酸和L-缬氨酸。已知的培养法由Chmiel(生物方法技术学1,生物工程入门,Gustav Fischer Verlag,Stuttgart,1991)所著教材,或由Storhas(生物反应器及外周设备,Vieweg Verlag,Brunswick/Wieshaden,1994)所著教材中所述。
所用培养基必须以适当方式符合特定菌株的需求,关于各种微生物培养基的阐述见于,美国细菌学会的“细菌学通用方法手册”(华盛顿D.C.,USA,1981)。可使用的碳源包括糖及碳水化合物,例如葡萄糖,蔗糖,乳糖,果糖,麦芽糖,糖蜜,淀粉和纤维素,油和脂肪如豆油,葵花油,落花生油和椰子油,脂肪酸如棕榈酸,硬脂酸和亚油酸,醇如甘油和乙醇,及有机酸如乙酸,这些物质可单独或混合使用。
可使用的氮源包括含氮的有机化合物如胨,酵母提取物,肉膏,麦芽提取物,玉米浸液、大豆粉和尿素,或无机化合物如硫酸铵,氯化铵,磷酸铵,碳酸铵和硝酸铵。这些氮源可单独或混合使用。
可使用的磷源包括磷酸,磷酸二氢钾或磷酸氢二钾,或相应钠盐。另外培养基还必须含有为生长所需的金属盐如硫酸镁或硫酸铁。最后,除了上述物质之外,可使用生长必需物质如氨基酸和维生素,此外,可将适当前体加入培养基中。上述物质可以单批形式或在培养期间以适当方式加入培养物中。
可以适当方式加入碱性化合物如NaOH,KOH,氨或氨水,或酸性化合物如磷酸或硫酸,以调节培养物的pH值,抗泡沫剂例如脂肪酸聚乙二醇酯可用于控制泡沫产生。适当的选择性作用物质例如抗生素,可加入培养基中以保持质粒的稳定性。氧气或含氧混合气,例如空气,可充入培养物中以保持有氧条件。培养温度通常在20℃~45℃,优选25℃~40℃,持续培养直至所需产物形成最大量。此目的通常在10~160小时范围达到。
L-氨基酸的分析方法是现有技术中已知的,分析可如Speckman等(分析化学,30,(1958),1190)所述通过阴离子交换层析,随后经茚三酮衍生化作用进行,或通过反相HPLC,如Lindroth等(分析化学(1979)51:1167-1174)进行。
以下微生物以纯化培养物形式于2000年7月28日,根据布达佩斯条约,保藏在德意志微生物保藏中心(DSMZ,不伦瑞克,德国):
·大肠杆菌菌株TOP10F/pCR2.1lysR2int,保藏号DSM 13617。
本发明的方法用于发酵生产氨基酸,尤其L-赖氨酸和L-缬氨酸。
本发明借助于以下提供的实施例得以更详述阐述。
从大肠杆菌中分离质粒DNA及所有的限制、Klenow处理和碱性磷酸酶处理方法,均如Sambrook等所述进行(分子克隆实验手册,1989,冷泉港实验室出版社,冷泉港,N.Y.美国)。大肠杆菌的转化方法也见于这本手册。
常用的培养基如LB培养基或TY培养基的组分也得自Sambrook等所著手册。
实施例1制备谷氨酸棒杆菌ATCC 13032的基因组粘粒基因文库
如Tauch等(1995,质粒33:168-179)所述分离谷氨酸棒杆菌ATCC13032的染色体DNA并用限制性内切酶Sau3AI(AmershamPharmacia,Freiburg,德国,产品描述Sau3AI,编码27-0913-02)部分酶切。用虾碱性磷酸酶(Roche Molecular Biochemicals,德国曼海姆,产品描述SAP,编号1758250)将DNA片段去磷酸化。将得自Stratagene公司(La Jolla,USA,产品描述SuperCosl粘粒载体试剂盒,编号251301)的粘粒载体SuperCosl(Wahl等(1987)美国科学院院报84:2160-2164)的DNA,用限制性内切酶XbaI(AmershamPharmacia,Freiburg,德国,产品描述XbaI,编号27-0948-02)酶切并类似地用虾碱性磷酸酶去磷酸化。
粘粒DNA然后用限制性内切酶BamHI(Amersham Pharmacia,Freiburg,德国,产品描述BamHI,编号27-0868-04)酶切。将以此方式处理的粘粒DNA与处理的ATCC13032 DNA片段混合,并用T4DNA连接酶(Amersham Pharmacia,Freiburg,德国,产品描述T4-DNA-连接酶,编号27-0870-04)处理。连接混合物然后用Gigapack II XL包装提取物(Stratagene,La Jolla,USA,产品描述Gigapack II XL包装提取物,编号200217)包装进噬菌体中。
为感染大肠杆菌菌株NM554(Raleigh等,1988,核酸研究16:1563-1575),将细胞置于10mM MgSO4并与噬菌体悬浮液混合。如Sambrook等(1989,分子克隆实验手册,冷泉港)所述进行粘粒文库的感染和滴定,细胞在含100μg/ml氨苄青霉素的LB琼脂(Lennox,1955,病毒学,1:190)上铺板。在37℃保温过夜后,选择重组克隆。
