CN114149980A - 一种新型蛋白质生物素连接酶及基于其的邻近标记***PhastID - Google Patents
一种新型蛋白质生物素连接酶及基于其的邻近标记***PhastID Download PDFInfo
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- CN114149980A CN114149980A CN202111302493.0A CN202111302493A CN114149980A CN 114149980 A CN114149980 A CN 114149980A CN 202111302493 A CN202111302493 A CN 202111302493A CN 114149980 A CN114149980 A CN 114149980A
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Abstract
本发明公开了一种新型蛋白质生物素连接酶及基于其的邻近标记***PhastID。具体公开了蛋白质生物素连接酶BPL及改造后的突变蛋白质生物素连接酶BPL*及基于上述生物素连接酶BPL或BPL*的邻近蛋白标记***PhastID。所述包含蛋白质生物素连接酶BPL*的标记***,相比与传统的BioID邻近标记***,其标记强度更高,所需标记时间更短,具有较大的应用前景。
Description
技术领域
本发明涉及基因工程技术领域,具体地,涉及新型蛋白质生物素连接酶BPL及经过突变的蛋白质生物素连接酶融合蛋白BPL*及基于上述蛋白质生物素连接酶BPL或BPL*的邻近标记***PhastID。
背景技术
蛋白质生物素连接酶可以通过活化生物素(Biotin)形成生物素酰-5’-腺苷酸Biotinyl-5’-AMP,将生物素标记到其底物上。而经过人工改造,该连接酶可失去对底物的特异性标记,释放的Biotinyl-5’-AMP化学性质极不稳定,可随机与邻近的赖氨酸残基发生反应,使其共价标记生物素,该范围约为10nm以内。结合生物素与链霉亲和素之间的高亲和力和稳定性,可对蛋白进行示踪、纯化等操作。由于其标记半径约为10nm,该距离恰好是蛋白质-蛋白质相互作用(Protein-Protein Interaction,PPI)的前提,因此在蛋白质组学中具有广泛的应用前景。近年来,利用生物素连接酶进行邻近蛋白标记技术发展迅猛,这种技术首先将目的蛋白与生物素连接酶形成融合蛋白,经过一定时间的Biotin标记后,通过生物素-链霉亲和素***,纯化出目的蛋白周围被生物素连接酶标记的蛋白,再通过高通量的方法进一步鉴定出与之有相互作用的蛋白。目前,已有多种物种的生物素连接酶,经突变后发展为邻近标记技术被报道,包括BioID(BirA*,来自Escherichia coli,参考文献:Roux KJ,Kim D I,Raida M,et al.A promiscuous biotin ligase fusion protein identifiesproximal and interacting proteins in mammalian cells[J].J Cell Biol,2012,196(6):801-810.)、BioID2(BPL,来自Aquifex aeolicus,参考文献:Kim D I,Jensen S C,Noble K A,et al.An improved smaller biotin ligase for BioID proximitylabeling[J].Molecular biology of the cell,2016,27(8):1188-1196.)、RapID(BASU,来自Bacillus subtilis,参考文献:Ramanathan M,Majzoub K,Rao D S,et al.RNA–protein interaction detection in living cells[J].Nature methods,2018,15(3):207.)和TurboID(突变自BirA*,参考文献:Branon T C,Bosch J A,Sanchez AD,etal.Efficient proximity labeling in living cells and organisms with TurboID[J].Nature biotechnology,2018,36(9):880-887)。但由于这些邻近标记技术均存在一定缺陷,如:标记能力较弱,故所需时间较长,在检测瞬时或弱相互作用蛋白时能力较弱;或酶的蛋白分子量较大。因此,寻找一种新型的,在结构及功能上都更具优势的生物连接酶具有十分重要的意义。
