CN110878290A - II类V型CRISPR蛋白BfCas12a及其在基因编辑的应用 - Google Patents

II类V型CRISPR蛋白BfCas12a及其在基因编辑的应用 Download PDF

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CN110878290A
CN110878290A CN201911121003.XA CN201911121003A CN110878290A CN 110878290 A CN110878290 A CN 110878290A CN 201911121003 A CN201911121003 A CN 201911121003A CN 110878290 A CN110878290 A CN 110878290A
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殷雷
陈鹏
周进
万义彬
刘欢
宋广济
刘昭鑫
雷骏
王宏健
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Abstract

本发明属于生物医学领域,具体涉及一种来自于Butyrivibrio fibrisolvens MD2001细菌中的II类V型CRISPR蛋白BfCas12a及其应用。所述BfCas12a的氨基酸序列如SEQ ID NO.1所示;其编码核苷酸序列如SED ID NO.2所示。本发明首次在Butyrivibrio fibrisolvens MD2001菌株中鉴定出具有基因编辑效应的II类V型CRISPR蛋白BfCas12a;所述BfCas12a能够在crRNA的介导下定点对原核生物和真核生物基因组进行基因编辑,BfCas12a的发现进一步扩大了基因编辑工具的种类,对基础科研和临床治疗具有十分重要的作用。

Description

II类V型CRISPR蛋白BfCas12a及其在基因编辑的应用
技术领域
本发明属于生物医学领域,具体涉及一种来自于Butyrivibrio fibrisolvensMD2001细菌中的II类V型CRISPR蛋白Cas12a,命名为BfCas12a,在基因编辑中的应用。
背景技术
自2013年以来,基因编辑技术取得了突破性进展,此项技术已经在基础科学研究、医药、临床、生物技术等许多领域引起了新的变革。除了具有代表性的Cas9系统之外,Cas12,又名Cpf1,作为又一种被发现的具有基因编辑效应的CRISPR系统新成员,极大的扩大了基因编辑系统靶点的可编辑范围,相比于Cas9系统,Cas12a所具有的加工前提RNA的功能,为其介导多基因编辑提供了相比与Cas9系统更为便捷高效的编辑能力。除此之外,相比于 Cas9的向导RNA,Cas12a的向导RNA组成更为简单,设计更为方便。
2015年,张峰团队首次发现了Cas9系统之外的另外一种具有基因编辑能力的新成员, Cas12a,又名Cpf1,将其划分到CRISPR系统2类V型中。相比于Cas9系统,Cas12a的编辑效率与Cas9的效率相当,在有些靶点低于Cas9。Cas12a的脱靶率极低,相比于Cas9脱靶率高的特性,Cas12a是一种安全的基因编辑工具。Cas12a在切割之后形成粘性末端,而 Cas9形成平末端,已有研究表明,Cas12a切割之后的粘性末端相比于Cas9的平末端而言,更容易发生同源重组修复,这也为基因的定点插入和修复提供了更好的工具。在向导RNA 的加工方面,Cas12a具有明显的优势,仅仅只需要Cas12a本身就能够完成对前提RNA的加工,而Cas9系统则需要RNaseIII的加工,这极大地促进Cas12a在多基因编辑上的应用。在 PAM的识别上,Cas12a识别5—TTTN—3或5—KYTV—3,Cas9则识别5—NGG—3.
因此,Cas12a作为一种新型基因编辑工具,与Cas9系统一道,为科学研究和疾病的治疗提供了有力的工具。基于对目前已有的Cas12a的研究,为应对将来各种情况下的基因编辑事件,发现更多的具有一定特性的Cas12a是一件具有重要意义的事情。
发明内容
本发明针对现有技术的不足,目的在于提供一种来自于Butyrivibriofibrisolvens MD2001 细菌中的II类V型CRISPR蛋白BfCas12a及其在基因编辑中的应用。
为实现上述发明目的,本发明所采用的技术方案为:
一种来自于Butyrivibrio fibrisolvens MD2001细菌中的II类V型CRISPR蛋白BfCas12a,其氨基酸序列如SED ID NO.1所示。
上述方案中,所述BfCas12a识别的PAM序列为TTTV、TCTA、TTCA、TCCA、CTTA、或CCTA,更为优选的PAM序列为TTTV,所述V表示A、C、或G。
用于编辑蛋白BfCas12a氨基酸序列的基因,其核苷酸序列如SEQ ID NO.2所示。
上述BfCas12a在基因编辑中的应用。
上述BfCas12a在原核生物基因编辑中的应用。
上述BfCas12a在真核生物基因编辑中的应用。
上述BfCas12a在体外基因编辑中的应用。
本发明中所述蛋白BfCas12a的氨基酸序列如下:
(1)在原核细胞中:
YYESLTKLYPIKKTIRNELVPIGKTLENIKKNNILEADEDRKIAYIRVKAIMDDYHKRLINEA LSGFALIDLDKAANLYLSRSKSADDIESFSRFQDKLRKAIAKRLREHENFGKIGNKDIIPLLQ KLSENEDDYNALESFKNFYTYFESYNDVRLNLYSDKEKSSTVAYRLINENLPRFLDNIRAYD AVQKAGITSEELSSEAQDGLFLVNTFNNVLIQDGINTYNEDIGKLNVAINLYNQKNASVQGF RKVPKMKVLYKQILSDREESFIDEFESDTELLDSLESHYANLAKYFGSNKVQLLFTALRESK GVNVYVKNDIAKTSFSNVVFGSWSRIDELINGEYDDNNNRKKDEKYYDKRQKELKKNKS YTIEKIITLSTEDVDVIGKYIEKLESDIDDIRFKGKNFYEAVLCGHDRSKKLSKNKGAVEAIK GYLDSVKDFERDLKLINGSGQELEKNLVVYGEQEAVLSELSGIDSLYNMTRNYLTKKPFST EKIKLNFNKPTFLDGWDYGNEEAYLGFFMIKEGNYFLAVMDANWNKEFRNIPSVDKSDCY KKVIYKQISSPEKSIQNLMVIDGKTVKKNGRKEKEGIHSGENLILEELKNTYLPKKINDIRK RRSYLNGDTFSKKDLTEFIGYYKQRVIEYYNGYSFYFKSDDDYASFKEFQEDVGRQAYQIS YVDVPVSFVDDLINSGKLYLFRVYNKDFSEYSKGRLNLHTLYFKMLFDERNLKNVVYKLN GQAEVFYRPSSIKKEELIVHRAGEEIKNKNPKRAAQKPTRRLDYDIVKDRRYSQDKFMLHT SIIMNFGAEENVSFNDIVNGVLRNEDKVNVIGIDRGERNLLYVVVIDPEGKILEQRSLNCITD SNLDIETDYHRLLDEKESDRKIARRDWTTIENIKELKAGYLSQVVHIVAELVLKYNAIICLE DLNFGFKRGRQKVEKQVYQKFEKMLIDKLNYLVMDKSREQLSPEKISGALNALQLTPDFK SFKVLGKQTGIIYYVPAYLTSKIDPMTGFANLFYVKYENVDKAKEFFSKFDSIKYNKDGKN WNTKGYFEFAFDYKKFTDRAYGRVSEWTVCTVGERIIKFKNKEKNNSYDDKVIDLTNSLK ELFDSYKVTYESEVDLKDAILAIDDPAFYRDLTRRLQQTLQMRNSSCDGSRDYIISPVKNSK GEFFCSDNNDDTTPNDADANGAFNIARKGLWVLNEIRNSEEGSKINLAMSNAQWLEYAQD NTI;