实施例2 lysR2基因的分离和测序
用Qiaprep Spin微量制备试剂盒(产品号27106,Qiagen,Hilden,德国)根据厂商指导分离一个菌落的粘粒DNA,并用限制性内切酶Sau3AI(Amersham Pharmacia,Freiburg,德国,产品描述Sau3AI,编号27-0913-02)部分酶切。用虾碱性磷酸酶(Roche MolecularBiochemicals,德国曼海姆,产品描述SAP,编号1758250)将DNA片段去磷酸化。凝胶电泳分离后,用QiaExII凝胶提取试剂盒(产品号20021,Qiagen,Hilden,德国)分离大小范围为1500-2000bp的粘粒片段。
得自Invitrogen公司(Groningen,荷兰,产品描述Zero背景克隆试剂盒,产品号K2500-01)的测序载体pZero-1的DNA用限制性内切酶BamHI(Amersham Pharmacia,Freiburg,德国,产品描述BamHI,产品号27-0868-04)酶切。如Sambrook等(1989,分子克隆实验手册,冷泉港)所述进行粘粒片段在测序载体pZero-1中的连接,DNA混合物与T4连接酶(Pharmacia Biotech,Freiburg,德国)保温过夜。然后将这一连接混合物电穿孔(Tauch等,1994,FEMS微生物学通信,123:343-7)进大肠杆菌菌株DH5αMCR(Grant,1990,美国科学院院报87:4645-4649)并在含有50μg/ml的zeocin的LB琼脂(Lennox,1955,病毒学,1:190)上铺板。
重组克隆的质粒制备用Biorobot 9600(产品号900200,Qiagen,Hilden,德国)进行。测序用Zimmeermann等(1990,核酸研究18:1067)改良的Sanger等(1977,美国科学院院报74:5463-5467)的双脱氧链终止法进行。使用得自PE应用生物系统公司(产品号403044,Weiterstadt,德国)的“RR罗丹明终止循环测序试剂盒”。在带有购自PE应用生物系统公司(Weiterstadt,德国)的“ABI Prism377”测序仪的“Rotiphoresis NF丙烯酰胺/双丙烯酰胺”凝胶(29:1)(产品号A124.1,Roth,Karlsruhe,德国)中进行凝胶电泳分离和序列分析。
得到的原始序列资料然后用Staden程序包(1986,核酸研究,14:217-231)版本97-0处理。pZero-1衍生物的各个序列组装成连续重叠群。用XNIP程序(Staden,1986,核酸研究,14:217-231)制备计算机辅助编码区分析。同源性分析用“BLAST搜索程序”(Altschul等,1997,核酸研究,25:3389-3402)对“国家生物技术信息中心”(NCBI,Bethesda,MD,USA)的非冗余数据库进行。
获得的核苷酸序列如SEQ ID NO:1所示。对该核苷酸序列的分析显示一933碱基对的开放读框,其被称为lysR2基因。lysR2基因编码310个氨基酸的多肽。
实施例3 用于lysR2基因的整合诱变的整合载体的制备
用Eikmanns等的方法(微生物学140:1817-1828(1994))从菌株ATCC 13032中分离染色体DNA。基于实施例2已知的谷氨酸棒杆菌的lysR2基因的序列,选择如下寡核苷酸进行聚合酶链反应:
lysR2intA:
5′-CCA TCG TCG CAG AAT TCA AC-3′
lysR2intB:
5′-GCT TCT TCG GCT AAT GCA TC-3′。
所述引物由MWG生物技术公司(Ebersberg,德国)合成,根据Innis等的标准PCR方法(PCR方案,方法和应用指南,1990,学术出版社),用来自曼海姆宝灵格公司的Pwo聚合酶进行PCR反应。借助于聚合酶链反应,分离了lysR2基因的一个439bp长的内部片段,示作SEQ ID NO:3。
用来自Invitrogen公司的TOPO TA克隆试剂盒(Carsbad,CA,USA;目录号K4500-01),将扩增的DNA片段连接进载体pCR2.1-TOPO(Mead等,(1991)生物/技术9:657-663)中。
然后将这一连接混合物转化进大肠杆菌菌株TOP10F(Hanahan,DNA克隆实用方法,卷I,IRL出版社,Oxford,华盛顿特区,美国,1985)。通过将转化混合物在补加25mg/l卡那霉素的LB琼脂(Sambrook等,分子克隆实验手册,第2版,冷泉港实验室出版社,冷泉港,纽约,1989)上铺板,选择携带质粒的细胞。用来自Qiagen的QIAprep Spin Miniprep试剂盒从转化子中分离质粒DNA,并用限制酶EcoRI限制消化及琼脂糖凝胶电泳(0.8%)而证实。质粒命名为pCR2.1lysR2int。
