CN114875009A - 一个具有高催化活性的Ppmar1转座酶L477A-L479A突变体及其应用 - Google Patents
一个具有高催化活性的Ppmar1转座酶L477A-L479A突变体及其应用 Download PDFInfo
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- CN114875009A CN114875009A CN202210149044.5A CN202210149044A CN114875009A CN 114875009 A CN114875009 A CN 114875009A CN 202210149044 A CN202210149044 A CN 202210149044A CN 114875009 A CN114875009 A CN 114875009A
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- transposase
- ppmar1
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Abstract
本发明公开了一种具有高催化活性的Ppmar1转座酶L477A‑L479A突变体,所述的Ppmar1转座酶L477A‑L479A突变体的氨基酸序列如SEQ ID NO.1所示。编码所述Ppmar1转座酶L477A‑L479A突变体的基因的核苷酸序列如SEQ ID NO.2所示。是将野生型Ppmar1转座酶477和479位置上的两个亮氨酸突变为两个丙氨酸。该Ppmar1转座酶L477A‑L479A突变体催化转座子转座的活性是野生型转座酶的活性的2.96倍,为利用MLE转座子开发基因标签奠定了基础,为后基因组时代大规模分离和标记基因,研究基因的功能提供了新工具。
Description
技术领域
本发明属于生物技术领域,具体涉及一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体及其应用。
背景技术
转座子(transposon)是指在基因组上能从一个位点转移到另一个位点的一段DNA序列。自转座子被发现以来,随着人们在分子水平上对转座子结构和功能认识的不断深化,一些转座子已被改造为基因标签应用于基因分析,并逐渐成为大规模分离基因的重要手段之一。
Mariner-Like转座子(Mariner-Like Elements,MLE)是转座子中一个重要家族,最早是在研究毛里塔尼亚果蝇(Drosophila mauristiana) 白眼基因的一个不稳定突变时发现的。此后在其他动物以及植物基因组中也发现了大量MLE转座子的存在。与其它转座子相比较,MLE转座子具有结构简单、异源转座率高、在基因组插入位点接近随机等特点,在开发基因标签,分离基因,研究基因功能上,远远优于其他转座子。
MLE转座子由两端反向重复序列(Terminal Inverted Repeats,TIRs)和编码转座酶的基因组成,转座酶负责催化转座子转座,因此转座酶的活性是影响转座子的转座频率的主要因素。然而自然界分离的MLE转座酶由于在进化过程中 “垂直失活”效应积累了或多或少的突变,部分或全部丧失了催化转座能力,成为低活性或非活性的转座酶,严重影响了MLE转座子的应用,因此人工构建高活性的转座酶就显得十分重要。
发明内容
本发明的目的是提供一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体及其应用,解决了现有自然界分离的MLE转座酶催化活性较低或者不具备催化活性的问题。
本发明提供了一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体,所述的Ppmar1转座酶L477A-L479A突变体的氨基酸序列如SEQ ID NO.1所示。
本发明还提供了一种编码所述Ppmar1转座酶L477A-L479A突变体的基因,编码所述Ppmar1转座酶L477A-L479A突变体的基因的核苷酸序列如SEQ ID NO.2所示。
本发明还提供了一种重组质粒,所述重组质粒携带有编码所述Ppmar1转座酶L477A-L479A突变体的基因。
本发明还提供了一种工程菌株,所述工程菌株携带有上述重组质粒。
本发明还提供了一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体在构建酵母突变体中的应用。
与现有技术相比,本发明提供的一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体,具有以下有益效果:
本发明从毛竹(Phyllostachys pubescens)中克隆到的活性转座酶,对其进行人工改造之后获得较高活性的MLE转座酶突变体(Ppmar1转座酶L477A-L479A突变体),Ppmar1转座酶L477A-L479A突变体催化转座子转座的活性是野生型转座酶的活性的2.96倍,为利用MLE转座子开发基因标签奠定了基础,为后基因组时代大规模分离和标记基因,研究基因的功能提供了新工具。
