CN1807605A - 小鼠白血病病毒逆转录酶突变体及其表达方法与应用 - Google Patents
小鼠白血病病毒逆转录酶突变体及其表达方法与应用 Download PDFInfo
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- CN1807605A CN1807605A CN 200610001356 CN200610001356A CN1807605A CN 1807605 A CN1807605 A CN 1807605A CN 200610001356 CN200610001356 CN 200610001356 CN 200610001356 A CN200610001356 A CN 200610001356A CN 1807605 A CN1807605 A CN 1807605A
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Abstract
本发明公开了小鼠白血病病毒逆转录酶突变体及其表达方法与应用。该小鼠白血病病毒逆转录酶突变体,是将小鼠白血病病毒逆转录酶的自N端第84位谷氨酰胺残基取代为氨基酸残基X的蛋白质,其中X为侧链短于谷氨酰胺侧链的氨基酸。本发明的小鼠白血病病毒逆转录酶突变体具有比RT-F155V-H更高的RNA聚合酶比活性和RNA合成能力。
Description
技术领域
本发明涉及一种逆转录酶突变体及其表达方法与应用,特别涉及小鼠白血病病毒逆转录酶突变体及其表达方法,与该小鼠白血病病毒逆转录酶突变体在合成RNA中的应用。
背景技术
根据对底物的选择特异性,传统上把核酸聚合酶分为DNA聚合酶和RNA聚合酶两大类。聚合酶对底物的选择通常是非常严格的,因为它们分别承担着遗传物质的复制和转录两个生物学最基本的功能。
然而对聚合酶的分类可能并非象想像的那么简单。DNA聚合酶和RNA聚合酶尽管在一级结构上没有同源性,但是它们的聚合酶结构域的高级结构却非常类似,呈一个半张开的右手状,包含有手掌,手指以及拇指亚结构域。另外,它们的催化机制也非常的类似。而对作为底物的脱氧核糖核苷酸(dNTPs)和核糖核苷酸(rNTPs)而言,它们的唯一区别就是rNTPs的2’-OH基团。这说明DNA聚合酶和RNA聚合酶之间可能存在着某种关联,或者说它们在进化上存在着某种相关性,有可能通过它们结构上的一个小的改变,来实现DNA聚合酶和RNA聚合酶的角色转换。
小鼠白血病病毒(Murine Leukemia Virus,简称MLV)逆转录酶(ReverseTranscriptase,简称RT,是由逆转录病毒编码的DNA聚合酶,能以RNA或DNA作为模板合成DNA。Guangxia Gao等于1997年发表在Proceedings of the NationalAcademy of sciences of the Unite States of America第407-411页的文章(专利号:US6136582)表明,当将MLV-RT的自N-端155位的苯丙氨酸(F155)突变成缬氨酸(V)时,RT-F155V能够利用RNA或者DNA作为模板将rNTPs参入到产物,也就是说RT具有了RNA聚合酶的活性。RT-F155V-H带有F155V和D524N双突变的MMLV RT,F155V突变使RT具有了参入rNTPs的能力,D524N突变将消除MMLV RT的RNase H活性,这样可以避免RT的RNase H活性对RNA产物的降解。
但是RT-F155V-H催化RNA合成的效率仍然很低,而且合成的RNA片段也很短。
发明内容
本发明的一个目的是提供小鼠白血病病毒逆转录酶突变体。
本发明所提供的小鼠白血病病毒逆转录酶突变体,是将小鼠白血病病毒逆转录酶的自N端第155位苯丙氨酸残基取代为缬氨酸、自N端第524位天门冬氨酸残基取代为天门冬酰胺残基和自N端第84位谷氨酰胺残基取代为氨基酸残基X的蛋白质,其中X为侧链短于谷氨酰胺侧链的氨基酸。该小鼠白血病病毒逆转录酶突变体的名称为RT-Q84X-F155V-H。
所述小鼠白血病病毒逆转录酶(MLV-RT)的氨基酸序列如序列3所示。
所述X可为丙氨酸、天门冬酰胺、天门冬氨酸或丝氨酸。
所述X为丙氨酸;所述小鼠白血病病毒逆转录酶突变体具有序列表中序列2的氨基酸残基序列,该小鼠白血病病毒逆转录酶突变体的名称为RT-Q84A-F155V-H。
上述小鼠白血病病毒逆转录酶突变体的编码基因也属于本发明的保护范围。
所述小鼠白血病病毒逆转录酶突变体具有序列表中序列2的氨基酸残基序列;所述小鼠白血病病毒逆转录酶突变体编码基因(RT-Q84A-F155V-H)具有序列表中序列1的自5′端第1515位至第3527位脱氧核苷酸的核苷酸序列。
本发明的另一个目的是提供一种表达RT-Q84A-F155V-H的方法。
该表达RT-Q84X-F155V-H的方法,是将含有RT-Q84X-F155V-H编码基因的表达载体转化到大肠杆菌中,培养阳性克隆,表达得到小鼠白血病病毒逆转录酶突变体。
所述含有RT-Q84X-F155V-H编码基因的表达载体是具有序列表中序列1的核苷酸序列的质粒pTacRT-Q84A-F155V-D524N。
所述大肠杆菌优选为Escherichia coli BL21。
本发明利用蛋白质工程方法,将一种DNA聚合酶小鼠白血病病毒逆转录酶(MLV-RT)改造成具有较高酶活性和RNA合成能力的RNA聚合酶。实验证明RT-Q84X-F155V-H具有比RT-F155V-H更高的RNA聚合酶比活性和RNA合成能力。
附图说明
图1是RT-Q84A-F155V-H纯化后的SDS-PAGE电泳检测图。
图2是RT-Q84A-F155V-H和RT-F155V-H的RNA聚合酶活性的比较图。
图3是RT-Q84A-F155V-H和RT-F155V-H合成RNA片段能力的比较图。
具体实施方式
本发明通过分析MLV-RT的晶体结构模型,发现该酶第84位的谷氨酰胺(Q84)位于酶的活性中心附近,参与调控酶的催化能力,其较长的侧链妨碍合成产物的延伸,影响RNA聚合酶的活性和合成RNA的能力。本发明将这个位于酶的活性中心的大的氨基酸残基替换成小的氨基酸残基,协助这些DNA聚合酶更好的容纳RNA产物。本发明将RT-F155V-H基因进行突变,使Q84残基突变成侧链较短的残基,产生了新的突变酶RT-F155V-Q84X,其中X为侧链短于谷氨酰胺侧链的氨基酸,如天冬酰胺(Asn)、丝氨酸(Ser)、丙氨酸(Ala)等。同时,本发明将Q84X突变引入RT-F155V-H中,使之成为RT-Q84X-F155V-H。本发明比较了将MLV-RT中第84位的谷氨酰胺突变为丙氨酸后产生的RT-Q84A-F155V-H和RT-F155V-H的RNA聚合酶活性及RNA合成能力,实验证明RT-Q84A-F155V-H具有比RT-F155V-H更高的RNA聚合酶比活性和RNA合成能力。
本发明还提供了一种在大肠杆菌E.coli中表达重组RT-Q84X-F155V-H逆转录酶的方法。