实施例4 lysR2基因在赖氨酸生产菌株DSM 5715和缬氨酸生产菌株FERM BP-1763中的整合诱变
根据Tauch等的电穿孔方法(FEMS微生物学通信123:343-347(1994)),将实施例3中的载体pCR2.1lysR2int电穿孔进谷氨酸棒杆菌DSM 5715和乳发酵短杆菌FERM BP-1763中。菌株DSM5715是AEC抗性赖氨酸生产菌(EP-B-435132)。菌株FERM BP-1763是需要异亮氨酸和甲硫氨酸的缬氨酸生产菌(US-A-5188948)。载体pCR2.1lysR2int在DSM 5715或FERM BP-1763中不能独立复制,只有在其整合进DSM5715或FERM BP-1763的染色体中后才能在细胞中保持。通过将电穿孔混合物在补加15mg/l卡那霉素的LB琼脂(Sambrook等,分子克隆实验手册,第2版,冷泉港实验室出版社,冷泉港,纽约,1989)上铺板,选择携带整合进染色体的pCR2.1lysR2int的克隆。
通过用来自宝灵格公司的Dig杂交试剂盒,根据宝灵格曼海姆有限公司的“用于滤膜杂交的DIG系统用户指南”(曼海姆,德国,1993)的方法标记lysR2int片段,以检测整合已经发生。根据Eikmanns等的方法(微生物学140:1817-1828(1994)),从潜在整合子中分离染色体DNA,并分别用限制酶SalI,SacI和HindIII切割。经琼脂糖凝胶电泳分离得到的片段,并用来自宝灵格公司的Dig杂交试剂盒在68℃杂交。实施例3中的质粒pCR2.1lysR2int已插入DSM5715和FERM BP-1763染色体中的染色体lysR2基因内。该菌株命名为DSM5715::pCR2.1lysR2int和FERM BP-1763::pCR2.1lysR2int。
实施例5 L-赖氨酸和L-缬氨酸的生产
实施例4中获得的谷氨酸棒杆菌菌株DSM5715::pCR2.1lysR2int和乳发酵短杆菌FERM BP-1763::pCR2.1lysR2int在适于生产L-赖氨酸和L-缬氨酸的营养培养基中培养,并确定培养物上清中的L-赖氨酸和L-缬氨酸含量。
为此,首先在33℃在具有合适抗生素的琼脂板(具有卡那霉素(25mg/l)的脑心琼脂)上培养菌株24小时。从这些琼脂板培养物开始,接种预培养物(10ml培养基于100ml锥形瓶)。用于预培养的培养基是完全培养基CgIII。
培养基CgIII
NaCl 2.5g/l
Bacto-肽胨 10g/l
Bacto-酵母膏 10g/l
葡萄糖(单独高压灭菌) 2%(w/v)
pH调节为7.4。
向此培养基中加入卡那霉素(25mg/l)。在摇床上于33℃以240rpm振荡培养预培养物24小时。以此预培养物接种主培养物,从而主培养物的起始光密度(OD,660nm)是0.1。培养基MM用作主培养基。
培养基MM:
CSL(玉米浆) 5g/l
MOPS(吗啉代丙磺酸) 20g/l
葡萄糖(单独高压灭菌) 50g/l
盐:
(NH4)2SO4 25g/l
KH2PO4 0.1g/l
MgSO4·7H2O 1.0g/l
CaCl2·2H2O 10mg/l
FeSO4·7H2O 10mg/l
MnSO4·H2O 5.0mg/l
生物素(过滤灭菌) 0.3mg/l
硫胺素·HCl(过滤灭菌)0.2mg/l
CaCO3 25g/l
用氨水将CSL,MOPS和盐溶液调至pH7并高压灭菌。然后加入无菌的底物和维生素溶液,并加入干态高压灭菌的CaCO3。针对培养DSM5715,在培养基中额外加入0.1g/l亮氨酸。针对培养FERMBP-1763,在所述培养基中额外加入0.1g/l异亮氨酸和0.1g/l甲硫氨酸。
以在具有档板的100ml锥形瓶中的10ml体积进行培养,加入卡那霉素(25mg/l)。在33℃和80%大气湿度下进行培养。
72小时后,用Biomek1000(Beckmann仪器有限公司,慕尼黑)确定在660nm测量波长的OD。用Eppendorf-BioTronik公司的氨基酸分析仪(汉堡,德国),经离子交换层析和用茚三酮检测柱后衍生化而确定形成的L-赖氨酸和L-缬氨酸的量。
所得结果示于表1和2。
表1
菌株 | OD(660nm) | 赖氨酸HClg/L |
DSM5715 | 7.5 | 13.01 |
DSM5715::pCR2.1lysR2int | 7.2 | 14.68 |
表2
菌株 | OD(660nm) | 缬氨酸g/L |