具体实施方式
下面结合具体实施方式对本发明进行详细说明,但应当理解本发明的保护范围并不受具体实施方式的限制。下列实施例中未注明具体条件的试验方法,通常按照常规条件操作,如Sambrook等主编的《分子克隆实验指南》中所述条件,或按照试剂盒陈述的步骤进行操作,由于不涉及发明点,故不对其步骤进行详细描述。
当实施例给出数值范围时,应理解,除非本发明另有说明,每个数值范围的两个端点以及两个端点之间任何一个数值均可选用。除非另外定义,本发明中使用的所有技术和科学术语与本技术领域技术人员通常理解的意义相同。除实施例中使用的具体方法、设备、材料外,根据本技术领域的技术人员对现有技术的掌握及本发明的记载,还可以使用与本发明实施例中所述的方法、设备、材料相似或等同的现有技术的任何方法、设备和材料来实现本发明。
一、野生型MLE转座酶和去除转座酶的非自主性转座子的获得
步骤1.1,采集新鲜的毛竹叶片(Phyllostachys pubescens),采集于浙江农林大学植物园,北纬N30°15′14.67″ 东经E119°43′33.47″),利用CTAB法提取毛竹基因组DNA,根据MLE转座子TIR保守序列设计引物Ppmar1-5-3(Ppmar1-5-3的序列信息见表1),进行PCR扩增,得到MLE转座子扩增产物。
PCR扩增的体系为20µl,包括0.2µl rTaq Polymerase (5 U/µl),1µl Ppmar1-5-3(10µmol/L),2µl 10×rTaq Buffer(Mg2+ plus),1.6µl dNTP mix (2.5 mmol/L),100 ng毛竹基因组DNA,加无菌水补齐 20µl。
PCR扩增的反应条件为:预变性94 ℃ 5 min;变性94 ℃ 30 s,60 ℃ 30 s,延伸72 ℃ 40 s,35 个循环;72 ℃ 2 min,4 ℃ 10 min。
步骤1.2,扩增出序列后,采用TaKaRa公司pMD™18-T Vector Cloning Kit试剂盒的方法将步骤1.1的MLE转座子扩增产物连接到pMD18-T载体,测序确认后,命名为Ppmar1转座子。
步骤1.3,采用QIAGEN公司的 RNeasy Mini Kit试剂盒提取毛竹叶片RNA,通过Invitrogen公司 的SuperScript™ VILO™ cDNA Synthesis Kit试剂盒将RNA反转录为cDNA,根据Ppmar1转座酶序列设计一对引物PpTpase1-5和PpTpase1-3(PpTpase1-5和PpTpase1-3的序列信息见表1),进行PCR扩增,回收得到Ppmar1转座酶扩增产物,即为Ppmar1转座酶核苷酸序列。
PCR扩增的体系为20µl,包括0.2µl rTaq Polymerase (5 U/µl),0.5µlPpTpase1-5 (10µmol/L),0.5µl PpTpase1-3 (10µmol/L),2µl 10×rTaq Buffer(Mg2+plus),1.6µl dNTP mix (2.5 mmol/L),10 ng 毛竹叶片cDNA,加无菌水补齐 20µl。
PCR扩增的反应条件为:预变性94 ℃ 5 min;变性94 ℃ 30 s,55 ℃ 30 s,延伸72 ℃ 40 s,35 个循环;72 ℃ 2 min,4 ℃ 10 min。
步骤1.4,采用TaKaRa公司pMD™18-T Vector Cloning Kit试剂盒的方法将步骤1.3的Ppmar1转座酶核苷酸序列连接到pMD18-T载体克隆,测序确认,Ppmar1转座酶核苷酸序列和相应的氨基酸序列分别如SEQ ID NO. 3和 SEQ ID NO. 4所示。
将含有Ppmar1转座子全长序列的pMD18-T载体用BseR I切除Ppmar1中间转座酶的大部分序列。
酶切体系为50µl,包括5µl 10×buffer,1µl BseR I (1U/µl),1µg质粒(含有Ppmar1全长序列的pMD18-T载体),加无菌水补齐 50µl,37 ℃温浴6小时。回收质粒大片段,用T4 DNA Ligase将质粒大片段自连接,得到连接到pMD18-T载体的Ppmar1非自主性转座子--Ppmar1NA。
其中,自连接的体系为10µl,包括1µl 10×T4 DNA Ligase buffer,1µl T4 DNALigase(10U/µl), 50ng质粒大片段,加无菌水补齐 10µl,16 ℃温浴8小时。
Ppmar1NA的序列如SEQ ID NO. 5所示。
二、酵母转座表达载体的构建
步骤2.1,Ppmar1转座酶表达载体的构建
将步骤1.3的Ppmar1 转座酶核苷酸序列经Not I和EcoR V双酶切,回收Ppmar1转座酶酶切产物的大片段;将 pAG413-gal-ccdB载体经Not I和EcoR V双酶切,回收pAG413-gal-ccdB载体酶切产物的大片段;且Ppmar1 转座酶核苷酸序列的双酶切体系、双酶切条件与pAG413-gal-ccdB载体的双酶切体系、双酶切条件均相同;
其中双酶切体系为50µl,包括5µl 10×buffer,1µl Not I (1U/µl), 1µl EcoR V (1U/µl),1µg质粒(Ppmar1 转座酶核苷酸序列或者pAG413-gal-ccdB载体),加无菌水补齐50µl,双酶切条件为:37 ℃温浴6小时。