下面通过优选实例对本发明做更详细的描述。下述实施例中的实验方法,如无特别说明,均为常规方法。下述实施例中的百分含量,如无特别说明,均为质量百分含量。
实施例1、RT-Q84A-F155V-H的合成及其功能
本实施例中将RT-F155V-H(Guangxia Gao等于1997年发表在Proceedings ofthe National Academy of sciences of the Unite States of America第407-411页的文章,专利号:US6136582)中的第84位的谷氨酰胺突变为丙氨酸,使之成为RT-Q84A-F155V-H。
1、质粒pTacRT-Q84A-F155V-D524N的构建
RT-Q84A-F155V-H的定点突变采用将两段PCR产物AflII-EcoRI和EcoRI-MfeI替换掉pTacRT-F155V-D524N的AflII-MfeI片段(nt1467-2280)。引物Q84A-SP(5’CG
GAATTCTGGTACCCTGCCAGTC)包含有一个由于同义突变产生的EcoRI酶切位点(用下划线表示),它和下游引物PCR扩增得到一个300bp的EcoRI-MfeI片段。引物Q84A-AP(5’CG
GAATTCCCGCGTCCAACAGTCTCTGTA)同样包含有一个由于同义突变产生的EcoRI酶切位点以及突变的丙氨酸密码子(黑体表示),它和上游引物经PCR扩增得到一个500bp的AflII-EcoRI片段。所得重组质粒通过酶切鉴定为阳性克隆。具体方法如下:
(1)EcoRI-MfeI片段的合成
以pTacRT-F155V-D524N(Guangxia Gao等于1997年发表在Proceedings of theNational Academy of sciences of the Unite States of America第407-41l页的文章,专利号:US6136582)为模板,利用上游引物Q84A-SP和下游引物:MfeI-AP(5’-TGGGAGTCTGGTCCAGG-3’PCR扩增得到300bp的EcoRI-MfeI片段。其中,PCR的温度条件为:先95℃预变性2min;然后95℃30s,55℃1min,72℃1min,20个循环;最后72℃,10min补平末端。
(2)AflII-EcoRI片段的合成
以pTacRT-F155V-D524N(Guangxia Gao等于1997年发表在Proceedings of theNational Academy of sciences of the Unite States of America第407-411页的文章,专利号:US6136582)为模板,利用上游引物:AflII-SP(5’-GTGGAATTGTGAGCGGA-3’)和下游引物Q84A-AP PCR扩增得到一个500bp的AflII-EcoRI片段。其中,PCR的温度条件为:先95℃预变性2min;然后95℃ 30s,55℃ 1min,72℃ 1min,20个循环;最后72℃,10min补平末端。
(3)质粒pTacRT-Q84A-F155V-D524N的构建
将经AflII和EcoRI酶切后的AflII-EcoRI片段,EcoRI和MfeI酶切后的EcoRI-MfeI片段和经AflII和MfeI酶切pTacRT-F155V-D524N(Guangxia Gao等于1997年发表在Proceedings of the National Academy of sciences of the UniteStates of America第407-411页的文章,专利号:US6136582)后得到的6.7kb片段连接,得到AflII-EcoRI和EcoRI-MfeI替换掉pTacRT-F155V-D524N的AflII-MfeI片段(nt1467-2280)的质粒pTacRT-Q84A-F155V-D524N,测序表明pTacRT-Q84A-F155V-D524N(序列1)含有具有序列表中序列1的自5′端第1515位至第3527位脱氧核苷酸的小鼠白血病病毒逆转录酶突变体编码基因RT-Q84A-F155V-H,编码具有序列表中序列2的氨基酸序列的小鼠白血病病毒逆转录酶突变体RT-Q84A-F155V-H。
2、RT-Q84A-F155V-H在大肠杆菌中的诱导和表达
将pTacRT-Q84A-F155V-D524N转化Escherichia coli BL21,挑取单菌落接种于含100μg/ml氨苄青霉素的LB液体培养基中,37℃培养至0D600≈0.5时,加入IPTG至终浓度0.5mM,37℃继续培养2-3小时,收集菌体,将菌体用预冷的50mMTris-HCl(pH 7.5)洗涤一次后备用。
3、RT-Q84A-F155V-H的纯化
将收集的菌体悬浮于缓冲液A(20mM PBS,pH 7.4,0.5M NaCl),冻融后,加入溶菌酶至终浓度0.5mg/ml,4℃消化30min,超声波破碎3次,每次20秒,离心,收集上清。经过金属螯合层析柱HiTrap chelating HP column(购自Pharmacia)分离纯化后,纯度即达80%以上,收集活性蛋白峰,经过离子交换层析柱MonoS(购自Pharmacia)进一步分离纯化后,电泳检测考马斯亮蓝染色,结果显示该蛋白为一分子量约为76KD的均一条带,未见杂质(图1),达到对RT进行酶学研究分析的要求。图1中各泳道分别为:M:分子量标准;1:RT-Q84A-F155V-H;2、RT-F155V-H(Guangxia Gao等于1997年发表在Proceedings of the National Academy ofsciences of the Unite States of America第407-411页的文章;US6136582)。
4、RT-Q84A-F155V-H的RNA聚合酶活性测定及动力学分析
50μl反应体系中包括40ng RT纯酶样品,60mM Tris.HCl(pH 8.0),75mM NaCl,0.7mM MnCl2,5mM DTT,12μg/ml Poly(rA)模板,6μg/ml oligo(dT)18引物,10μCi/ml(1Ci=37GBq)32P标记的UTP以及12μM未标记的UTP,反应于37℃进行。分别于反应开始后不同时间点取样4μl点于DE81滤纸,终止反应。然后将DE81滤纸用2×SSC洗涤三次,95%乙醇漂洗两次,将滤纸晾干后,放射自显影。定量分析采用液闪计数仪测定。
动力学分析采用公知的双倒数作图法进行。用每个样品中“保留在DE81滤纸的放射强度/同一样品总的放射强度”来表示参入到产物中的UTP的量。