FERM BP-1763 | 12.1 | 7.49 |
FERM BP-1763::pCR2.1lysR2int | 13.4 | 10.90 |
附图简述
图1:质粒pCR2.1lysR2int图谱。
图中所采用的缩写和符号有如下含义:
KmR:卡那霉素抗性
EcoRI:限制酶EcoRI的酶切位点
lysR2int:lysR2基因的内部片段
ColE1ori:质粒ColE1的复制源点
序列表
<110>德古萨股份公司
<120>编码lysR2基因的核苷酸序列
<130>000181 BT
<140>
<141>
<160>5
<170>PatentIn Ver.2.1
<210>1
<211>1364
<212>DNA
<213>Corynebacterium glutamicum
<220>
<221>CDS
<222>(232)..(1161)
<223>lysR2基因
<400>1
cctgcgtgca ataaagacca ttgaaagcag caagaccggc ggccagcatc gcaaacacag 60
cgcgcttgta attgcgtgtt cctcgctcga tgccttcgtg gccttcgtgg ccttcgtgtg 120
cctcgacctt gctatctatt gcttggctca tggagttcat catgcgccaa cagcaaatat 180
tagtaaaatg ttagaaatag ctgtttttga ttcactttgt gcatgtaggc t gtg acc 237
Met Thr
1
atg ggc aac gac ggc gga gac ctg cga atc gac gac cta cgc agc ttc 285
Met Gly Asn Asp Gly Gly Asp Leu Arg Ile Asp Asp Leu Arg Ser Phe
5 10 15
att tca gtc gct caa tca ggc cac ctc acc gaa act gcc gaa aga tta 333
Ile Ser Val Ala Gln Ser Gly His Leu Thr Glu Thr Ala Glu Arg Leu
20 25 30
ggc atc ccg cag ccc aca ctt tcc aga cga atc agc cga gtg gaa aaa 381
Gly Ile Pro Gln Pro Thr Leu Ser Arg Arg Ile Ser Arg Val Glu Lys
35 40 45 50
cac gca ggc acc cca ctt ttc gac cgc gcc ggc cgc aaa ctc gtc ctc 429
His Ala Gly Thr Pro Leu Phe Asp Arg Ala Gly Arg Lys Leu Val Leu
55 60 65
aac caa cga ggc cac gcc ttc ctc aac cac gcc agc gcc atc gtc gca 477
Asn Gln Arg Gly His Ala Phe Leu Asn His Ala Ser Ala Ile Val Ala
70 75 80
gaa ttc aac tcc gcc gca act gaa atc aaa cgc ctc atg gac cca gaa 525
Glu Phe Asn Ser Ala Ala Thr Glu Ile Lys Arg Leu Met Asp Pro Glu
85 90 95
aaa ggc aca atc cga ctg gac ttc atg cat tcc ttg ggc act tgg atg 573
Lys Gly Thr Ile Arg Leu Asp Phe Met His Ser Leu Gly Thr Trp Met
100 105 110
gtc ccc gaa ctt atc cga aca ttc cgc gcc gaa cac ccc aac gta gaa 621
Val Pro Glu Leu Ile Arg Thr Phe Arg Ala Glu His Pro Asn Val Glu
115 120 125 130
ttc caa ctc cac caa gcg gca gca atg ctc ctg gta gat cgt gtt ttg 669
Phe Gln Leu His Gln Ala Ala Ala Met Leu Leu Val Asp Arg Val Leu
135 140 145