(2)真核细胞中:
PKKKRKVYYESLTKLYPIKKTIRNELVPIGKTLENIKKNNILEADEDRKIAYIRVKAIMDDYH KRLINEALSGFALIDLDKAANLYLSRSKSADDIESFSRFQDKLRKAIAKRLREHENFGKIGN KDIIPLLQKLSENEDDYNALESFKNFYTYFESYNDVRLNLYSDKEKSSTVAYRLINENLPRF LDNIRAYDAVQKAGITSEELSSEAQDGLFLVNTFNNVLIQDGINTYNEDIGKLNVAINLYNQ KNASVQGFRKVPKMKVLYKQILSDREESFIDEFESDTELLDSLESHYANLAKYFGSNKVQL LFTALRESKGVNVYVKNDIAKTSFSNVVFGSWSRIDELINGEYDDNNNRKKDEKYYDKRQ KELKKNKSYTIEKIITLSTEDVDVIGKYIEKLESDIDDIRFKGKNFYEAVLCGHDRSKKLSKN KGAVEAIKGYLDSVKDFERDLKLINGSGQELEKNLVVYGEQEAVLSELSGIDSLYNMTRNY LTKKPFSTEKIKLNFNKPTFLDGWDYGNEEAYLGFFMIKEGNYFLAVMDANWNKEFRNIPS VDKSDCYKKVIYKQISSPEKSIQNLMVIDGKTVKKNGRKEKEGIHSGENLILEELKNTYLPK KINDIRKRRSYLNGDTFSKKDLTEFIGYYKQRVIEYYNGYSFYFKSDDDYASFKEFQEDVG RQAYQISYVDVPVSFVDDLINSGKLYLFRVYNKDFSEYSKGRLNLHTLYFKMLFDERNLKN VVYKLNGQAEVFYRPSSIKKEELIVHRAGEEIKNKNPKRAAQKPTRRLDYDIVKDRRYSQD KFMLHTSIIMNFGAEENVSFNDIVNGVLRNEDKVNVIGIDRGERNLLYVVVIDPEGKILEQR SLNCITDSNLDIETDYHRLLDEKESDRKIARRDWTTIENIKELKAGYLSQVVHIVAELVLKY NAIICLEDLNFGFKRGRQKVEKQVYQKFEKMLIDKLNYLVMDKSREQLSPEKISGALNALQ LTPDFKSFKVLGKQTGIIYYVPAYLTSKIDPMTGFANLFYVKYENVDKAKEFFSKFDSIKYN KDGKNWNTKGYFEFAFDYKKFTDRAYGRVSEWTVCTVGERIIKFKNKEKNNSYDDKVIDL TNSLKELFDSYKVTYESEVDLKDAILAIDDPAFYRDLTRRLQQTLQMRNSSCDGSRDYIISP VKNSKGEFFCSDNNDDTTPNDADANGAFNIARKGLWVLNEIRNSEEGSKINLAMSNAQW LEYAQDNTIKRPAATKKAGQAKKKKGSYPYDVPDYA YPYDVPDYAYPYDVPDYA
其中在BfCas12a蛋白氨基酸序列的N端加入PKKKRKV序列(该序列为N端NLS入核序列),在BfCas12a蛋白氨基酸序列的C端加入KRPAATKKAGQAKKKK序列(该序列为C 端NLS入核序列),随后用GS序列连接YPYDVPDYAYPYDVPDYAYPYDVPDYA序列(该序列为3HA序列)。
编码本发明所述蛋白BfCas12a的核苷酸序列如下:
tactacgagagcctgaccaagctgtaccccatcaagaagaccatccgcaacgagctggtgcccatcggcaagaccctggagaacatcaagaagaacaacatcctg gaggccgacgaggaccgcaagatcgcctacatccgcgtgaaggccatcatggacgactaccacaagcgcctgatcaacgaggccctgagcggcttcgccctgat cgacctggacaaggccgccaacctgtacctgagccgcagcaagagcgccgacgacatcgagagcttcagccgcttccaggacaagctgcgcaaggccatcgcc aagcgcctgcgcgagcacgagaacttcggcaagatcggcaacaaggacatcatccccctgctgcagaagctgagcgagaacgaggacgactacaacgccctgg agagcttcaagaacttctacacctacttcgagagctacaacgacgtgcgcctgaacctgtacagcgacaaggagaagagcagcaccgtggcctaccgcctgatcaacgagaacctgccccgcttcctggacaacatccgcgcctacgacgccgtgcagaaggccggcatcaccagcgaggagctgagcagcgaggcccaggacggcc tgttcctggtgaacaccttcaacaacgtgctgatccaggacggcatcaacacctacaacgaggacatcggcaagctgaacgtggccatcaacctgtacaaccagaa gaacgccagcgtgcagggcttccgcaaggtgcccaagatgaaggtgctgtacaagcagatcctgagcgaccgcgaggagagcttcatcgacgagttcgagagc gacaccgagctgctggacagcctggagagccactacgccaacctggccaagtacttcggcagcaacaaggtgcagctgctgttcaccgccctgcgcgagagcaa gggcgtgaacgtgtacgtgaagaacgacatcgccaagaccagcttcagcaacgtggtgttcggcagctggagccgcatcgacgagctgatcaacggcgagtacg acgacaacaacaaccgcaagaaggacgagaagtactacgacaagcgccagaaggagctgaagaagaacaagagctacaccatcgagaagatcatcaccctga gcaccgaggacgtggacgtgatcggcaagtacatcgagaagctggagagcgacatcgacgacatccgcttcaagggcaagaacttctacgaggccgtgctgtgc