发明内容
本发明的目的在于克服现有技术中存在的上述缺陷和不足,提供一种新型蛋白质生物素连接酶BPL。
本发明的第二个目的在于提供一种突变蛋白质生物素连接酶BPL*。
本发明的第三个目的在于提供所述蛋白质生物素连接酶BPL或突变蛋白质生物素连接酶BPL*的应用。
本发明的第四个目的在于提供一种包含上述蛋白质生物素连接酶BPL或突变蛋白质生物素连接酶BPL*的邻近标记***。
本发明的第五个目的在于提供所述邻近标记***的应用。
本发明的上述目的是通过以下技术方案给予实现的:
一种蛋白质生物素连接酶(Biotin Protein Ligase,BPL),包括来源于古细菌Pyrococcus horikoshii的BPL,称为PhBPL;来源于古细菌Pyrococcus kukulkanii的BPL,称为PkBPL;或来源于古细菌Methanocaldococcus fervens的BPL,称为MfBPL;
(a)其氨基酸序列分别依次如SEQ ID NO.1、SEQ ID NO.2、SEQ ID NO.3所述;
或
(b)与SEQ ID NO.1、SEQ ID NO.2或SEQ ID NO.3所述氨基酸序列具有70%以上同源性且具有生物素蛋白连接酶活性的蛋白。
一种突变蛋白质生物素连接酶BPL*,为蛋白质生物素连接酶BPL(PhBPL、PkBPL、MfBPL)的突变体;具体为SEQ ID NO.1所述PhBPL R48氨基酸残基的突变:R48G或R48S突变,即PhBPL(R48G)或PhBPL(R48S),称为PhBPL*;或SEQ ID NO.2所述PkBPL R48氨基酸残基的突变:R48G或R48S突变,即PkBPL(R48G)或PkBPL(R48S),称为PkBPL*;或SEQ ID NO.3所述MfBPL R40氨基酸残基的突变:R40G,即MfBPL(R40G),称为MfBPL*。
本发明将PhBPL R48氨基酸残基,PkBPL R48氨基酸残基及MfBPL R40氨基酸残基进行了突变,从而获得了较传统的BioID标记强度更高,所需标记时间更短的蛋白质生物素连接酶BPL*。
本发明还提供一种编码上述突变蛋白质生物素连接酶BPL*的核苷酸序列。
优选地,PhBPL(R48G)、PkBPL(R48G)及MfBPL(R40G)的编码核苷酸序列依次如SEQID NO.4~6所示。
一种包含所述突变蛋白质生物素连接酶BPL*编码核苷酸序列的重组表达载体。例如:pcDNA3.1(-)-BPL*、pLenti-HA-BPL*。
一种包含上述重组表达载体的宿主细胞。例如:293T细胞、HEK293T细胞、Hela细胞。
上述每一种蛋白质生物素连接酶BPL*均可单独建立一套BPL*标记***。具体地,BPL*可快速催化ATP与生物素形成Biotinyl-5’-AMP并将之释放,后者可与邻近蛋白质赖氨酸残基发生反应,并将生物素共价结合在赖氨酸残基上,从而在生物素存在的情况下,在体内或体外对邻近蛋白质进行生物素标记。
因此本发明保护上述蛋白质生物素连接酶BPL或突变蛋白质生物素连接酶BPL*在邻近蛋白标记或在制备邻近蛋白标记***中的应用。
一种包含上述蛋白质生物素连接酶BPL或突变蛋白质生物素连接酶BPL*的邻近蛋白标记***。具体为包含待研究的“诱饵蛋白”(Bait protein)、融合表达在诱饵蛋白N-端或C-端的新型蛋白质生物素连接酶BPL*。
一种邻近蛋白标记方法,先将待研究的目的蛋白与上述的突变蛋白质生物素连接酶BPL*形成融合蛋白,经生物素标记,通过生物素-链霉亲和素***,纯化出目的蛋白周围被生物素连接酶标记的蛋白,再通过高通量的方法进一步鉴定出与之有相互作用的蛋白。
具体为:
(1)通过重组或敲入等方法,在待研究的“诱饵蛋白”的N端或C端融合表达蛋白质生物素连接酶BPL*;
(2)在体外或体内,具有ATP和Biotin等底物存在的情况下,标记15min以上;
(3)将细胞或组织裂解,用偶联在固相上的(Strept-)avidin亲和纯化被Biotin标记的蛋白;
(4)利用ELISA、Western Blot、质谱等方法鉴定被标记的蛋白,以发现新的互作蛋白。
优选地,所述生物素浓度为5μM~50μM。
优选地,所述标记时间为10min~16h。
与现有技术相比,本发明具有以下有益效果:
本发明提供了一种蛋白质生物素连接酶BPL、改造后的突变蛋白质生物素连接酶BPL*及基于其的邻近标记***。所述包含蛋白质生物素连接酶BPL*的标记***,相比与传统的BioID邻近标记***,其标记强度更高,所需标记时间更短。具有较大的应用前景。