gct gat gaa act gac ctc gca tta gtt ggc ccc aaa cct gcc gag gtt 717
Ala Asp Glu Thr Asp Leu Ala Leu Val Gly Pro Lys Pro Ala Glu Val
150 155 160
ggt acc tct tta ggg tgg gcg cca ctg ctt cgt caa cga ctt gcc cta 765
Gly Thr Ser Leu Gly Trp Ala Pro Leu Leu Arg Gln Arg Leu Ala Leu
165 170 175
gct gtt ccc gca gat cac cgg ctt gcc tcc ttt tct ggc caa gga gaa 813
Ala Val Pro Ala Asp His Arg Leu Ala Ser Phe Ser Gly Gln Gly Glu
180 185 190
ttg ccg ttg att act gcg gcg gaa gaa cct ttc gtg gcg atg cga gca 861
Leu Pro Leu Ile Thr Ala Ala Glu Glu Pro Phe Val Ala Met Arg Ala
195 200 205 210
ggt ttc ggc acc cga ctc ctc atg gat gca tta gcc gaa gaa gcc ggt 909
Gly Phe Gly Thr Arg Leu Leu Met Asp Ala Leu Ala Glu Glu Ala Gly
215 220 225
ttt gtt ccc aat gtg gtt ttc gaa tcc atg gaa ctc acc acc gtc gca 957
Phe Val Pro Asn Val Val Phe Glu Ser Met Glu Leu Thr Thr Val Ala
230 235 240
ggg ctt gtc agc gca ggt ctc ggc gtt ggt gtg gtt ccg atg gat gat 1005
Gly Leu Val Ser Ala Gly Leu Gly Val Gly Val Val Pro Met Asp Asp
245 250 255
ccg tac ctt ccc aca gtg gga atc gtg caa cgc cca ctt agt cca ccc 1053
Pro Tyr Leu Pro Thr Val Gly Ile Val Gln Arg Pro Leu Ser Pro Pro
260 265 270
gct tat agg gaa cta ggt ttg gtg tgg cga ctc aac gcg ggg ccg gca 1101
Ala Tyr Arg Glu Leu Gly Leu Val Trp Arg Leu Asn Ala Gly Pro Ala
275 280 285 290
cct gcg gtg gat aac ttc cgg aag ttc gtg gcg gga tcg agg tat gca 1149
Pro Ala Val Asp Asn Phe Arg Lys Phe Val Ala Gly Ser Arg Tyr Ala
295 300 305
tta gaa gag ggc tgagctgtaa gtgtcgtggg tgccgtttta aggggttgag 1201
Leu Glu Glu Gly
310
ttttcccgat gactaggagt tggtccagat tgtgcgttag gggcccctag gggcgattct 1261
ggggctggtg tttttgtggc catgggggtt ggtgttaatc ctggaggctt gctgcaagat 1321
tgctgttaaa cttctcgtca cggatcgctt gggaagcctg gaa 1364
<210>2
<211>310
<212>PRT
<213>Corynebacterium glutamicum
<400>2
Met Thr Met Gly Asn Asp Gly Gly Asp Leu Arg Ile Asp Asp Leu Arg
1 5 10 15
Ser Phe Ile Ser Val Ala Gln Ser Gly His Leu Thr Glu Thr Ala Glu
20 25 30
Arg Leu Gly Ile Pro Gln Pro Thr Leu Ser Arg Arg Ile Ser Arg Val
35 40 45