将Ppmar1转座酶酶切产物的大片段和pAG413-gal-ccdB载体酶切产物的大片段相连接;
连接体系为10µl ,包括1µl 10×T4 DNA Ligase buffer,1µl T4 DNA Ligase(10U/µl), 50ng pAG413-gal-ccdB载体酶切产物的大片段,20ng Ppmar1转座酶酶切产物的大片段,加无菌水补齐 10µl,16 ℃温浴8小时。
此时完成了用Ppmar1转座酶核苷酸序列替换pAG413-gal-ccdB质粒中的ccdB核苷酸序列,得到重组质粒pAG413-gal-Tpase(Tpase表示转座酶);
该重组质粒pAG413-gal-Tpase即为Ppmar1转座酶表达载体,其携带有编码所述Ppmar1转座酶的基因。该表达载体具有His(组氨酸)筛选标记,使导入pAG413-gal-Tpase载体的宿主能够缺乏His的缺失培养基上生长。
步骤2.2,Ppmar1非自主转座子供体载体的构建
以步骤1.4的Ppmar1的非自主性转座子pMD18-T-Ppmar1NA为模板,利用Ppmar1-5-3引物扩增Ppmar1NA,进行PCR扩增,得到Ppmar1NA扩增产物。
PCR扩增的体系为20µl,包括0.2µl rTaq Polymerase ( 5 U/µl),1µl Ppmar1-5-3 (10µmol/L),2µl 10×rTaq Buffer(Mg2+ plus),1.6µl dNTP mix (2.5 mmol/L),10 ngpMD18-T-Ppmar1NA,加无菌水补齐 20µl。
PCR扩增的反应条件为: 预变性94 ℃ 5 min;变性94 ℃ 30 s,60 ℃ 30 s,延伸72 ℃ 40 s,35 个循环;72 ℃ 2 min,4 ℃ 10 min。
同时,将载体pWL89a用XhoⅠ 酶切(酶切位点位于ADE2基因内),回收载体pWL89a骨架。酶切体系为50µl,包括5µl 10×buffer,1µl XhoⅠ (1U/µl), 1µg 载体pWL89a,加无菌水补齐 50µl,37 ℃温浴6小时。
然后用In-Fusion Advantage PCR Cloning Kit(TaKaRa公司,日本)将Ppmar1NA扩增产物插入到载体pWL89a骨架的ADE2基因中,导致报告基因ADE2插入失活,得到pWL89a-Ppmar1NA重组质粒,即为Ppmar1非自主转座子供体载体。若Ppmar1NA发生转座从ADE2基因上离开,那么ADE2基因阅读框得到回复。该载体具有URA3筛选标记,使导入pWL89a-Ppmar1NA的宿主能够在缺乏Ura(尿嘧啶)的缺失培养基上生长。
三、Ppmar1转座酶L477A-L479A突变体的获得
将Ppmar1转座酶核苷酸序列与其他植物MLE转座酶的核苷酸序列进行同源性比对,选取Ppmar1转座酶核苷酸序列477和479位置上的亮氨酸开展突变,计划将它们均突变为丙氨酸(L477A-L479A)。
步骤3.1,根据QuikChange™ Site-Directed Mutagenesis Kit(Stratagene公司,美国)试剂盒说明书,设计定点突变引物L477A-L479A-F和L477A-L479A-R(L477A-L479A-F和L477A-L479A-R的序列信息见表1),按照QuikChange™ Site-DirectedMutagenesis Kit试剂盒方法,以步骤2.1的重组质粒pAG413-gal-Tpase为模板,利用PfuTurbo™ DNA polymerase重新合成含有Ppmar1转座酶L477A-L479A突变体的质粒DNA;
步骤3.2,然后在合成的质粒DNA中加入2 μL的 Dpn I限制性内切酶,于37 ℃条件下反应5 min,将原始模板序列彻底降解。将新合成的质粒DNA测序确认后得到Ppmar1转座酶L477A-L479A突变体;
Ppmar1转座酶L477A-L479A突变体的氨基酸序列如SEQ ID NO.1所示,编码所述Ppmar1转座酶L477A-L479A突变体的基因的核苷酸序列如SEQ ID NO.2所示。
四、转座酶活性的检测
实验组是将步骤3.2的含有Ppmar1转座酶L477A-L479A突变体的质粒DNA和步骤2.2的pWL89a-Ppmar1NA重组质粒,用PEG/LiAc法共同转化到酵母中,用His/ Ura双缺固体培养基上进行选择培养。用半乳糖诱导转座酶表达,促使非自主转座子发生转座。
以野生型Ppmar1转座酶为对照组,步骤2.1的带有野生型的Ppmar1转座酶的重组质粒pAG413-gal-Tpase和步骤2.2的pWL89a-Ppmar1NA重组质粒,用PEG/LiAc法共同转化到酵母中,用His/ Ura双缺固体培养基上进行选择培养。用半乳糖诱导转座酶表达,促使非自主转座子发生转座。
实验组和对照组的经诱导培养的酵母用缺失His/Ura/Ade固体培养基上进行选择培养,计算培养基上长出的酵母菌斑。如果转座发生,pWL89a-Ppmar1NA重组质粒上的ADE2基因就能表达,因此阳性酵母株能够在缺乏腺嘌呤的培养基上生长。