附图说明
图1为新型生物素酶标记蛋白免疫印迹(Western blot)检测结果图(左为检测结果图,右为统计图)。
图2为新型生物素酶在不同时间标记蛋白免疫印迹(Western blot)检测结果图(图A)及统计图(图B)。
图3为具有核定位信号的新型生物素酶PhBPL*与BioID2标记强度比较图(左为检测结果图,右为统计图)。
图4为新型生物素酶在不同浓度标记蛋白免疫印迹(Western blot)检测结果图。
图5为体外利用亲和链霉素检测新型生物素酶融合蛋白(TRF1)与端粒结合蛋白RAP1的相互作用图。
具体实施方式
以下结合说明书附图和具体实施例来进一步说明本发明,但实施例并不对本发明做任何形式的限定。除非特别说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。
除非特别说明,以下实施例所用试剂和材料均为市购。
实施例1蛋白质生物素连接酶BPL*(PhBPL*、PkBPL*和MfBPL*)的获得
在NCBI上获取多种物种的生物素连接酶序列,包括来源于古细菌Pyrococcushorikoshii的BPL,称为PhBPL,其氨基酸序列如SEQ ID NO.1所示;来源于古细菌Pyrococcus kukulkanii的BPL,称为PkBPL,其氨基酸序列如SEQ ID NO.2所示;和来源于古细菌Methanocaldococcus fervens的BPL,称为MfBPL,其氨基酸序列如SEQ ID NO.3所示;分析其GNGR motif(N表示碱性氨基酸),并将上述蛋白突变为GNGG形式;PhBPL R48氨基酸残基突变:R48G或R48S突变,即PhBPL(R48G)或PhBPL(R48S),称为PhBPL*;PkBPL R48氨基酸残基突变:R48G或R48S突变,即PkBPL(R48G)或PkBPL(R48S),称为PkBPL*;MfBPL R40氨基酸残基突变:R40G,即MfBPL(R40G),称为MfBPL*。
PhBPL(R48G)、PkBPL(R48G)及MfBPL(R40G)的编码核苷酸序列依次如SEQ ID NO.4~6所示。
SEQ ID NO.1:
MLGLKTSIIGRRVIYFQEITSTNEFAKTSYLEEGTVIVADKQTMGHGRLNRKWESPEGGLWLSIVLSPKVPQKDLPKIVFLGAVGVVETLKEFSIDGRIKWPNDVLVNYKKIAGVLVEGKGDKIVLGIGLNVNNKVPNGATSMKLELGSEVPLLSVFRSLITNLDRLYLNFLKNPMDILNLVRDNMILGVRVKILGDGSFEGIAEDIDDFGRLIIRLDSGEVKKVIYGDVSLRFL;
SEQ ID NO.2:
MLSLKTSIIGKKVIYYQEISSTNDVAKSLDVEEGTVIVADRQTKGRGRLNRKWISPEGGLWLSVVLKPKVAPQDIPKIVFLGAIGVVRTLEELSIPGRIKWPNDVLVNFRKISGILTEKVGEKVILGIGINVNNNTPENGIAVKNVLGKEVSLVHVFKILLENLDELYEIYLKSPGTIVELARELMILNVPVKVLGNGEVVGIAEDIDEDGRLVLRLGNGEIRKIIYGDVSLRFL;
SEQ ID NO.3:
MEIIHLSEVDSTNEYAKKLAKEGKRNFVVLADKQSTGKGRWGRVWYSDEGGLYFTIVLDSNEYDPKVINLITPISIIETLKNYTDKELGIKFPNDIMVKVNGDYKKLGGILAELINGYMIIGIGINVNNPIRKEIREIAVSLKEVVGKEIDRVEIFNDFLKRFEDYLKKLKNNEIDDYEILKNYKKYSITIGRTVKILLSNNEVITGKVYDIDFDGIVLGTEEGIEKIPTGICIHVR;
SEQ ID NO.4