Glu Lys His Ala Gly Thr Pro Leu Phe Asp Arg Ala Gly Arg Lys Leu
50 55 60
Val Leu Asn Gln Arg Gly His Ala Phe Leu Asn His Ala Ser Ala Ile
65 70 75 80
Val Ala Glu Phe Asn Ser Ala Ala Thr Glu Ile Lys Arg Leu Met Asp
85 90 95
Pro Glu Lys Gly Thr Ile Arg Leu Asp Phe Met His Ser Leu Gly Thr
100 105 110
Trp Met Val Pro Glu Leu Ile Arg Thr Phe Arg Ala Glu His Pro Asn
115 120 125
Val Glu Phe Gln Leu His Gln Ala Ala Ala Met Leu Leu Val Asp Arg
130 135 140
Val Leu Ala Asp Glu Thr Asp Leu Ala Leu Val Gly Pro Lys Pro Ala
145 150 155 160
Glu Val Gly Thr Ser Leu Gly Trp Ala Pro Leu Leu Arg Gln Arg Leu
165 170 175
Ala Leu Ala Val Pro Ala Asp His Arg Leu Ala Ser Phe Ser Gly Gln
180 185 190
Gly Glu Leu Pro Leu Ile Thr Ala Ala Glu Glu Pro Phe Val Ala Met
195 200 205
Arg Ala Gly Phe Gly Thr Arg Leu Leu Met Asp Ala Leu Ala Glu Glu
210 215 220
Ala Gly Phe Val Pro Asn Val Val Phe Glu Ser Met Glu Leu Thr Thr
225 230 235 240
Val Ala Gly Leu Val Ser Ala Gly Leu Gly Val Gly Val Val Pro Met
245 250 255
Asp Asp Pro Tyr Leu Pro Thr Val Gly Ile Val Gln Arg Pro Leu Ser
260 265 270
Pro Pro Ala Tyr Arg Glu Leu Gly Leu Val Trp Arg Leu Asn Ala Gly
275 280 285
Pro Ala Pro Ala Val Asp Asn Phe Arg Lys Phe Val Ala Gly Ser Arg
290 295 300
Tyr Ala Leu Glu Glu Gly
305 310
<210>3
<211>439
<212>DNA
<213>Corynebacterium glutamicum
<220>
<223>lysR2int
<400>3
ccatcgtcgc agaattcaac tccgccgcaa ctgaaatcaa acgcctcatg gacccagaaa 60
aaggcacaat ccgactggac ttcatgcatt ccttgggcac ttggatggtc cccgaactta 120
tccgaacatt ccgcgccgaa caccccaacg tagaattcca actccaccaa gcggcagcaa 180
tgctcctggt agatcgtgtt ttggctgatg aaactgacct cgcattagtt ggccccaaac 240
ctgccgaggt tggtacctct ttagggtggg cgccactgct tcgtcaacga cttgccctag 300
ctgttcccgc agatcaccgg cttgcctcct tttctggcca aggagaattg ccgttgatta 360
ctgcggcgga agaacctttc gtggcgatgc gagcaggttt cggcacccga ctcctcatgg 420
atgcattagc cgaagaagc 439
<210>4
<211>20
<212>DNA
<213>Corynebacterium glutamicum
<220>
<223>引物lysR2intA
<400>4
ccatcgtcgc agaattcaac 20
<210>5
<211>20
<212>DNA
<213>Corynebacterium glutamicum
<220>
<223>引物lysR2intB