以野生型Ppmar1转座酶为对照,比较转化有Ppmar1转座酶L477A-L479A突变体的酵母菌落数目,筛选出较高活性的转座酶突变株,结果如表2所示。
由表2可知,野生型Ppmar1转座酶的阳性酵母菌落数量明显小于Ppmar1转座酶L477A-L479A突变体,且Ppmar1转座酶L477A-L479A突变体催化转座能力提高到原来的296%。这个高活性人工改造的Ppmar1转座酶L477A-L479A突变体将为利用Ppmar1转座子开发基因标签奠定了重要基础。
表1 本发明应用的引物序列
表2 不同转座酶诱导的阳性酵母菌落数量和催化活性
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。
序列表
<110> 周明兵
<120> 一个具有高催化活性的Ppmar1转座酶L477A-L479A突变体及其应用
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Glu Asp Asp Asp Gly Asn Leu Pro Phe Asp Leu Asn Glu Pro Ile Leu
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gaacaagatg ttgaggctcc cgttcaagta caccctccga agcatgacta tcctgaacat 240
gttagaaaac tagtgtacca agcattgttg atgagaagca agaatgggaa actaggcaat 300
catgatacaa caattgtttc cagtcaattt ggagtaaaga ttcgatcagt tcagcgcata 360
tggaagcaag gtaaaaacca acttgctcaa aacattccgg tcgtggttgc taatctaaag 420
aaaggtagaa gtggccgtaa agcaacccct cttgatttgg aacaattgcg caacattcct 480
ctcaagcaaa gaatgaccat agaagatgtg tctagtagac ttggtattag caaatctagg 540
atacaaaggt atttgaaaaa gggtttgctt aggcgccact ctagtagcat aaaaccttac 600
ctcaccgatg ctaacaagaa gactaggttg aagtggtgca ttgacatgat tgagcaaggt 660
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ttctacctct ctcaaaaatc cgagagatac tacttgctac ccgacgaaga tgaaccacat 780
cgcacttgca agaacaagaa ttacatccct aggatcatgt ttttgtgtgt ttgtgctcgg 840
ccaagattta gaaatggaga atgtgtgttt gatggcaaaa taggttgttt tccactagtc 900
acttttgaac aagctattag aggaagccaa aaccgtcttc gtggagaaca agtaatcaag 960
ccaattcaat caattaatag ggaagtgata agagatttca tgataaatag agtgttgcct 1020
gcaattagag caaagtggcc aagagaagat gtacacaagc caattttcat acaacaagat 1080
aatgttccat ctcatttaaa ggtggatgat cctcagtttc gtgaggttgc taagcaagat 1140
gggtttgaca ttaggctcat atgtcaacca cccaattctc cagattttaa cattctagat 1200
ttgggttttt ttcgagctat tcaagcaatt caatacaaga aagatgctaa gacattgaaa 1260
gatctaattc cagcagtcca acaggcattt ttggagtact ctccatggaa agcaaatagg 1320
atatttgtga cactacaaac tgttttgaag gaagcaatga agataaaagg ttgcaacaaa 1380
atcaaaattc ctcacatcca gaaacaaaga cttgagagag aagatagggc gccagcgcaa 1440
atcccttgtg aagcttcctt gctagccgaa gcacttgcaa gccttcctgc agctaattag 1500
<210> 3
<211> 1500
<212> DNA
<213> 毛竹(Phyllostachys pubescens)
<400> 3
