CN116064599A - 一种在大肠杆菌中表达生产Terrequinone A的基因组合及其应用 - Google Patents
一种在大肠杆菌中表达生产Terrequinone A的基因组合及其应用 Download PDFInfo
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Abstract
本发明提供一种在大肠杆菌中表达生产Terrequinone A的基因组合及其应用,所述基因组合包括核苷酸序列如SEQ ID NO.1~8所示的tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因,本发明通过将所述八个基因分别构建重组质粒pC02以及pU03,并将重组质粒pC02和pU03同时转化到大肠杆菌中,获得一种可生产具有抗癌细胞生物活性的Terrequinone A的重组工程菌,其发酵液中Terrequinone A的含量约为106.3mg/L,在生物制药领域具有潜在的应用价值。
Description
技术领域
本发明属于基因工程领域,具体涉及一种在大肠杆菌中表达生产Terrequinone A的基因组合及其应用。
背景技术
双吲哚醌类化合物是一类具有抗逆转录病毒、抗糖尿病或细胞毒性生物活性的真菌天然产物。双吲哚醌自可皆霉素(Cochliodinol)被发现以来,其家族成员不断壮大,而在这其中,从沙漠植物根际真菌土曲霉(Aspergillus terreus)中首次分离出来的Terrequinone A,对四种人类癌细胞(NCIH460、MCF-7、SF-268和MIA Pa Ca-2)具有中等细胞毒性,是一种潜在的抗癌药物(He et al.,Journal of Natural Products,2004,67(12):1985-1991),也是唯一一种有生物合成信息的双吲哚醌类化合物。2004年,Bok等人利用转录调控因子LaeA对构巢曲霉(Aspergillus nidulans)的次生代谢组进行了挖掘,识别了Terrequinone A的合成基因簇tdiABCDE(Bok et al.,Eukaryotic Cell,2004,3(2):527-535)。
Terrequinone A作为一种天然产物,其结构复杂、官能团较多,采用化学合成法所需步骤多、产率低以及环境不友好,随着Terrequinone A在生物体内进行合成和修饰的特殊途径被阐明,利用生物催化法合成Terrequinone A成为一种有效的尝试,Balibar等人分别过表达和研究了tdiABCDE基因簇中的5个基因,通过酶的体外分步反应成功合成了Terrequinone A(Carl J Balibar等人,Terrequinone A biosynthesis through L-tryptophan oxidation,dimerization and bisprenylation,Nature Chemical Biology,2007,3(9):584-592)。然而,体外合成需要外源性地添加昂贵的辅因子和辅因子再生酶系;另外,游离酶催化体系中一种酶催化的产物往往是下一个酶的底物,其底物产物的传递通常受到空间的限制,降低了产物的合成效率。因此,需要寻求更加高效的方法来生产Terrequinone A。大肠杆菌作为一种优良的生物反应器,通过对其进行合成途径的改造或引入新的代谢途径,可用于生物合成高价值天然产物,它能完美地规避上述两个问题。
发明内容
本发明的目的在于提供一种在大肠杆菌中表达生产Terrequinone A的基因组合及其应用,从而解决现有技术中体外合成Terrequinone A存在的生产成本较高、合成效率较低的问题。
为了解决上述问题,本发明提供如下技术方案:
根据本发明的第一方面,提供一种在大肠杆菌中表达生产Terrequinone A的基因组合,所述基因组合包括tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因,其中,所述tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因的核苷酸序列如SEQ ID NO.1~8所示。
根据本发明的第二方面,提供一种用于生产Terrequinone A的重组质粒pC02,所述重组质粒pC02由基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES、T7sfpS按顺序串联并连接到大肠杆菌表达载体上构建而成,其中,所述基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES、T7 sfpS由核苷酸序列如SEQ ID NO.1~6所示的tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因分别与T7启动子和终止子连接而成。
优选地,所述大肠杆菌表达载体为pCAMBIA1301。
根据本发明的第三方面,提供一种用于生产Terrequinone A合成所需原料二甲基烯丙基焦磷酸DMAPP的重组质粒pU03,所述重组质粒pU03由基因表达盒T7 ScCKS和T7AtIPKS按顺序串联并连接到大肠杆菌表达载体上构建而成,其中,所述基因表达盒T7ScCKS和T7 AtIPKS由核苷酸序列如SEQ ID NO.7~8所示的ScCKS基因和AtIPKS基因分别与T7启动子和终止子连接而成。