ggccacgaccgcagcaagaagctgagcaagaacaagggcgccgtggaggccatcaagggctacctggacagcgtgaaggacttcgagcgcgacctgaagct gatcaacggcagcggccaggagctggagaagaacctggtggtgtacggcgagcaggaggccgtgctgagcgagctgagcggcatcgacagcctgtacaacat gacccgcaactacctgaccaagaagcccttcagcaccgagaagatcaagctgaacttcaacaagcccaccttcctggacggctgggactacggcaacgaggagg cctacctgggcttcttcatgatcaaggagggcaactacttcctggccgtgatggacgccaactggaacaaggagttccgcaacatccccagcgtggacaagagcga ctgctacaagaaggtgatctacaagcagatcagcagccccgagaagagcatccagaacctgatggtgatcgacggcaagaccgtgaagaagaacggccgcaag gagaaggagggcatccacagcggcgagaacctgatcctggaggagctgaagaacacctacctgcccaagaagatcaacgacatccgcaagcgccgcagctac ctgaacggcgacaccttcagcaagaaggacctgaccgagttcatcggctactacaagcagcgcgtgatcgagtactacaacggctacagcttctacttcaagagcg acgacgactacgccagcttcaaggagttccaggaggacgtgggccgccaggcctaccagatcagctacgtggacgtgcccgtgagcttcgtggacgacctgatc aacagcggcaagctgtacctgttccgcgtgtacaacaaggacttcagcgagtacagcaagggccgcctgaacctgcacaccctgtacttcaagatgctgttcgacg agcgcaacctgaagaacgtggtgtacaagctgaacggccaggccgaggtgttctaccgccccagcagcatcaagaaggaggagctgatcgtgcaccgcgccgg cgaggagatcaagaacaagaaccccaagcgcgccgcccagaagcccacccgccgcctggactacgacatcgtgaaggaccgccgctacagccaggacaagtt catgctgcacaccagcatcatcatgaacttcggcgccgaggagaacgtgagcttcaacgacatcgtgaacggcgtgctgcgcaacgaggacaaggtgaacgtgat cggcatcgaccgcggcgagcgcaacctgctgtacgtggtggtgatcgaccccgagggcaagatcctggagcagcgcagcctgaactgcatcaccgacagcaac ctggacatcgagaccgactaccaccgcctgctggacgagaaggagagcgaccgcaagatcgcccgccgcgactggaccaccatcgagaacatcaaggagctg aaggccggctacctgagccaggtggtgcacatcgtggccgagctggtgctgaagtacaacgccatcatctgcctggaggacctgaacttcggcttcaagcgcggc cgccagaaggtggagaagcaggtgtaccagaagttcgagaagatgctgatcgacaagctgaactacctggtgatggacaagagccgcgagcagctgagccccg agaagatcagcggcgccctgaacgccctgcagctgacccccgacttcaagagcttcaaggtgctgggcaagcagaccggcatcatctactacgtgcccgcctacc tgaccagcaagatcgaccccatgaccggcttcgccaacctgttctacgtgaagtacgagaacgtggacaaggccaaggagttcttcagcaagttcgacagcatcaa gtacaacaaggacggcaagaactggaacaccaagggctacttcgagttcgccttcgactacaagaagttcaccgaccgcgcctacggccgcgtgagcgagtgga ccgtgtgcaccgtgggcgagcgcatcatcaagttcaagaacaaggagaagaacaacagctacgacgacaaggtgatcgacctgaccaacagcctgaaggagct gttcgacagctacaaggtgacctacgagagcgaggtggacctgaaggacgccatcctggccatcgacgaccccgccttctaccgcgacctgacccgccgcctgc agcagaccctgcagatgcgcaacagcagctgcgacggcagccgcgactacatcatcagccccgtgaagaacagcaagggcgagttcttctgcagcgacaacaa cgacgacaccacccccaacgacgccgacgccaacggcgccttcaacatcgcccgcaagggcctgtgggtgctgaacgagatccgcaacagcgaggagggca gcaagatcaacctggccatgagcaacgcccagtggctggagtacgcccaggacaacaccatc
本发明中Butyrivibrio fibrisolvens MD2001细菌基因组中部分CRISPR array如图2所示,基因组中黑体显示CRISPR array序列为“ATCTACAACAGTAGAAATTATCTATAGGTTCTT GG”,因此,使用的crRNA direct repeat序列为5’-AATTTCTACTGTTGTAGAT-3’。
本发明的有益效果:本发明首次在Butyrivibrio fibrisolvens MD2001菌株中鉴定出具有基因编辑效应的II类V型CRISPR蛋白,命名为BfCas12a;所述BfCas12a能够在crRNA的介导下定点对原核生物和真核生物基因组进行基因编辑,BfCas12a的发现进一步扩大了基因编辑工具的种类,同时也为后续各种不同情况的基因编辑提供了重要的备选工具,对基础科研和临床治疗具有十分重要的作用。
附图说明
图1为Butyrivibrio fibrisolvens MD2001 CRISPR array及crRNA directrepeat图示。
图2为Butyrivibrio fibrisolvens MD2001菌株基因组中存在的部分CRISPRarray示意图。
图3为体外切割EGFP片段靶点示意图。
图4为原核表达BfCas12a之后,体外切割实验,S表示substrate;P表示product。
图5为体外实验验证BfCas12a的PAM,S表示substrate;P表示product。