atggctgacc caatagattc tggcttcgat ctgaacgttc ggttagaaga agatgatgac 60
ggcaatcttc cctttgatct caacgagcca atattggaag atcacaacaa tggaattgat 120
ttgaacttgc cattagatga gtttggtgcc gtcgacttcg actatgtaca aaacctcgct 180
gaacaagatg ttgaggctcc cgttcaagta caccctccga agcatgacta tcctgaacat 240
gttagaaaac tagtgtacca agcattgttg atgagaagca agaatgggaa actaggcaat 300
catgatacaa caattgtttc cagtcaattt ggagtaaaga ttcgatcagt tcagcgcata 360
tggaagcaag gtaaaaacca acttgctcaa aacattccgg tcgtggttgc taatctaaag 420
aaaggtagaa gtggccgtaa agcaacccct cttgatttgg aacaattgcg caacattcct 480
ctcaagcaaa gaatgaccat agaagatgtg tctagtagac ttggtattag caaatctagg 540
atacaaaggt atttgaaaaa gggtttgctt aggcgccact ctagtagcat aaaaccttac 600
ctcaccgatg ctaacaagaa gactaggttg aagtggtgca ttgacatgat tgagcaaggt 660
ttggttgatg atccaaagtt cagggatttg tttgactttg tgtttattga tgagaagtgg 720
ttctacctct ctcaaaaatc cgagagatac tacttgctac ccgacgaaga tgaaccacat 780
cgcacttgca agaacaagaa ttacatccct aggatcatgt ttttgtgtgt ttgtgctcgg 840
ccaagattta gaaatggaga atgtgtgttt gatggcaaaa taggttgttt tccactagtc 900
acttttgaac aagctattag aggaagccaa aaccgtcttc gtggagaaca agtaatcaag 960
ccaattcaat caattaatag ggaagtgata agagatttca tgataaatag agtgttgcct 1020
gcaattagag caaagtggcc aagagaagat gtacacaagc caattttcat acaacaagat 1080
aatgttccat ctcatttaaa ggtggatgat cctcagtttc gtgaggttgc taagcaagat 1140
gggtttgaca ttaggctcat atgtcaacca cccaattctc cagattttaa cattctagat 1200
ttgggttttt ttcgagctat tcaagcaatt caatacaaga aagatgctaa gacattgaaa 1260
gatctaattc cagcagtcca acaggcattt ttggagtact ctccatggaa agcaaatagg 1320
atatttgtga cactacaaac tgttttgaag gaagcaatga agataaaagg ttgcaacaaa 1380
atcaaaattc ctcacatcca gaaacaaaga cttgagagag aagataggct gccattgcaa 1440
atcccttgtg aagcttcctt gctagccgaa gcacttgcaa gccttcctgc agctaattag 1500
<210> 4
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<212> PRT
<213> 毛竹(Phyllostachys pubescens)
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Lys Ile Arg Ser Val Gln Arg Ile Trp Lys Gln Gly Lys Asn Gln Leu
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Leu Lys Gln Arg Met Thr Ile Glu Asp Val Ser Ser Arg Leu Gly Ile
165 170 175
Ser Lys Ser Arg Ile Gln Arg Tyr Leu Lys Lys Gly Leu Leu Arg Arg
180 185 190
His Ser Ser Ser Ile Lys Pro Tyr Leu Thr Asp Ala Asn Lys Lys Thr