<400>5
gcttcttcgg ctaatgcatc 20
Claims (14)
1、一种来自棒状细菌的分离的多核苷酸,其由编码lysR2基因的多核苷酸序列组成,所述多核苷酸选自:
a)编码由SEQ ID NO:2的氨基酸序列组成的多肽的多核苷酸,
b)与a)的多核苷酸互补的多核苷酸,
所述多肽具有转录调节物LysR2的活性。
2、权利要求1的多核苷酸,其中多核苷酸是在棒状细菌中能复制的重组的DNA。
3、权利要求1的多核苷酸,其中多核苷酸是RNA。
4、权利要求2的多核苷酸,由SEQ ID NO:1所示核酸序列组成。
5、载体pCR2.1lysR2int,其
5.1携带SEQ ID NO:3所示的439bp的lysR2基因的内部片段,
5.2其以大肠杆菌菌株TOP10F/pCR2.1lysR2int的形式保藏在德意志微生物保藏中心,保藏号DSM13617。
6、一种棒状细菌,其中lysR2基因是通过缺失而被弱化或被消除,其中lysR2基因编码SEQ ID NO:2所示的多肽。
7、一种生产L-赖氨酸或L-缬氨酸的方法,其包括以下步骤:
(a)发酵生产L-赖氨酸或L-缬氨酸的细菌,该细菌中至少lysR2基因被弱化,其中lysR2基因编码SEQ ID NO:2所示的多肽,
(b)浓缩培养基或细菌细胞中的所需产物,及
(c)分离L-赖氨酸或L-缬氨酸。
8、权利要求7的方法,其中编码lysR2基因的一或多种多核苷酸的表达被降低或被消除。
9、权利要求7的方法,其中为生产L-赖氨酸,发酵的细菌中选自以下的一或多个基因被同时增强或过表达:
9.1编码二氢-2,6-吡啶二羧酸合酶的dapA基因,
9.2编码烯醇化酶的eno基因,
9.3编码zwf基因产物的zwf基因,
9.4编码丙酮酸羧化酶的pyc基因,
9.5编码赖氨酸输出的lysE基因,
9.6编码反馈抗性天冬氨酸激酶的lysC基因,
9.7编码Zwa1蛋白的zwa1基因。
10、权利要求7的方法,其中选自以下的一或多个基因被同时弱化或被消除:
10.1编码磷酸烯醇丙酮酸羧激酶的pck基因,
10.2编码葡糖-6-磷酸异构酶的pgi基因,
10.3编码丙酮酸氧化酶的poxB基因,
10.4编码Zwa2蛋白的zwa2基因,
10.5编码高丝氨酸脱氢酶的hom基因,
10.6编码高丝氨酸激酶的thrB基因,
10.7编码天冬氨酸脱羧酶的panD基因。
11、权利要求7的方法,其中为生产L-缬氨酸,发酵的细菌中选自以下的一或多个基因被同时增强或过表达:
11.1编码乙酰羟酸合酶的ilvBN基因,
11.2编码二羟酸脱水酶的ilvD基因,
11.3编码苹果酸:醌氧化还原酶的mqo基因。
12、权利要求7-11任一项的方法,其中使用的是谷氨酸棒杆菌或乳发酵短杆菌的微生物。
13、权利要求1-4任一项的多核苷酸序列作为杂交探针用于分离编码转录调节物lysR2的核酸、多核苷酸或基因,或与lysR2基因的序列具有高度相似性的核酸、多核苷酸或基因的应用。
14、权利要求13的应用,其中采用阵列、微阵列或DNA芯片。
Applications Claiming Priority (4)
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DE10039047 | 2000-08-10 | ||
DE10039047.1 | 2000-08-10 | ||
DE10110346.8 | 2001-03-03 | ||
DE10110346A DE10110346A1 (de) | 2000-08-10 | 2001-03-03 | Neue für das IysR2-Gen kodierende Nukleotidsequenzen |
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CN1446259A CN1446259A (zh) | 2003-10-01 |
CN100529081C true CN100529081C (zh) | 2009-08-19 |
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US (2) | US7078502B2 (zh) |
EP (1) | EP1307563B1 (zh) |
CN (1) | CN100529081C (zh) |
AT (1) | ATE274061T1 (zh) |
AU (1) | AU2001279663A1 (zh) |