图6为体内验证BfCas12a基因编辑,S表示substrate;P表示product。
图7为体内验证BfCas12a在相同基因不同靶点的基因编辑效率。
具体实施方式
为了更好地理解本发明,下面结合实施例进一步阐明本发明的内容,但本发明的内容不仅仅局限于下面的实施例。
实施例1
BfCas12a体外不同时间梯度切割实验,包括以下实验步骤:
(1)BfCas12a蛋白的表达与纯化:将BfCas12a基因序列合成到pet28a表达载体上,且在C末端加上6His标签,随后将合成好的质粒转化到E.Coli Rosseta 2(DE3)表达菌株中,挑取单克隆,小量表达检测确定蛋白表达后进行蛋白的大量表达与纯化;重组蛋白依次经过 Ni柱亲和层析,heparin柱层析,superdex 200分子筛纯化后,保存在buffer(10mMTris-HCl, 200mM NaCl,1mM MgCl)中,并冻存于-80℃备用;
(2)使用crRNA direct repeat序列为:5’-AATTTCTACTGTTGTAGAT-3’,在体外转录获得crRNA;将步骤(1)所得BfCas12a蛋白与crRNA混合得到BfCas12a-crRNA复合物;
(3)取100nM BfCas12a-crRNA所得复合物与300ng线性化的底物(图4所示)混匀,37℃孵育分别孵育0,1,2,5,10min后,加入适量蛋白酶K,58℃消化60min,跑2%琼脂糖胶,结果如图4所示,BfCas12a具有良好的体外切割能力。
实施例2
BfCas12a识别PAM的确定
(1)设计NNNN四个位置随机组合的上下游引物(N表示A、G、C、T),以EGFP片段作为模板,采用overlap PCR方法进行PCR,得到256种带有不同PAM序列,但spacer 序列一样的1.1kb的线性化底物;
(2)取100nM BfCas12a-crRNA复合物与300ng线性化的底物混匀,37℃孵育分别孵育10min后,加入适量蛋白酶K,58℃消化60min,跑2%琼脂糖胶,部分结果如图5所示,BfCas12a能够识别不同的PAM:TTTA、TCTA、TTCA、TCCA、CTTA、CCTA,但最优PAM 为TTTV(V表示A,C,G)。
实施例3
BfCas12a在哺乳动物细胞内不同基因的编辑:
(1)构建BfCas12a真核表达质粒:将BfCas12a基因序列合成到pet28a表达载体上构建BfCas12a真核表达质粒;
(2)在哺乳动物细胞中,以293T细胞为例选择TRAC、TRBC、B2M、CTLA4、PD1五个基因,分别以这五个基因为目标,构建5个U6-crRNA spacer真核表达质粒;
(3)分别针对这五个基因的切割靶点附近设计surveyor primer,并验证PCR引物的特异性;
(4)消化293T细胞,适当浓度铺24孔板,每孔500ul;
(5)24孔板共转BfCas12a真核表达质粒(700ng)和U6-crRNA spacer真核表达质粒(300ng),48h后裂解细胞,取1ul裂解液作为模板、以步骤(3)设计的surveyor primer引物进行PCR,纯化PCR产物;
(6)取300ng PCR产物与1ul 10XT7EI buffer混匀,按以下PCR程序进行复性95℃10min,95℃至85℃-2℃/S,85℃到25℃-0.25℃/S,25℃持续1min,复性之后产物加入 1ulT7EI,37℃酶切20min,跑2%琼脂糖胶,结果如图6所示在B2M、PD1能够进行基因编辑,(本案例中的基因只是作为代表进行列举,并不说明在其他基因上没有基因编辑的能力)。
实施例4
BfCas12a在哺乳动物细胞内相同基因不同靶点的基因编辑:
(1)选取并设计VEGFA基因上3个不同的靶点(VEGFA Site 1、VEGFA Site 2、VEGFASite 3)的crRNA;
(2)切割靶点附近设计surveyor primer,并验证PCR引物的特异性;
(3)消化293T细胞,适当浓度铺24孔板,每孔500ul;
(4)24孔板共转BfCas12a真核表达质粒(700ng)和U6-crRNA spacer真核表达质粒(300ng),48h后裂解细胞,取1ul裂解液作为模板、以步骤(3)设计的surveyor primer引物进行PCR,纯化PCR产物;
(5)取300ngPCR产物与1ul 10XT7EI buffer混匀,按以下PCR程序进行复性95℃10min,95℃至85℃-2℃/S,85℃到25℃-0.25℃/S,25℃持续1min。
(6)复性之后产物加入1ul T7EI,37℃酶切20min,跑2%琼脂糖胶,结果如图7所示,采用灰度分析可得在各个靶点切割效率分别为20%、34%、6%。
显然,上述实施例仅仅是为清楚地说明所作的实例,而并非对实施方式的限制。对于所属领域的普通技术人员来说,在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而因此所引申的显而易见的变化或变动仍处于本发明创造的保护范围之内。
序列表
<110>武汉大学
<120>II类V型CRISPR 蛋白BfCas12a及其用于基因编辑的应用
<160>2
<210> 1
<211> 1230
<212> PRT
<213>Butyrivibrio fibrisolvens MD2001 细菌
<400>1
Tyr Tyr Glu Ser Leu Thr Lys Leu Tyr Pro Ile Lys Lys Thr Ile Arg
1 5 10 15
Asn Glu Leu Val Pro Ile Gly Lys Thr Leu Glu Asn Ile Lys Lys Asn
20 25 30
Asn Ile Leu Glu Ala Asp Glu Asp Arg Lys Ile Ala Tyr Ile Arg Val
35 40 45
Lys Ala Ile Met Asp Asp Tyr His Lys Arg Leu Ile Asn Glu Ala Leu
50 55 60
Ser Gly Phe Ala Leu Ile Asp Leu Asp Lys Ala Ala Asn Leu Tyr Leu
65 70 75 80
Ser Arg Ser Lys Ser Ala Asp Asp Ile Glu Ser Phe Ser Arg Phe Gln
85 90 95
Asp Lys Leu Arg Lys Ala Ile Ala Lys Arg Leu Arg Glu His Glu Asn
100 105 110
Phe Gly Lys Ile Gly Asn Lys Asp Ile Ile Pro Leu Leu Gln Lys Leu
115 120 125
Ser Glu Asn Glu Asp Asp Tyr Asn Ala Leu Glu Ser Phe Lys Asn Phe
130 135 140
Tyr Thr Tyr Phe Glu Ser Tyr Asn Asp Val Arg Leu Asn Leu Tyr Ser
145 150 155 160
Asp Lys Glu Lys Ser Ser Thr Val Ala Tyr Arg Leu Ile Asn Glu Asn