atgctgggcctgaagacaagcatcatcggccggcgggtcatctacttccaggagatcaccagcaccaacgagttcgccaagaccagctacctggaggagggaaccgtgatcgtggccgataagcagaccatgggccacggaggcctgaacagaaagtgggagtccccagaaggaggcctgtggctgtctatcgtgctcagccctaaagtgccccagaaggacctgcctaagatcgtgttcctgggagcagtgggcgtggtggaaaccctgaaggagttcagcatcgacggcagaatcaagtggcccaacgacgtgctcgtgaactacaagaagatcgccggcgtgctggtcgagggcaaaggcgacaagatcgtgctgggcatcggcctgaacgtgaacaacaaggtgcccaacggcgccacaagcatgaaactggagctgggatcagaagtgcctctgctgagcgtgttcaggagcctgatcaccaacctggaccggctgtacctgaacttcctgaagaaccccatggacatcctgaacctcgtgcgggacaacatgatcctgggcgtgagagtgaagatcctgggcgacggcagcttcgagggcatcgccgaggatatcgacgacttcgggcggctgatcatcaggctggacagcggcgaggtcaagaaggtcatctacggcgacgtgtccctgagattcctgtag;
SEQ ID NO.5:
atgctgagcctgaagaccagcatcatcggcaagaaggtcatctactaccaggagatcagcagcaccaacgacgtggctaagagcctggacgtggaggaaggaaccgtgatcgtggccgataggcagaccaagggaaggggaggcctgaatcgcaagtggatcagcccagaaggaggactctggctgtcagtggtgctcaagcctaaagtggcccctcaggacatccccaagatcgtgtttctgggcgccatcggcgtcgtgagaacactggaggagctgagcatccccggcagaatcaagtggcccaacgacgtgctcgtgaacttccggaagatcagcggcatcctgaccgagaaggtcggcgagaaggtcatcctgggcatcggcatcaacgtgaacaacaacacccccgagaacggcattgccgtgaagaacgtgctgggcaaggaagtgtctctggtgcacgtgttcaagatcctgctggagaacctggacgagctgtacgagatctacctgaagagccccggcaccatcgtggaactggccagggagctgatgatcctgaacgtgcccgtgaaggtgctgggaaacggagaggtcgtgggaatcgccgaggatatcgacgaggacggcagactggtgctgagactgggaaacggcgagatccggaagatcatctacggcgacgtgtccctgagattcctgtag;
SEQ ID NO.6:
atggagatcatccacctgagcgaagtggacagcaccaacgagtacgccaagaagctggccaaggagggcaagcggaacttcgtggtgctggccgacaagcagagcacaggaaaaggcggctggggcagagtgtggtatagcgacgagggaggcctgtacttcaccatcgtgctggacagcaacgagtacgaccccaaggtcatcaacctgatcacccccatcagcatcatcgagaccctgaagaactacaccgacaaggagctgggcatcaagttccccaacgacatcatggtgaaggtcaacggcgactacaagaagctgggcggaatcctggccgaactgatcaacggctacatgatcatcggcatcggcatcaacgtgaacaaccccatccggaaggagatccgggagatcgcagtgtccctgaaggaggtcgtgggaaaggagatcgaccgggtggagatcttcaacgacttcctgaagcgcttcgaggactacctgaagaagctgaagaacaacgagatcgacgactacgagatcctgaagaactacaagaagtacagcatcaccatcggccggaccgtgaagatcctgctgagcaacaacgaggtcatcaccggcaaggtgtacgacatcgacttcgacggcatcgtgctgggaacagaggagggcatcgagaagatccccaccggcatttgcatccacgtccgatag。
实施例2蛋白质生物素连接酶BPL*重组质粒构建及表达
(1)重组质粒的构建