选用poly(rA)-oligo(dT)18作为模板-引物,rUTP为底物对这三个变体酶进行RNA聚合酶酶活分析,结果显示,当将Q84替换成A后,能提高RT-F155V-H的RNA聚合酶的活性(图2,比较RT-Q84A-F155V-H和RT-F155V-H)。将Q84突变成天冬酰氨(N)(比Q少一个甲基基团)得到的RT-Q84N-F155V-H(RT-Q84N-F155V-H也由671个氨基酸残基组成,除自氨基端第84位氨基酸残基为Asn外,其它氨基酸残基与序列2相同,可参照RT-Q84A-F155V-H的表达方法进行制备),同样能提高RT-F155V-H的RNA聚合酶活性(图2,RT-Q84N-F155V-H))。作为对照,将Q84替换成大的氨基酸残基如RT-Q84R-F155V-H(RT-Q84R-F155V-H也由671个氨基酸残基组成,除自氨基端第84位氨基酸残基为Arg外,其它氨基酸残基与序列2相同,可参照RT-Q84A-F155V-H的表达方法进行制备)时,则不能提高RT-F155V-H的RNA聚合酶活性(图2,RT-Q84R-F155V-H)。需要指出的是,是F155V突变使得MMLV RT具有了RNA聚合酶活性,只带有Q84A和D524N双突变的RT-Q84A-H(RT-Q84A-H也由671个氨基酸残基组成,除自氨基端第84位氨基酸残基为Ala、第155位氨基酸残基为Phe、第524位氨基酸残基为Asn外,其它氨基酸残基与序列2相同,可按常规方法制备)与RT-WT-H(RT-WT-H也是由671个氨基酸残基组成,除自氨基端第84位氨基酸残基为Gln、第155位氨基酸残基为Phe、第524位氨基酸残基为Asn外,其它氨基酸残基与序列2相同,可按常规方法制备)一样,不具有RNA聚合酶活性。
动力学分析显示,在以UTP为底物时,RT-Q84A-F155V-H和RT-F155V-H具有相似的Km(分别为2.98μM和2.88μM),而RT-Q84A-F155V-H的最大反应速率Vmax值则是RT-F155V-H的4.3倍(分别为9.94nmol.min-1.ng-1和2.31nmol.min-1.ng-1)(见表1)。
表1.RT-Q84A-F155V-H与RT-F155V-H RNA聚合酶动力学参数比较。
酶 | rUTP | |
Vmax(nmol.min-1.ng-1) | Km(μM) | |
RT-F155V-H | 2.31±0.30 | 2.88±0.67 |
RT-Q84A-F155V-H | 9.94±0.90 | 2.98±0.72 |
5、RT合成RNA实验
将寡核苷酸P21(5’-AAGCCCCACATACAGAGACTG-3’)用[γ-32P]ATP进行末端标记。此标记产物*P21先过G25柱纯化,然后与作为模板的一段寡核苷酸T36(3’-TTCGGGGTGTATGTCTCTGACAACCTGGTCGTCCCT-5’)退火。退火反应先在65℃保温10min,然后缓慢降温至室温。RNA合成反应60μl反应体系中包括3μg RT纯酶样品,60mM Tris.HCl(pH 8.0),75mM NaCl,0.7mM MnCl2,5mM DTT,0.1μM*P21/T36以及500μM未标记的超纯的rNTP(Amersham)。反应于37℃进行,反应开始后于不同时间点取样中止反应。然后通过23%尿素PAGE分离产物,放射自显影检测,采用PhosphorImager定量。
和Gguangxia Gao等1997年发表的结果一致,RT-F155V-H在反应120min后仍然只能合成7个核苷酸的一段RNA(图3,泳道6箭头示)。与之相比较,经过30min反应RT-Q84A-F155V-H就能合成出更长的RNA产物。并且RT-Q84A-F155V-H合成RNA的速率要比RT-F155V-H快得多(图3,比较第2和7,3和8,4和9,5和10,6和11泳道)。同样的反应条件下,以dNTPs作为底物充分延伸得到的全长DNA(36nt)的迁移速率明显比RT-Q84A-F155V-H合成的最长的RNA快,表明RT-Q84A-F155V-H的合成产物不是由于dNTPs的污染造成的。RT-Q84A-F155V-H合成的最长RNA产物是一段全长的15-nt RNA(图3,第11泳道)。图3中,泳道1为*P21的电泳结果,泳道2、3、4、5、6分别为RT-F155V-H反应5、10、30、60和120分钟的产物电泳结果,泳道7、8、9、10、11分别为RT-Q84A-F155V-H反应5、10、30、60和120分钟的产物电泳结果,泳道12为同样的反应条件下,以dNTPs作为底物RT-Q84A-F155V-H合成的DNA电泳结果。
序列表
<160>3
<210>1
<211>7488
<212>DNA
<213>人工序列
<220>
<223>
<400>1
ccgacaccat cgaatggtgc aaaacctttc gcggtatggc atgatagcgc ccggaagaga 60
gtcaattcag ggtggtgaat gtgaaaccag taacgttata cgatgtcgca gagtatgccg 120
gtgtctctta tcagaccgtt tcccgcgtgg tgaaccaggc cagccacgtt tctgcgaaaa 180
cgcgggaaaa agtggaagcg gcgatggcgg agctgaatta cattcccaac cgcgtggcac 240
aacaactggc gggcaaacag tcgttgctga ttggcgttgc cacctccagt ctggccctgc 300
acgcgccgtc gcaaattgtc gcggcgatta aatctcgcgc cgatcaactg ggtgccagcg 360
tggtggtgtc gatggtagaa cgaagcggcg tcgaagcctg taaagcggcg gtgcacaatc 420
ttctcgcgca acgcgtcagt gggctgatca ttaactatcc gctggatgac caggatgcca 480
ttgctgtgga agctgcctgc actaatgttc cggcgttatt tcttgatgtc tctgaccaga 540
cacccatcaa cagtattatt ttctcccatg aagacggtac gcgactgggc gtggagcatc 600
tggtcgcatt gggtcaccag caaatcgcgc tgttagcggg cccattaagt tctgtctcgg 660
cgcgtctgcg tctggctggc tggcataaat atctcactcg caatcaaatt cagccgatag 720
cggaacggga aggcgactgg agtgccatgt ccggttttca acaaaccatg caaatgctga 780
atgagggcat cgttcccact gcgatgctgg ttgccaacga tcagatggcg ctgggcgcaa 840
tgcgcgccat taccgagtcc gggctgcgcg ttggtgcgga tatctcggta gtgggatacg 900
acgataccga agacagctca tgttatatcc cgccgttaac caccatcaaa caggattttc 960
gcctgctggg gcaaaccagc gtggaccgct tgctgcaact ctctcagggc caggcggtga 1020