165 170 175
Leu Pro Arg Phe Leu Asp Asn Ile Arg Ala Tyr Asp Ala Val Gln Lys
180 185 190
Ala Gly Ile Thr Ser Glu Glu Leu Ser Ser Glu Ala Gln Asp Gly Leu
195 200 205
Phe Leu Val Asn Thr Phe Asn Asn Val Leu Ile Gln Asp Gly Ile Asn
210 215 220
Thr Tyr Asn Glu Asp Ile Gly Lys Leu Asn Val Ala Ile Asn Leu Tyr
225 230 235 240
Asn Gln Lys Asn Ala Ser Val Gln Gly Phe Arg Lys Val Pro Lys Met
245 250 255
Lys Val Leu Tyr Lys Gln Ile Leu Ser Asp Arg Glu Glu Ser Phe Ile
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Asp Glu Phe Glu Ser Asp Thr Glu Leu Leu Asp Ser Leu Glu Ser His
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Tyr Ala Asn Leu Ala Lys Tyr Phe Gly Ser Asn Lys Val Gln Leu Leu
290 295 300
Phe Thr Ala Leu Arg Glu Ser Lys Gly Val Asn Val Tyr Val Lys Asn
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Asp Ile Ala Lys Thr Ser Phe Ser Asn Val Val Phe Gly Ser Trp Ser
325 330 335
Arg Ile Asp Glu Leu Ile Asn Gly Glu Tyr Asp Asp Asn Asn Asn Arg
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Lys Lys Asp Glu Lys Tyr Tyr Asp Lys Arg Gln Lys Glu Leu Lys Lys
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Asn Lys Ser Tyr Thr Ile Glu Lys Ile Ile Thr Leu Ser Thr Glu Asp
370 375 380
Val Asp Val Ile Gly Lys Tyr Ile Glu Lys Leu Glu Ser Asp Ile Asp
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Asp Ile Arg Phe Lys Gly Lys Asn Phe Tyr Glu Ala Val Leu Cys Gly
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His Asp Arg Ser Lys Lys Leu Ser Lys Asn Lys Gly Ala Val Glu Ala
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Ile Lys Gly Tyr Leu Asp Ser Val Lys Asp Phe Glu Arg Asp Leu Lys
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Leu Ile Asn Gly Ser Gly Gln Glu Leu Glu Lys Asn Leu Val Val Tyr
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Gly Glu Gln Glu Ala Val Leu Ser Glu Leu Ser Gly Ile Asp Ser Leu
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Tyr Asn Met Thr Arg Asn Tyr Leu Thr Lys Lys Pro Phe Ser Thr Glu
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Lys Ile Lys Leu Asn Phe Asn Lys Pro Thr Phe Leu Asp Gly Trp Asp
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Tyr Gly Asn Glu Glu Ala Tyr Leu Gly Phe Phe Met Ile Lys Glu Gly
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Asn Tyr Phe Leu Ala Val Met Asp Ala Asn Trp Asn Lys Glu Phe Arg
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Asn Ile Pro Ser Val Asp Lys Ser Asp Cys Tyr Lys Lys Val Ile Tyr
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Lys Gln Ile Ser Ser Pro Glu Lys Ser Ile Gln Asn Leu Met Val Ile
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Asp Gly Lys Thr Val Lys Lys Asn Gly Arg Lys Glu Lys Glu Gly Ile
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His Ser Gly Glu Asn Leu Ile Leu Glu Glu Leu Lys Asn Thr Tyr Leu
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Pro Lys Lys Ile Asn Asp Ile Arg Lys Arg Arg Ser Tyr Leu Asn Gly
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Asp Thr Phe Ser Lys Lys Asp Leu Thr Glu Phe Ile Gly Tyr Tyr Lys
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Gln Arg Val Ile Glu Tyr Tyr Asn Gly Tyr Ser Phe Tyr Phe Lys Ser