将真核表达载体pcDNA3.1(-)用BamHI和HindIII双酶切后回收,然后与经BamHI和HindIII双酶切后回收的新型生物素连接酶BPL*(PhBPL*、PkBPL*和MfBPL*)PCR片段(SEQID NO.4~6)在T4连接酶作用下连接,转化DH5α感受态细胞后涂布在含氨苄的LB平板,过夜培养后挑取单菌落扩增培养并提取质粒,进行测序鉴定,鉴定的阳性质粒即为所需重组质粒。
(2)哺乳动物细胞瞬时表达新型生物素连接酶
为构建表达新型生物素连接酶的哺乳细胞系,利用Lipofectamine 2000转染法将步骤(1)的pcDNA3.1重组质转染入293T细胞,具体步骤如下:
转染前一天,在六孔板中接种293T细胞,于37℃、5%CO2、含有10%胎牛血清的DMEM完全培养基中培养,至转染时细胞密度为40%~60%。在250μL Opti-MEM减血清培养基中稀释2μg重组质粒,并轻轻混匀。另取10μL Lipofectamine 2000,稀释于250μL Opti-MEM减血清培养基中。室温下静置5分钟。混合Lipofectamine 2000和线性化质粒的稀释液。轻轻混匀并在室温下静置20分钟。向细胞板上接种293T细胞的孔中加混合液500μL,并前后轻轻摇动细胞板使混合液与孔中的培养液混匀,转入CO2培养箱中培养。次日更换新鲜的含有10%胎牛血清的DMEM完全培养基中继续培养。
(3)Western blotting检测生物素标记
转染24h后收取细胞,Western blot检测标记效果,如图1(左为检测结果图,右为统计图)所示,PhBPL*、PkBPL*和MfBPL*同已被发表的AaBPL*(BioID2)类似,均展现出标记活性。
Western blotting具体实施方法如下:
(a)SDS—PAGE胶的配制
首先选取合适厚度的长玻璃板(1mm或0.75mm),与短玻璃板对齐夹在制胶夹上,用洗瓶向两板间空隙加满ddH2O进行验漏,如一至两分钟水平面没有下降说明两胶板配合严密,此时将水倒出并用吸水纸吸干。取干净烧杯按下表1配制分离胶(以一块10%的分离胶为例):
表1分离胶配制成分
将分离胶溶液倒入两板间空隙,用洗瓶沿着玻璃板壁在胶上层加入ddH2O,约20min后可看到胶与水明显分层,说明胶已凝固;
将上层水倒出并用吸水纸吸干,准备与胶板厚度对应的梳子(10孔or 15孔),按下表2配制浓缩胶:
表2浓缩胶配制成分
将浓缩胶溶液小心加入分离胶上层,尽量避免气泡产生。胶板加满后,小心插上梳子,约10min后可见梳齿边缘明显轮廓,说明胶已凝固。将胶板从制胶夹中拿出,用水冲洗后待用。
(b)SDS-PAGE凝胶电泳
将胶连同胶板安装在电泳槽上,内槽加满电泳缓冲液,外槽加至指示刻度。将准备好的蛋白样品点入胶孔后盖好盖子连接电源,设置两步电泳程序:80V15min,150V 45min,待溴酚蓝指示带跑至胶的下边缘是停止。在流水下撬开两玻璃板,将胶取出,根据需要泡入不同溶液中,如考马斯亮蓝染液,硝酸银染色固定液或转膜缓冲液。
(c)膜转印
准备与胶差不多大小的NC膜,并准备滤纸,同样泡入预冷的转膜缓冲液中。依照海绵、滤纸、NC膜、胶、滤纸、海绵的顺序将其叠放好(注意胶与膜间不应有气泡),用转膜夹夹紧后安装在转膜槽,加满转膜液。转膜槽置于冰浴中或者放入4度冰箱,200-250mA转膜1小时。
(d)蛋白信号检测
将转膜完毕的NC膜置于封闭液中摇动1h,转移至稀释的Streptavidin-HRP中孵育1h或者4度过夜,孵育后将膜在TBST溶液中漂洗3次,采用LuminataTM Forte作为底物显色,在BioRad ChemiDoc XRS+凝胶成像***中拍照。
或者,封闭后的NC膜用稀释的Streptavidin-Alexa Fluor 680孵育1h,孵育后将膜在TBST溶液中漂洗3次。蛋白条带信号用Odyssey双色红外激发光成像***检测并记录。
实施例3采用蛋白质生物素连接酶BPL*标记邻近蛋白的条件探索
分别将新型生物素连接酶BPL*(PhBPL*、PkBPL*和MfBPL*)(SEQ ID NO.4~6)与端粒结合蛋白TRF1一起重组克隆到慢病毒载体上,在其N端加入HA抗原,形成pLenti-HA-BPL*-TRF1载体,同时构建pLenti-HA-BPL*-NLS载体。
将HEK293T细胞传至6cm2培养皿,代其密度达到70%-80%进行转染。转染前,根据需要选择配制表3所示下列转染体系:
表3转染体系
体系配好后用移液枪吹打混匀,室温静置15min。加至培养的细胞培养基中,前后摇动混匀;6小时后换新鲜培养基,继续培养至48小时;收集病毒液上清。