agggcaatca gctgttgccc gtctcactgg tgaaaagaaa aaccaccctg gcgcccaata 1080
cgcaaaccgc ctctccccgc gcgttggccg attcattaat gcagctggca cgacaggttt 1140
cccgactgga aagcgggcag tgagcgcaac gcaattaatg tgagttagct cactcattag 1200
gcacaattct catgtttgac agcttatcat cgactgcacg gtgcaccaat gcttctggcg 1260
tcaggcagcc atcggaagct gtggtatggc tgtgcaggtc gtaaatcact gcataattcg 1320
tgtcgctcaa ggcgcactcc cgttctggat aatgtttttt gcgccgacat cataacggtt 1380
ctggcaaata ttctgaaatg agctgttgac aattaatcat cggctcgtat aatgtgtgga 1440
attgtgagcg gataacaatt tgaattctta agatttgtga ggggataaca atttcacaca 1500
ggaaacagaa tatgacccta aatatagaag atgagcatcg gctacatgag acctcaaaag 1560
agccagatgt ttctctaggg tccacatggc tgtctgattt tcctcaggcc tgggcggaaa 1620
ccgggggcat gggactggca gttcgccaag ctcctctgat catacctctg aaagcaacct 1680
ctacccccgt gtccataaaa caatacccca tgtcacaaga agccagactg gggatcaagc 1740
cccacataca gagactgttg gacgcgggaa tcctggtacc ctgccagtcc ccctggaaca 1800
cgcccctgct acccgttaag aaaccaggga ctaatgatta taggcctgtc caggatctga 1860
gagaagtcaa caagcgggtg gaagacatcc accccaccgt gcccaaccct tacaacctct 1920
tgagcgggct cccaccgtcc caccagtggt acactgtgct tgatcttaag gatgccgttt 1980
tctgcctgag actccacccc accagtcagc ctctcttcgc ctttgagtgg agagatccag 2040
agatgggaat ctcaggacaa ttgacctgga ccagactccc acagggtttc aaaaacagtc 2100
ccaccctgtt tgatgaggca ctgcacagag acctagcaga cttccggatc cagcacccag 2160
acttgatcct gctacagtac gtggatgact tactgctggc cgccacttct gagctagact 2220
gccaacaagg tactcgggcc ctgttacaaa ccctagggaa cctcgggtat cgggcctcgg 2280
ccaagaaagc ccaaatttgc cagaaacagg tcaagtatct ggggtatctt ctaaaagagg 2340
gtcagagatg gctgactgag gccagaaaag agactgtgat ggggcagcct actccgaaga 2400
cccctcgaca actaagggag ttcctaggga cggcaggctt ctgtcgcctc tggatccctg 2460
ggtttgcaga aatggcagcc cccttgtacc ctctcaccaa aacggggact ctgtttaatt 2520
ggggcccaga ccaacaaaag gcctatcaag aaatcaagca agctcttcta actgccccag 2580
ccctggggtt gccagatttg actaagccct ttgaactctt tgtcgacgag aagcagggct 2640
acgccaaagg tgtcctaacg caaaaactgg gaccttggcg tcggccggtg gcctacctgt 2700
ccaaaaagct agacccagta gcagctgggt ggcccccttg cctacggatg gtagcagcca 2760
ttgccgtact gacaaaggat gcaggcaagc taaccatggg acagccacta gtcattctgg 2820
ccccccatgc agtagaggca ctagtcaaac aaccccccga ccgctggctt tccaacgccc 2880
ggatgactca ctatcaggcc ttgcttttgg acacggaccg ggtccagttc ggaccggtgg 2940
tagccctgaa cccggctacg ctgctcccac tgcctgagga agggctgcaa cacaactgcc 3000
ttgatatcct ggccgaagcc cacggaaccc gacccgacct aacggaccag ccgctcccag 3060
acgccgacca cacctggtat acgaatggaa gcagtctctt acaagaggga cagcgtaagg 3120
cgggagctgc ggtgaccacc gagaccgagg taatctgggc taaagccctg ccagccggga 3180
catccgctca gcgggctgaa ctgatagcac tcacccaggc cctaaagatg gcagaaggta 3240
agaagctaaa tgtttatact gatagccgtt atgcttttgc tactgcccat atccatggag 3300
aaatatacag aaggcgtggg ttgctcacat cagaaggcaa agagatcaaa aataaagacg 3360
agatcttggc cctactaaaa gccctctttc tgcccaaaag acttagcata atccattgtc 3420
caggacatca aaagggacac agcgccgagg ctagaggcaa ccggatggct gaccaagcgg 3480
cccgaaaggc agccatcaca gagactccag acacctctac cctcctccat caccatcacc 3540
atcactagtc tagagtcgac ctgcaggcaa gcttggcact ggccgtcgtt ttacaacgtc 3600