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Asp Asp Asp Tyr Ala Ser Phe Lys Glu Phe Gln Glu Asp Val Gly Arg
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Gln Ala Tyr Gln Ile Ser Tyr Val Asp Val Pro Val Ser Phe Val Asp
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Asp Leu Ile Asn Ser Gly Lys Leu Tyr Leu Phe Arg Val Tyr Asn Lys
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Asp Phe Ser Glu Tyr Ser Lys Gly Arg Leu Asn Leu His Thr Leu Tyr
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Phe Lys Met Leu Phe Asp Glu Arg Asn Leu Lys Asn Val Val Tyr Lys
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Leu Asn Gly Gln Ala Glu Val Phe Tyr Arg Pro Ser Ser Ile Lys Lys
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Glu Glu Leu Ile Val His Arg Ala Gly Glu Glu Ile Lys Asn Lys Asn
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Pro Lys Arg Ala Ala Gln Lys Pro Thr Arg Arg Leu Asp Tyr Asp Ile
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Val Lys Asp Arg Arg Tyr Ser Gln Asp Lys Phe Met Leu His Thr Ser
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Ile Ile Met Asn Phe Gly Ala Glu Glu Asn Val Ser Phe Asn Asp Ile
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Val Asn Gly Val Leu Arg Asn Glu Asp Lys Val Asn Val Ile Gly Ile
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Asp Arg Gly Glu Arg Asn Leu Leu Tyr Val Val Val Ile Asp Pro Glu
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Gly Lys Ile Leu Glu Gln Arg Ser Leu Asn Cys Ile Thr Asp Ser Asn
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Leu Asp Ile Glu Thr Asp Tyr His Arg Leu Leu Asp Glu Lys Glu Ser
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Asp Arg Lys Ile Ala Arg Arg Asp Trp Thr Thr Ile Glu Asn Ile Lys
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Glu Leu Lys Ala Gly Tyr Leu Ser Gln Val Val His Ile Val Ala Glu
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Leu Val Leu Lys Tyr Asn Ala Ile Ile Cys Leu Glu Asp Leu Asn Phe
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Gly Phe Lys Arg Gly Arg Gln Lys Val Glu Lys Gln Val Tyr Gln Lys
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Phe Glu Lys Met Leu Ile Asp Lys Leu Asn Tyr Leu Val Met Asp Lys
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Leu Gln Leu Thr Pro Asp Phe Lys Ser Phe Lys Val Leu Gly Lys Gln
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Thr Gly Ile Ile Tyr Tyr Val Pro Ala Tyr Leu Thr Ser Lys Ile Asp
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Pro Met Thr Gly Phe Ala Asn Leu Phe Tyr Val Lys Tyr Glu Asn Val
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Asp Lys Ala Lys Glu Phe Phe Ser Lys Phe Asp Ser Ile Lys Tyr Asn
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Lys Asp Gly Lys Asn Trp Asn Thr Lys Gly Tyr Phe Glu Phe Ala Phe
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Asp Tyr Lys Lys Phe Thr Asp Arg Ala Tyr Gly Arg Val Ser Glu Trp
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Thr Val Cys Thr Val Gly Glu Arg Ile Ile Lys Phe Lys Asn Lys Glu