病毒收集后,进行病毒感染目的细胞。首先要将HeLa细胞进行铺板,保证细胞的浓度低于60%,在病毒液中加入浓度为10mg/ml的polybrene,使得终浓度为8μg/ml,均匀混合好。吸取目的细胞中的培养基,加入病毒混合液,并加入新鲜培养基补充至5ml,将细胞静置于37度培养箱中。感染结束后,收取样品进行Western blot检测融合蛋白的表达。
确认细胞过表达生物素连接酶-端粒结合蛋白TRF1融合蛋白后,采用去除内源性Biotin的培养基培养细胞,进行以下条件的摸索:
(1)标记时间:0min,1min,10min,30min,1h,2h,4h,8h和16h;
结果如图2~3所示,图2为新型生物素酶BPL*在不同时间标记蛋白免疫印迹(Western blot)检测结果图(图2A)及统计图(图2B),结果表明,标记强度随标记时间加长而更强,PhBPL*-TRF1在2h就趋近标记饱和,PkBPL*、MfBPL*和AaBPL*(BioID2)则不存在饱和现象。图3为具有核定位信号的新型生物素酶PhBPL*与BioID2标记强度比较图(左为检测结果图,右为统计图),结果表明,PhBPL*-NLS标记活性远远强于AaBPL*(BioID2),PhBPL*标记10分钟即可具有一定效果,4h可以达到AaBPL*标记16h效果。
(2)生物素浓度:0μM,0.5μM,5μM和50μM
图4为新型生物素酶BPL*在不同生物素浓度下,对蛋白质进行标记的效果。结果表明,新型生物素酶BPL*在0.5μM,5μM和50μM均显示出标记活性,其中,优选的生物素浓度为5μM-50μM。
(3)链霉亲和素纯化实验
裂解过表达生物素连接酶-TRF1的Hela细胞,利用链霉亲和素纯化被标记上Biotin的蛋白,检测基于新型生物素连接酶的标记***,是否可以标记到TRF1的邻近(而非直接互作)蛋白RAP1。
具体实施流程如下:
收集细胞样品(6cm培养皿),使用480μL RIPA裂解细胞15min,于4℃15,000g离心15min。取400μL上清与偶联链霉亲和素的磁珠于4℃三维旋转孵育2h。取40μL作为Input样品。完成下拉的磁珠样品用1mL 2%SDS、500μL TBST和500μL TBS分别洗涤两次。将洗涤过的磁珠样品加入含SDS的洗脱液在沸水中煮10分钟后进行Western blot检测。
结果如图5所示,表明基于PhBPL*、PkBPL*和MfBPL*的标记***,同BioID2类似,均展现出对RAP1的标记能力,其中PhBPL*标记能力最强,PkBPL*的标记特异能力较高。
序列表
<110> 中山大学
<120> 一种新型蛋白质生物素连接酶及基于其的邻近标记***PhastID
<141> 2021-11-04
<160> 6
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Claims (10)
1.一种蛋白质生物素连接酶BPL,其特征在于,
(a)其氨基酸序列如SEQ ID NO.1、SEQ ID NO.2或SEQ ID NO.3所述;
或
(b)与SEQ ID NO.1、SEQ ID NO.2或SEQ ID NO.3所述氨基酸序列具有70%以上同源性且具有生物素蛋白连接酶活性的蛋白。
2.一种突变蛋白质生物素连接酶BPL*,其特征在于,为SEQ ID NO.1所述氨基酸序列R48G或R48S突变;或SEQ ID NO.2所述氨基酸序列R48G或R48S突变;或SEQ ID NO.3所述氨基酸序列R40G突变。
3.一种编码权利要求2所述突变蛋白质生物素连接酶BPL*的核苷酸序列。
4.一种包含权利要求3所述突变蛋白质生物素连接酶BPL*编码核苷酸序列的重组表达载体。
5.一种包含权利要求4所述重组表达载体的宿主细胞。
6.权利要求1所述的蛋白质生物素连接酶BPL或权利要求2所述突变蛋白质生物素连接酶BPL*在邻近蛋白标记或在制备邻近蛋白标记***中的应用。
7.一种包含权利要求1所述蛋白质生物素连接酶BPL或权利要求2所述突变蛋白质生物素连接酶BPL*的邻近蛋白标记***。
8.一种邻近蛋白标记方法,其特征在于,先将待研究的目的蛋白与权利要求2的突变蛋白质生物素连接酶BPL*形成融合蛋白,经生物素标记,通过生物素-亲和素***,纯化出目的蛋白周围被生物素连接酶标记的蛋白,再通过高通量的方法进一步鉴定出与之有相互作用的蛋白。
9.根据权利要求8所述的方法,其特征在于,所述生物素浓度为0.5μM~50μM。
10.根据权利要求8所述的方法,其特征在于,所述标记时间为10min~16h。
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