gtgactggga aaaccctggc gttacccaac ttaatcgcct tgcagcacat ccccctttcg 3660
ccagctggcg taatagcgaa gaggcccgca ccgatcgccc ttcccaacag ttgcgcagcc 3720
tgaatggcga atggcagctt ggctgttttg gcggatgaga taagattttc agcctgatac 3780
agattaaatc agaacgcaga agcggtctga taaaacagaa tttgcctggc ggcagtagcg 3840
cggtggtccc acctgacccc atgccgaact cagaagtgaa acgccgtagc gccgatggta 3900
gtgtggggtc tccccatgcg agagtaggga actgccaggc atcaaataaa acgaaaggct 3960
cagtcgaaag actgggcctt tcgttttatc tgttgtttgt cggtgaacgc tctcctgagt 4020
aggacaaatc cgccgggagc ggatttgaac gttgcgaagc aacggcccgg agggtggcgg 4080
gcaggacgcc cgccataaac tgccaggcat caaattaagc agaaggccat cctgacggat 4140
ggcctttttg cgtttctaca aactcttttt gtttattttt ctaaatacat tcaaatatgt 4200
atccgctcat gagacaataa ccctgataaa tgcttcaata atattgaaaa aggaagagta 4260
tgagtattca acatttccgt gtcgccctta ttcccttttt tgcggcattt tgccttcctg 4320
tttttgctca cccagaaacg ctggtgaaag taaaagatgc tgaagatcag ttgggtgcac 4380
gagtgggtta catcgaactg gatctcaaca gcggtaagat ccttgagagt tttcgccccg 4440
aagaacgttc tccaatgatg agcactttta aagttctgct atgtggcgcg gtattatccc 4500
gtgttgacgc cgggcaagag caactcggtc gccgcataca ctattctcag aatgacttgg 4560
ttgagtactc accagtcaca gaaaagcatc ttacggatgg catgacagta agagaattat 4620
gcagtgctgc cataaccatg agtgataaca ctgcggccaa cttacttctg acaacgatcg 4680
gaggaccgaa ggagctaacc gcttttttgc acaacatggg ggatcatgta actcgccttg 4740
atcgttggga accggagctg aatgaagcca taccaaacga cgagcgtgac accacgatgc 4800
ctgtagcaat ggcaacaacg ttgcgcaaac tattaactgg cgaactactt actctagctt 4860
cccggcaaca attaatagac tggatggagg cggataaagt tgcaggacca cttctgcgct 4920
cggcccttcc ggctggctgg tttattgctg ataaatctgg agccggtgag cgtgggtctc 4980
gcggtatcat tgcagcactg gggccagatg gtaagccctc ccgtatcgta gttatctaca 5040
cgacggggag tcaggcaact atggatgaac gaaatagaca gatcgctgag ataggtgcct 5100
cactgattaa gcattggtaa ctgtcagacc aagtttactc atatatactt tagattgatt 5160
taccccggtt gataatcaga aaagccccaa aaacaggaag attgtataag caaatattta 5220
aattgtaaac gttaatattt tgttaaaatt cgcgttaaat ttttgttaaa tcagctcatt 5280
ttttaaccaa taggccgaaa tcggcaaaat cccttataaa tcaaaagaat agcccgagat 5340
agggttgagt gttgttccag tttggaacaa gagtccacta ttaaagaacg tggactccaa 5400
cgtcaaaggg cgaaaaaccg tctatcaggg cgatggccca ctacgtgaac catcacccaa 5460
atcaagtttt ttggggtcga ggtgccgtaa agcactaaat cggaacccta aagggagccc 5520
ccgatttaga gcttgacggg gaaagccggc gaacgtggcg agaaaggaag ggaagaaagc 5580
gaaaggagcg ggcgctaggg cgctggcaag tgtagcggtc acgctgcgcg taaccaccac 5640
acccgccgcg cttaatgcgc cgctacaggg cgcgtaaaag gatctaggtg aagatccttt 5700
ttgataatct catgaccaaa atcccttaac gtgagttttc gttccactga gcgtcagacc 5760
ccgtagaaaa gatcaaagga tcttcttgag atcctttttt tctgcgcgta atctgctgct 5820
tgcaaacaaa aaaaccaccg ctaccagcgg tggtttgttt gccggatcaa gagctaccaa 5880
ctctttttcc gaaggtaact ggcttcagca gagcgcagat accaaatact gtccttctag 5940
tgtagccgta gttaggccac cacttcaaga actctgtagc accgcctaca tacctcgctc 6000
tgctaatcct gttaccagtg gctgctgcca gtggcgataa gtcgtgtctt accgggttgg 6060
actcaagacg atagttaccg gataaggcgc agcggtcggg ctgaacgggg ggttcgtgca 6120
cacagcccag cttggagcga acgacctaca ccgaactgag atacctacag cgtgagctat 6180