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Lys Asn Asn Ser Tyr Asp Asp Lys Val Ile Asp Leu Thr Asn Ser Leu
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Lys Glu Leu Phe Asp Ser Tyr Lys Val Thr Tyr Glu Ser Glu Val Asp
1105 1110 1115 1120
Leu Lys Asp Ala Ile Leu Ala Ile Asp Asp Pro Ala Phe Tyr Arg Asp
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Leu Thr Arg Arg Leu Gln Gln Thr Leu Gln Met Arg Asn Ser Ser Cys
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Glu Phe Phe Cys Ser Asp Asn Asn Asp Asp Thr Thr Pro Asn Asp Ala
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Asp Ala Asn Gly Ala Phe Asn Ile Ala Arg Lys Gly Leu Trp Val Leu
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Asn Glu Ile Arg Asn Ser Glu Glu Gly Ser Lys Ile Asn Leu Ala Met
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<210> 2
<211> 3690bp
<212> DNA
<213>Butyrivibrio fibrisolvens MD2001 细菌
<400>2
tactacgaga gcctgaccaa gctgtacccc atcaagaaga ccatccgcaa cgagctggtg 60
cccatcggca agaccctgga gaacatcaag aagaacaaca tcctggaggc cgacgaggac 120
cgcaagatcg cctacatccg cgtgaaggcc atcatggacg actaccacaa gcgcctgatc 180
aacgaggccc tgagcggctt cgccctgatc gacctggaca aggccgccaa cctgtacctg 240
agccgcagca agagcgccga cgacatcgag agcttcagcc gcttccagga caagctgcgc 300
aaggccatcg ccaagcgcct gcgcgagcac gagaacttcg gcaagatcgg caacaaggac 360
atcatccccc tgctgcagaa gctgagcgag aacgaggacg actacaacgc cctggagagc 420
ttcaagaact tctacaccta cttcgagagc tacaacgacg tgcgcctgaa cctgtacagc 480
gacaaggaga agagcagcac cgtggcctac cgcctgatca acgagaacct gccccgcttc 540
ctggacaaca tccgcgccta cgacgccgtg cagaaggccg gcatcaccag cgaggagctg 600
agcagcgagg cccaggacgg cctgttcctg gtgaacacct tcaacaacgt gctgatccag 660
gacggcatca acacctacaa cgaggacatc ggcaagctga acgtggccat caacctgtac 720
aaccagaaga acgccagcgt gcagggcttc cgcaaggtgc ccaagatgaa ggtgctgtac 780
aagcagatcc tgagcgaccg cgaggagagc ttcatcgacg agttcgagag cgacaccgag 840
ctgctggaca gcctggagag ccactacgcc aacctggcca agtacttcgg cagcaacaag 900
gtgcagctgc tgttcaccgc cctgcgcgag agcaagggcg tgaacgtgta cgtgaagaac 960
gacatcgcca agaccagctt cagcaacgtg gtgttcggca gctggagccg catcgacgag 1020
ctgatcaacg gcgagtacga cgacaacaac aaccgcaaga aggacgagaa gtactacgac 1080
aagcgccaga aggagctgaa gaagaacaag agctacacca tcgagaagat catcaccctg 1140
agcaccgagg acgtggacgt gatcggcaag tacatcgaga agctggagag cgacatcgac 1200
gacatccgct tcaagggcaa gaacttctac gaggccgtgc tgtgcggcca cgaccgcagc 1260
aagaagctga gcaagaacaa gggcgccgtg gaggccatca agggctacct ggacagcgtg 1320
aaggacttcg agcgcgacct gaagctgatc aacggcagcg gccaggagct ggagaagaac 1380
ctggtggtgt acggcgagca ggaggccgtg ctgagcgagc tgagcggcat cgacagcctg 1440
tacaacatga cccgcaacta cctgaccaag aagcccttca gcaccgagaa gatcaagctg 1500
aacttcaaca agcccacctt cctggacggc tgggactacg gcaacgagga ggcctacctg 1560
ggcttcttca tgatcaagga gggcaactac ttcctggccg tgatggacgc caactggaac 1620
aaggagttcc gcaacatccc cagcgtggac aagagcgact gctacaagaa ggtgatctac 1680
aagcagatca gcagccccga gaagagcatc cagaacctga tggtgatcga cggcaagacc 1740
gtgaagaaga acggccgcaa ggagaaggag ggcatccaca gcggcgagaa cctgatcctg 1800
gaggagctga agaacaccta cctgcccaag aagatcaacg acatccgcaa gcgccgcagc 1860
tacctgaacg gcgacacctt cagcaagaag gacctgaccg agttcatcgg ctactacaag 1920