优选地,所述大肠杆菌表达载体为pUC19。
根据本发明的第四方面,提供一种可生产Terrequinone A的重组大肠杆菌的制备方法,包括以下步骤:S1:对tdiA基因、tdiB基因、tdiC基因、tdiD基因、tidE基因、sfp基因、ScCK基因和AtIPK基因按大肠杆菌表达模式优化,分别获得tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因,所述tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因的核苷酸序列如SEQ ID NO.1~8所示,将八个基因分别与T7启动子和终止子连接,构建基因表达盒T7tdiAS、T7 tdiBS、T7tdiCS、T7 tdiDS、T7 tidES、T7 sfpS、T7 ScCKS和T7 AtIPKS;S2:将步骤S1获得的六个基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES和T7 sfpS连接入大肠杆菌表达载体,获得含tdiAS、tdiBS、tdiCS、tdiDS、tidES和sfpS的六个基因表达盒的重组质粒pC02;S3:将步骤S1获得的两个基因表达盒T7 ScCKS和T7 AtIPKS连接入大肠杆菌表达载体,获得含ScCKS和AtIPKS的两个基因表达盒的重组质粒pU03;S4:将步骤S2获得的重组质粒pC02和步骤S3获得的重组质粒pU03同时转化到大肠杆菌中,获得可生产Terrequinone A的重组大肠杆菌。
步骤S2中,将六个基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7tdiDS、T7 tidES和T7 sfpS按顺序串联,并在T7 tdiAS的5’-端连接EcoRⅠ内切酶位点,在T7 sfpS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7tdiAS-T7 tdiBS-T7 tdiCS-T7 tdiDS-T7 tidES-T7sfpS-HindⅢ。
步骤S3中,将两个基因表达盒T7 ScCKS和T7 AtIPKS按顺序串联,并在T7 ScCKS的5’-端连接EcoRⅠ内切酶位点,在T7 AtIPKS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7ScCKS-T7 AtIPKS-HindⅢ。
根据本发明的第五方面,提供一种根据上述方法获得的可生产Terrequinone A的重组大肠杆菌。
根据本发明的第六方面,提供一种利用重组大肠杆菌生产Terrequinone A的方法,将所述重组大肠杆菌接种于含100μg/ml氨苄霉素和50μg/ml卡那霉素的M9液体培养基中,37℃培养至菌液OD600达到0.6时,加入0.2%阿拉伯糖,继续在25℃培养14~18h,向发酵液中添加底物L-色氨酸和异戊烯醇,然后在30℃培养22~26h,即可生产Terrequinone A;其中,每升所述M9液体培养基包括:15g甘油,6g Na2HPO4,3g KH2PO4,1g NH4Cl,0.5g NaCl,0.12g MgSO4,0.011g CaCl2,2.9mg ZnSO4·7H2O,0.2mL 1%(w/v)维生素B1,5g水解酪蛋白。
根据本发明的一个优选方案,将重组大肠杆菌BL-3接种于含100μg/ml氨苄霉素和50μg/ml卡那霉素的优化后的M9液体培养基(15g甘油(glycerol),6g Na2HPO4,3g KH2PO4,1g NH4Cl,0.5g NaCl,0.12g MgSO4,0.011g CaCl2,2.9mg ZnSO4·7H2O,0.2mL 1%(w/v)维生素B1(vitamin B1)以及5g水解酪蛋白(acid-hydrolyzed casein)每升)中,37℃培养至菌液OD600达到0.6时,加入0.2%阿拉伯糖,继续在25℃培养16h,向发酵液中添加底物L-色氨酸和异戊烯醇,然后在30℃培养24h,即可生产Terrequinone A。
优选地,向发酵液中添加底物L-色氨酸的浓度为0.75g/L,异戊烯醇的浓度为0.95g/L。
本发明中,根据大肠杆菌的密码子偏好性对tdiA基因、tdiB基因、tdiC基因、tdiD基因、tidE基因、sfp基因、ScCK基因和AtIPK基因作为整体进行优化,优化原则包括:(一)按照大肠杆菌密码子偏爱性优化基因,优化基因密码子,提高基因翻译效率;(二)消除茎环结构、转录终止信号、同一基因或相邻基因200bp以内的逆向重复序列,并使基因内部的GC/AT均衡,提高RNA的稳定性;(三)使基因编码蛋白符合N端原则,以提高翻译蛋白的稳定性;(四)优化mRNA二级结构自由能,以提高基因表达效率;(五)在满足上述四个原则的基础上,选择消除四个基因内部的EcoRI和HindIII内切酶识别位点,便于构建重组质粒;优化后获得tdiAS、tdiBS、tdiCS、tdiDS、tidES、sfpS、ScCKS和AtIPKS基因。