195 200 205
Arg Leu Lys Trp Cys Ile Asp Met Ile Glu Gln Gly Leu Val Asp Asp
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Pro Lys Phe Arg Asp Leu Phe Asp Phe Val Phe Ile Asp Glu Lys Trp
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260 265 270
Met Phe Leu Cys Val Cys Ala Arg Pro Arg Phe Arg Asn Gly Glu Cys
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Val Phe Asp Gly Lys Ile Gly Cys Phe Pro Leu Val Thr Phe Glu Gln
290 295 300
Ala Ile Arg Gly Ser Gln Asn Arg Leu Arg Gly Glu Gln Val Ile Lys
305 310 315 320
Pro Ile Gln Ser Ile Asn Arg Glu Val Ile Arg Asp Phe Met Ile Asn
325 330 335
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370 375 380
Arg Leu Ile Cys Gln Pro Pro Asn Ser Pro Asp Phe Asn Ile Leu Asp
385 390 395 400
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Ala Ala Asn
<210> 5
<211> 779
<212> DNA
<213> 毛竹(Phyllostachys pubescens)
<400> 5
tactccctcc atacccgaaa ttcctgacgt ttaggacatg attgtggtaa ccaaggagtg 60
attaattagg ggttagtttt ccatctttgc ccctaataaa tatggttacg ggtgctcttt 120
gtacgagaaa gtaaaccagc tcgactggct agcgcgcgga ggcctcagtc ctgtggtgcg 180
cgttcgatac ctcgcggacg caggtttttt tcttgttgct gtttattcat ttttgcatgg 240
cactgtttag gcaacgcacg tcgcgcgcgc ttagccgctg cgggcgttag ttttcgagtg 300
gatttgggcc tggcgcacgg aggaggttgc atggctccgg cagctcctcg acggagtctg 360
gcacctcctg cggcgccatg tccacggtgt ccagcgacgc tatggagccc gacgagatgt 420
cctgcacggc gacgtccagc gccgcaacgg actccgtcgt ttccatctga tccgacgagg 480
catcgacgtc ctgcgacgag cgtggcggcg agagcacggc gagcgggcag gcgagcgggc 540
aggcgagcga gccattcgcg cgagcgatga atgcgagctg ctgtaccagg cgcacacacg 600
cgcaatcaat gcgggcgagt aacgatgcga gcatgcgcgg cggaagcgca acagacgggc 660
agcagcgcat ggccaggggc aaacgcgtga aaagaagacc acgcgaggcc acaacgtcag 720
cttttgcgca aacgggcact tcgcctagaa cgtcaggaat ttcgggtatg gagggagta 779
Claims (5)
1.一种具有高催化活性的Ppmar1转座酶L477A-L479A突变体,其特征在于,所述的转座酶L477A-L479A突变体的氨基酸序列如SEQ ID NO.1所示。
2.一种编码所述Ppmar1转座酶L477A-L479A突变体的基因,其特征在于,编码所述转座酶L477A-L479A突变体的基因的核苷酸序列如SEQ ID NO.2所示。
3.一种重组质粒,其特征在于,所述重组质粒携带有权利要求2所述的编码所述Ppmar1转座酶L477A-L479A突变体的基因。
4.一种工程菌株,其特征在于,所述工程菌株携带有权利要求3所述的重组质粒。
5.根据权利要求1所述的具有高催化活性的Ppmar1转座酶L477A-L479A突变体在构建酵母突变体中的应用。
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