gagaaagcgc cacgcttccc gaagggagaa aggcggacag gtatccggta agcggcaggg 6240
tcggaacagg agagcgcacg agggagcttc cagggggaaa cgcctggtat ctttatagtc 6300
ctgtcgggtt tcgccacctc tgacttgagc gtcgattttt gtgatgctcg tcaggggggc 6360
ggagcctatg gaaaaacgcc agcaacgcgg cctttttacg gttcctggcc ttttgctggc 6420
cttttgctca catgttcttt cctgcgttat cccctgattc tgtggataac cgtattaccg 6480
cctttgagtg agctgatacc gctcgccgca gccgaacgac cgagcgcagc gagtcagtga 6540
gcgaggaagc ggaagagcgc ctgatgcggt attttctcct tacgcatctg tgcggtattt 6600
cacaccgcat atggtgcact ctcagtacaa tctgctctga tgccgcatag ttaagccagt 6660
atacactccg ctatcgctac gtgactgggt catggctgcg ccccgacacc cgccaacacc 6720
cgctgacgcg ccctgacggg cttgtctgct cccggcatcc gcttacagac aagctgtgac 6780
cgtctccggg agctgcatgt gtcagaggtt ttcaccgtca tcaccgaaac gcgcgaggca 6840
gctgcggtaa agctcatcag cgtggtcgtg cagcgattca cagatgtctg cctgttcatc 6900
cgcgtccagc tcgttgagtt tctccagaag cgttaatgtc tggcttctga taaagcgggc 6960
catgttaagg gcggtttttt cctgtttggt cacttgatgc ctccgtgtaa gggggaattt 7020
ctgttcatgg gggtaatgat accgatgaaa cgagagagga tgctcacgat acgggttact 7080
gatgatgaac atgcccggtt actggaacgt tgtgagggta aacaactggc ggtatggatg 7140
cggcgggacc agagaaaaat cactcagggt caatgccagc gcttcgttaa tacagatgta 7200
ggtgttccac agggtagcca gcagcatcct gcgatgcaga tccggaacat aatggtgcag 7260
ggcgctgact tccgcgtttc cagactttac gaaacacgga aaccgaagac cattcatgtt 7320
gttgctcagg tcgcagacgt tttgcagcag cagtcgcttc acgttcgctc gcgtatcggt 7380
gattcattct gctaaccagt aaggcaaccc cgccagccta gccgggtcct caacgacagg 7440
agcacgatca tgcgcacccg tggccaggac ccaacgctgc ccgaaatt 7488
<210>2
<211>671
<212>PRT
<213>人工序列
<220>
<223>
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Trp Ala Glu Thr Gly Gly Met Gly Leu Ala Val Arg Gln Ala Pro Leu
35 40 45
Ile Ile Pro Leu Lys Ala Thr Ser Thr Pro Val Ser Ile Lys Gln Tyr
50 55 60
Pro Met Ser Gln Glu Ala Arg Leu Gly Ile Lys Pro His Ile Gln Arg
65 70 75 80
Leu Leu Asp Ala Gly Ile Leu Val Pro Cys Gln Ser Pro Trp Asn Thr
85 90 95
Pro Leu Leu Pro Val Lys Lys Pro Gly Thr Asn Asp Tyr Arg Pro Val
100 105 110
Gln Asp Leu Arg Glu Val Asn Lys Arg Val Glu Asp Ile His Pro Thr
115 120 125
Val Pro Asn Pro Tyr Asn Leu Leu Ser Gly Leu Pro Pro Ser His Gln
130 135 140
Trp Tyr Thr Val Leu Asp Leu Lys Asp Ala Val Phe Cys Leu Arg Leu
145 150 155 160
His Pro Thr Ser Gln Pro Leu Phe Ala Phe Glu Trp Arg Asp Pro Glu
165 170 175
Met Gly Ile Ser Gly Gln Leu Thr Trp Thr Arg Leu Pro Gln Gly Phe
180 185 190
Lys Asn Ser Pro Thr Leu Phe Asp Glu Ala Leu His Arg Asp Leu Ala
195 200 205
Asp Phe Arg Ile Gln His Pro Asp Leu Ile Leu Leu Gln Tyr Val Asp
210 215 220
Asp Leu Leu Leu Ala Ala Thr Ser Glu Leu Asp Cys Gln Gln Gly Thr
225 230 235 240
Arg Ala Leu Leu Gln Thr Leu Gly Asn Leu Gly Tyr Arg Ala Ser Ala
245 250 255
Lys Lys Ala Gln Ile Cys Gln Lys Gln Val Lys Tyr Leu Gly Tyr Leu
260 265 270
Leu Lys Glu Gly Gln Arg Trp Leu Thr Glu Ala Arg Lys Glu Thr Val
275 280 285
Met Gly Gln Pro Thr Pro Lys Thr Pro Arg Gln Leu Arg Glu Phe Leu
290 295 300
Gly Thr Ala Gly Phe Cys Arg Leu Trp Ile Pro Gly Phe Ala Glu Met