cagcgcgtga tcgagtacta caacggctac agcttctact tcaagagcga cgacgactac 1980
gccagcttca aggagttcca ggaggacgtg ggccgccagg cctaccagat cagctacgtg 2040
gacgtgcccg tgagcttcgt ggacgacctg atcaacagcg gcaagctgta cctgttccgc 2100
gtgtacaaca aggacttcag cgagtacagc aagggccgcc tgaacctgca caccctgtac 2160
ttcaagatgc tgttcgacga gcgcaacctg aagaacgtgg tgtacaagct gaacggccag 2220
gccgaggtgt tctaccgccc cagcagcatc aagaaggagg agctgatcgt gcaccgcgcc 2280
ggcgaggaga tcaagaacaa gaaccccaag cgcgccgccc agaagcccac ccgccgcctg 2340
gactacgaca tcgtgaagga ccgccgctac agccaggaca agttcatgct gcacaccagc 2400
atcatcatga acttcggcgc cgaggagaac gtgagcttca acgacatcgt gaacggcgtg 2460
ctgcgcaacg aggacaaggt gaacgtgatc ggcatcgacc gcggcgagcg caacctgctg 2520
tacgtggtgg tgatcgaccc cgagggcaag atcctggagc agcgcagcct gaactgcatc 2580
accgacagca acctggacat cgagaccgac taccaccgcc tgctggacga gaaggagagc 2640
gaccgcaaga tcgcccgccg cgactggacc accatcgaga acatcaagga gctgaaggcc 2700
ggctacctga gccaggtggt gcacatcgtg gccgagctgg tgctgaagta caacgccatc 2760
atctgcctgg aggacctgaa cttcggcttc aagcgcggcc gccagaaggt ggagaagcag 2820
gtgtaccaga agttcgagaa gatgctgatc gacaagctga actacctggt gatggacaag 2880
agccgcgagc agctgagccc cgagaagatc agcggcgccc tgaacgccct gcagctgacc 2940
cccgacttca agagcttcaa ggtgctgggc aagcagaccg gcatcatcta ctacgtgccc 3000
gcctacctga ccagcaagat cgaccccatg accggcttcg ccaacctgtt ctacgtgaag 3060
tacgagaacg tggacaaggc caaggagttc ttcagcaagt tcgacagcat caagtacaac 3120
aaggacggca agaactggaa caccaagggc tacttcgagt tcgccttcga ctacaagaag 3180
ttcaccgacc gcgcctacgg ccgcgtgagc gagtggaccg tgtgcaccgt gggcgagcgc 3240
atcatcaagt tcaagaacaa ggagaagaac aacagctacg acgacaaggt gatcgacctg 3300
accaacagcc tgaaggagct gttcgacagc tacaaggtga cctacgagag cgaggtggac 3360
ctgaaggacg ccatcctggc catcgacgac cccgccttct accgcgacct gacccgccgc 3420
ctgcagcaga ccctgcagat gcgcaacagc agctgcgacg gcagccgcga ctacatcatc 3480
agccccgtga agaacagcaa gggcgagttc ttctgcagcg acaacaacga cgacaccacc 3540
cccaacgacg ccgacgccaa cggcgccttc aacatcgccc gcaagggcct gtgggtgctg 3600
aacgagatcc gcaacagcga ggagggcagc aagatcaacc tggccatgag caacgcccag 3660
tggctggagt acgcccagga caacaccatc 3690

Claims (7)

1.一种来自于Butyrivibrio fibrisolvens MD2001细菌中的II类V型CRISPR蛋白BfCas12a,其特征在于,所述BfCas12a的氨基酸序列如SEQ ID NO.1所示。
2.根据权利要求1所述CRISPR蛋白BfCas12a,其特征在于,所述BfCas12a
识别的PAM序列为TTTV、TCTA、TTCA、TCCA、CTTA、或CCTA,所述V表示A、C、或G。
3.用于编辑权利要求1所述蛋白BfCas12a的基因,其特征在于,其核苷酸序列
如SEQ ID NO.2所示。
4.权利要求1~2任一所述BfCas12a在基因编辑中的应用。
5.根据权利要求4所述的应用,其特征在于,所述BfCas12a在原核生物基因编
辑中的应用。
6.根据权利要求4所述的应用,其特征在于,所述BfCas12a在真核生物基因编
辑中的应用。
7.根据权利要求4所述的应用,其特征在于,所述BfCas12a在体外基因编辑中
的应用。
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CN111235130A (zh) * 2019-11-15 2020-06-05 武汉大学 II类V型CRISPR蛋白CeCas12a及其在基因编辑的应用
CN111394337A (zh) * 2019-11-15 2020-07-10 武汉大学 II类V型CRISPR蛋白Lb2Cas12a及其在基因编辑的应用
CN113234701A (zh) * 2020-10-20 2021-08-10 珠海舒桐医疗科技有限公司 一种Cpf1蛋白及基因编辑系统
CN113234701B (zh) * 2020-10-20 2022-08-16 珠海舒桐医疗科技有限公司 一种Cpf1蛋白及基因编辑系统
WO2024093962A1 (zh) * 2022-11-03 2024-05-10 武汉大学 一种紧凑型编辑工具EbCas12a在基因编辑中的应用
WO2024120064A1 (zh) * 2022-12-09 2024-06-13 武汉大学 一种新型编辑工具CeCas12a-A169R-F843L在基因编辑中的应用

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