本发明通过化学方法合成了编码非核糖体肽合成酶的tdiAS基因、编码甲代丙烯基-L-色氨酸合成酶的tdiBS基因、编码氧化还原酶的tdiCS基因、编码氨基转移酶的tdiDS基因、编码伴侣蛋白的tidES基因、编码磷酸泛酰巯基乙胺基转移酶的sfpS基因、编码胆碱激酶的ScCKS基因和编码异戊烯基磷酸激酶的AtIPKS基因,首次将该八段基因分别与大肠杆菌T7启动子和终止子连接,构建成相应的基因表达盒。将六个基因表达盒T7 tdiAS、T7tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES和T7 sfpS连接入大肠杆菌表达载体,获得重组质粒pC02;将两个基因表达盒T7 ScCKS和T7 AtIPKS连接入大肠杆菌表达载体,获得重组质粒pU03;将pC02和pU03同时转化到大肠杆菌中,获得的重组工程菌可用于生产具有抗癌细胞生物活性的Terrequinone A,在添加0.75g/L的L-色氨酸和0.95g/L的异戊烯醇的情况下,其发酵液中Terrequinone A的含量可达到106.3mg/L。
与现有技术相比,本发明具有如下有益效果:
本发明利用合成生物学技术,对tdiA基因、tdiB基因、tdiC基因、tdiD基因、tidE基因、sfp基因、ScCK基因和AtIPK基因按大肠杆菌表达模式优化,优化后分别与大肠杆菌T7启动子和终止子连接,构建基因表达盒,再与大肠杆菌表达载体连接获得多基因大肠杆菌转化载体,构建基因工程菌,编码非核糖体肽合成酶的tdiAS基因、编码甲代丙烯基-L-色氨酸合成酶的tdiBS基因、编码氧化还原酶的tdiCS基因、编码氨基转移酶的tdiDS基因、编码伴侣蛋白的tidES基因、编码磷酸泛酰巯基乙胺基转移酶的sfpS基因、编码胆碱激酶的ScCKS基因和编码异戊烯基磷酸激酶的AtIPKS基因均能活性表达,以L-色氨酸和异戊烯醇为底物,可生产具有抗癌细胞生物活性的Terrequinone A,在生物制药领域具有潜在的应用价值。
在构巢曲霉(Aspergillus nidulans)的Terrequinone A合成途径中,每一分子terrequione A的合成需要消耗2分子的DMAPP,大肠杆菌中原有的MEP途径所产生的DMAPP无法满足Terrequione A合成的需求,本发明在大肠杆菌中同时转入了多基因转化载体pU03,获得的重组菌以异戊烯醇为底物,可为Terrequinone A合成提供充足的DMAPP。
He等人对土曲霉(Aspergillus terreus)经过28天的培养后,从5.4L的发酵液中分离得到6.0mg Terrequinone A粉末(He et al.,Journal of Natural Products,2004,67(12):1985-1991)。与天然菌株Aspergillus terreus相比,本发明的重组大肠杆菌在经过48h的培养后,发酵液中Terrequinone A的含量可达到106.3mg/L,在转化速率和产物浓度上均有显著提高。
附图说明
图1为本发明实施例3中重组质粒pC02和pU03的结构示意图;
图2为本发明实施例3中大肠杆菌BL-3转入的Terrequinone A合成途径;
图3为本发明实施例4中大肠杆菌BL-3外源基因的PCR检测结果,其中,M为Marker;
图4为本发明实施例5中Terrequinone A的质谱测定鉴定图(正离子m/z=491.2);
图5为本发明实施例5中菌培养液经氯仿萃取后的HPLC图谱;
图6为本发明实施例6中添加不同浓度底物后Terrequinone A的含量。
具体实施方式
下面结合说明书附图和具体实施例对本发明作进一步说明。
实施例中所使用的试验方法如无特殊说明,均为常规分子生物学方法;所使用的材料、试剂等,如无特殊说明,为可从商业途径得到的试剂和材料。
实施例1八段基因的优化
基于tdiA(Genbank:EF550581.1)、tdiB(Genbank:EF550582.1)、tdiC(Genbank:EF550583.1)、tdiD(Genbank:EF550584.1)、tidE基因(Genbank:EF550585.1)、sfp基因(GenBank:X65610.1,Bacillus subtilis)、ScCK基因(GenBank:AAA34499.1,Saccharomyces cerevisiae)和AtIPK基因(GenBank:AY150412.1,Arabidopsis thaliana)的编码序列,按照以下原则对上述八个基因作为整体进行优化:
(一)按照大肠杆菌密码子偏爱性优化基因,优化基因密码子,提高基因翻译效率;(二)消除茎环结构、转录终止信号、同一基因或相邻基因200bp以内的逆向重复序列,并使基因内部的GC/AT均衡,提高RNA的稳定性;(三)使基因编码蛋白符合N端原则,以提高翻译蛋白的稳定性;(四)优化mRNA二级结构自由能,以提高基因表达效率;(五)在满足上述四个原则的基础上,选择消除八个基因内部的EcoRI和HindIII内切酶识别位点,便于构建重组质粒。