305 310 315 320
Ala Ala Pro Leu Tyr Pro Leu Thr Lys Thr Gly Thr Leu Phe Asn Trp
325 330 335
Gly Pro Asp Gln Gln Lys Ala Tyr Gln Glu Ile Lys Gln Ala Leu Leu
340 345 350
Thr Ala Pro Ala Leu Gly Leu Pro Asp Leu Thr Lys Pro Phe Glu Leu
355 360 365
Phe Val Asp Glu Lys Gln Gly Tyr Ala Lys Gly Val Leu Thr Gln Lys
370 375 380
Leu Gly Pro Trp Arg Arg Pro Val Ala Tyr Leu Ser Lys Lys Leu Asp
385 390 395 400
Pro Val Ala Ala Gly Trp Pro Pro Cys Leu Arg Met Val Ala Ala Ile
405 410 415
Ala Val Leu Thr Lys Asp Ala Gly Lys Leu Thr Met Gly Gln Pro Leu
420 425 430
Val Ile Leu Ala Pro His Ala Val Glu Ala Leu Val Lys Gln Pro Pro
435 440 445
Asp Arg Trp Leu Ser Asn Ala Arg Met Thr His Tyr Gln Ala Leu Leu
450 455 460
Leu Asp Thr Asp Arg Val Gln Phe Gly Pro Val Val Ala Leu Asn Pro
465 470 475 480
Ala Thr Leu Leu Pro Leu Pro Glu Glu Gly Leu Gln His Asn Cys Leu
485 490 495
Asp Ile Leu Ala Glu Ala His Gly Thr Arg Pro Asp Leu Thr Asp Gln
500 505 510
Pro Leu Pro Asp Ala Asp His Thr Trp Tyr Thr Asn Gly Ser Ser Leu
515 520 525
Leu Gln Glu Gly Gln Arg Lys Ala Gly Ala Ala Val Thr Thr Glu Thr
530 535 540
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545 550 555 560
Ala Glu Leu Ile Ala Leu Thr Gln Ala Leu Lys Met Ala Glu Gly Lys
565 570 575
Lys Leu Asn Val Tyr Thr Asp Ser Arg Tyr Ala Phe Ala Thr Ala His
580 585 590
Ile His Gly Glu Ile Tyr Arg Arg Arg Gly Leu Leu Thr Ser Glu Gly
595 600 605
Lys Glu Ile Lys Asn Lys Asp Glu Ile Leu Ala Leu Leu Lys Ala Leu
610 615 620
Phe Leu Pro Lys Arg Leu Ser Ile Ile His Cys Pro Gly His Gln Lys
625 630 635 640
Gly His Ser Ala Glu Ala Arg Gly Asn Arg Met Ala Asp Gln Ala Ala
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Arg Lys Ala Ala Ile Thr Glu Thr Pro Asp Thr Ser Thr Leu Leu
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<210>3
<211>671
<212>PRT
<213>小鼠白血病病毒(Murine Leukemia Virus)
<400>3
Thr Leu Asn Ile Glu Asp Glu His Arg Leu His Glu Thr Ser Lys Glu
1 5 10 15
Pro Asp Val Ser Leu Gly Ser Thr Trp Leu Ser Asp Phe Pro Gln Ala
20 25 30
Trp Ala Glu Thr Gly Gly Met Gly Leu Ala Val Arg Gln Ala Pro Leu
35 40 45
Ile Ile Pro Leu Lys Ala Thr Ser Thr Pro Val Ser Ile Lys Gln Tyr
50 55 60
Pro Met Ser Gln Glu Ala Arg Leu Gly Ile Lys Pro His Ile Gln Arg
65 70 75 80
Leu Leu Asp Gln Gly Ile Leu Val Pro Cys Gln Ser Pro Trp Asn Thr
85 90 95
Pro Leu Leu Pro Val Lys Lys Pro Gly Thr Asn Asp Tyr Arg Pro Val
100 105 110
Gln Asp Leu Arg Glu Val Asn Lys Arg Val Glu Asp Ile His Pro Thr
115 120 125
Val Pro Asn Pro Tyr Asn Leu Leu Ser Gly Leu Pro Pro Ser His Gln
130 135 140
Trp Tyr Thr Val Leu Asp Leu Lys Asp Ala Phe Phe Cys Leu Arg Leu
145 150 155 160
His Pro Thr Ser Gln Pro Leu Phe Ala Phe Glu Trp Arg Asp Pro Glu
165 170 175
Met Gly Ile Ser Gly Gln Leu Thr Trp Thr Arg Leu Pro Gln Gly Phe
180 185 190
Lys Asn Ser Pro Thr Leu Phe Asp Glu Ala Leu His Arg Asp Leu Ala
195 200 205
Asp Phe Arg Ile Gln His Pro Asp Leu Ile Leu Leu Gln Tyr Val Asp
210 215 220
Asp Leu Leu Leu Ala Ala Thr Ser Glu Leu Asp Cys Gln Gln Gly Thr
225 230 235 240
Arg Ala Leu Leu Gln Thr Leu Gly Asn Leu Gly Tyr Arg Ala Ser Ala