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WO2002012504A1 (en) * | 2000-08-10 | 2002-02-14 | Degussa Ag | Nucleotide sequences which code for the lysr2 gene |
US6546074B1 (en) * | 2001-03-27 | 2003-04-08 | Astex Technology Limited | Protein crystal structure and method for identifying protein modulators |
DE102004013503A1 (de) * | 2004-03-18 | 2005-10-06 | Degussa Ag | Verfahren zur Herstellung von L-Aminosäuren unter Verwendung coryneformer Bakterien |
HUE028873T2 (en) | 2006-10-24 | 2017-01-30 | Basf Se | A method for increasing gene expression using modified codon usage |
EP2082045B1 (en) * | 2006-10-24 | 2015-03-18 | Basf Se | Method of reducing gene expression using modified codon usage |
US8647642B2 (en) | 2008-09-18 | 2014-02-11 | Aviex Technologies, Llc | Live bacterial vaccines resistant to carbon dioxide (CO2), acidic PH and/or osmolarity for viral infection prophylaxis or treatment |
US11180535B1 (en) | 2016-12-07 | 2021-11-23 | David Gordon Bermudes | Saccharide binding, tumor penetration, and cytotoxic antitumor chimeric peptides from therapeutic bacteria |
US11129906B1 (en) | 2016-12-07 | 2021-09-28 | David Gordon Bermudes | Chimeric protein toxins for expression by therapeutic bacteria |
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SK18882001A3 (sk) * | 1999-06-25 | 2002-09-10 | Basf Aktiengesellschaft | Gény Corynebacterium glutamicum kódujúce stresové, rezistenčné a tolerančné proteíny |
JP4623825B2 (ja) * | 1999-12-16 | 2011-02-02 | 協和発酵バイオ株式会社 | 新規ポリヌクレオチド |
WO2002012504A1 (en) * | 2000-08-10 | 2002-02-14 | Degussa Ag | Nucleotide sequences which code for the lysr2 gene |
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US20020081674A1 (en) | 2002-06-27 |
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ATE274061T1 (de) | 2004-09-15 |
EP1307563B1 (en) | 2004-08-18 |
EP1307563A1 (en) | 2003-05-07 |
US7078502B2 (en) | 2006-07-18 |
US20050282259A1 (en) | 2005-12-22 |
AU2001279663A1 (en) | 2002-02-18 |
ES2223900T3 (es) | 2005-03-01 |
US7416863B2 (en) | 2008-08-26 |
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