245 250 255
Lys Lys Ala Gln Ile Cys Gln Lys Gln Val Lys Tyr Leu Gly Tyr Leu
260 265 270
Leu Lys Glu Gly Gln Arg Trp Leu Thr Glu Ala Arg Lys Glu Thr Val
275 280 285
Met Gly Gln Pro Thr Pro Lys Thr Pro Arg Gln Leu Arg Glu Phe Leu
290 295 300
Gly Thr Ala Gly Phe Cys Arg Leu Trp Ile Pro Gly Phe Ala Glu Met
305 310 315 320
Ala Ala Pro Leu Tyr Pro Leu Thr Lys Thr Gly Thr Leu Phe Asn Trp
325 330 335
Gly Pro Asp Gln Gln Lys Ala Tyr Gln Glu Ile Lys Gln Ala Leu Leu
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Thr Ala Pro Ala Leu Gly Leu Pro Asp Leu Thr Lys Pro Phe Glu Leu
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Phe Val Asp Glu Lys Gln Gly Tyr Ala Lys Gly Val Leu Thr Gln Lys
370 375 380
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385 390 395 400
Pro Val Ala Ala Gly Trp Pro Pro Cys Leu Arg Met Val Ala Ala Ile
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Ala Val Leu Thr Lys Asp Ala Gly Lys Leu Thr Met Gly Gln Pro Leu
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Val Ile Leu Ala Pro His Ala Val Glu Ala Leu Val Lys Gln Pro Pro
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Glu Val Ile Trp Ala Lys Ala Leu Pro Ala Gly Thr Ser Ala Gln Arg
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565 570 575
Lys Leu Asn Val Tyr Thr Asp Ser Arg Tyr Ala Phe Ala Thr Ala His
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Phe Leu Pro Lys Arg Leu Ser Ile Ile His Cys Pro Gly His Gln Lys
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Gly His Ser Ala Glu Ala Arg Gly Asn Arg Met Ala Asp Gln Ala Ala
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Arg Lys Ala Ala Ile Thr Glu Thr Pro Asp Thr Ser Thr Leu Leu
660 665 670
Claims (10)
1、小鼠白血病病毒逆转录酶突变体,是将小鼠白血病病毒逆转录酶的自N端第155位苯丙氨酸残基取代为缬氨酸、自N端第524位天门冬氨酸残基取代为天门冬酰胺残基和自N端第84位谷氨酰胺残基取代为氨基酸残基X的蛋白质,其中X为侧链短于谷氨酰胺侧链的氨基酸。
2、根据权利要求1所述的小鼠白血病病毒逆转录酶突变体,其特征在于:所述X为丙氨酸、天门冬酰胺、天门冬氨酸或丝氨酸。
3、根据权利要求2所述的小鼠白血病病毒逆转录酶突变体,其特征在于:所述X为丙氨酸;所述小鼠白血病病毒逆转录酶突变体具有序列表中序列2的氨基酸残基序列。
4、权利要求1至3中任一权利要求所述的小鼠白血病病毒逆转录酶突变体的编码基因。
5、根据权利要求4所述的编码基因,其特征在于:所述小鼠白血病病毒逆转录酶突变体具有序列表中序列2的氨基酸残基序列;所述小鼠白血病病毒逆转录酶突变体编码基因具有序列表中序列1的自5′端第1515位至第3527位脱氧核苷酸的核苷酸序列。
6、一种表达权利要求1所述的小鼠白血病病毒逆转录酶突变体的方法,是将含有权利要求1所述的小鼠白血病病毒逆转录酶突变体编码基因的表达载体转化到大肠杆菌中,培养阳性克隆,表达得到小鼠白血病病毒逆转录酶突变体。
7、根据权利要求6所述的方法,其特征在于:所述含有权利要求1所述的小鼠白血病病毒逆转录酶突变体编码基因的表达载体是具有序列表中序列1的核苷酸序列的质粒pTacRT-Q84A-F155V-D524N。
8、根据权利要求6或7所述的方法,其特征在于:所述大肠杆菌为Escherichiacoli BL21。
9、含有权利要求4或5所述的小鼠白血病病毒逆转录酶突变体的编码基因的表达载体,细胞系或宿主菌。
10、权利要求1至3中任一权利要求所述的小鼠白血病病毒逆转录酶突变体在合成RNA中的应用。
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US6136582A (en) * | 1998-01-20 | 2000-10-24 | The Trustees Of Columbia University In The City | Reverse transcriptase of moloney murine leukemia virus with RNA polymerase activity |
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CN114480329B (zh) * | 2020-11-13 | 2023-06-30 | 广州达安基因股份有限公司 | 高效率mmlv酶突变体 |
CN114480337B (zh) * | 2020-11-13 | 2023-07-28 | 广州达安基因股份有限公司 | 逆转录酶突变体及逆转录方法 |
CN114480334B (zh) * | 2020-11-13 | 2024-04-05 | 广州达安基因股份有限公司 | 用于新冠病毒检测的逆转录酶突变体 |
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