优化后,获得tdiAS、tdiBS、tdiCS、tdiDS、tidES、sfpS、ScCKS和AtIPKS基因,所述tdiAS基因的核苷酸序列如SEQ ID NO.1所示;所述tdiBS基因的核苷酸序列如SEQ ID NO.2所示;所述tdiCS基因的核苷酸序列如SEQ ID NO.3所示;所述tidDS基因的核苷酸序列如SEQ ID NO.4所示;所述tdiES基因的核苷酸序列如SEQ ID NO.5所示;所述sfpS基因的核苷酸序列如SEQ ID NO.6所示;所述ScCKS基因的核苷酸序列如SEQ ID NO.7所示;所述AtIPKS基因的核苷酸序列如SEQ ID NO.8所示。
实施例2基因表达盒的构建
在每个优化的基因序列前端连接大肠杆菌T7启动子序列,在每个优化的基因序列末端连接大肠杆菌T7终止子序列,构建基因表达盒T7tdiAS、T7 tdiBS、T7 tdiCS、T7tdiDS、T7 tidES、T7 sfpS、T7 ScCKS和T7 AtIPKS,由南京金斯瑞公司化学合成。
T7启动子序列(SEQ ID NO.9)为:
5’-TAATACGACTCACTATAGG-3’;
T7终止子序列(SEQ ID NO.10)为:5’-TAGCATAACCCCTTGGGGCCTCTAAACGGGTCTTGAGGGGTTTTT TG-3’。
实施例3构建重组质粒并转化
利用“聚丙烯酰胺凝胶电泳(PAGE)介导的重叠延伸PCR”技术(彭日荷等人,Adirect and efficient PAGE-mediated overlap extension PCR method for genemultiple-site mutagenesis,Appl Microbiol Biotechnol.2006,73(1):234-40),将构建的六个基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES和T7 sfpS按顺序串联,并在T7 tdiAS的5’-端连接EcoRⅠ内切酶位点,在T7 sfpS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7 tdiAS-T7 tdiBS-T7 tdiCS-T7 tdiDS-T7 tidES-T7 sfpS-HindⅢ。将两个基因表达盒T7 ScCKS和T7 AtIPKS按顺序串联,并在T7 ScCKS的5’-端连接EcoRⅠ内切酶位点,在T7 AtIPKS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7 ScCKS-T7 AtIPKS-HindⅢ。
为获得EcoRⅠ-T7 tdiAS-T7 tdiBS-T7 tdiCS-T7 tdiDS-T7 tidES-T7sfpS-HindⅢ,设计的引物序列(SEQ ID NO.11~SEQ ID NO.22)如下:
T7 tdiAS:
P1:5’-GAATCCTAATACGACTCACTATAGGATGGCACCATCTAAG-3’;
P2:5’-GTATTCAGTAGCCATCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 tdiBS:
P3:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGATGGCTACTGAATAC-3’;
P4:5’-AAGAGCTGCGTGCATCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 tdiCS:
P5:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGATGCACGCAGCTCTT-3’;
P6:5’-ACCAATAGAACCCATCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 tdiDS:
P7:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGATGGGTTCTATTGGT-3’;
P8:5’-ATGGTCTGTTAACCATCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 tdiES:
P9:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGATGGTTAACAGACCAT-3’;
P10:5’-ACCGTAGATTTTCATCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 spfS:
P11:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGATGAAAATCTACGGT-3’;
P12:5’-AAGCTTCAAAAAACCCCTCAAGACCCGTTTAGAGG-3’。
第一步PCR:分别以T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7tidES和T7 sfpS基因片段为模板,添加对应的引物进行PCR扩增。PCR扩增程序:94℃30s,68℃60s,共10个循环;
将第一步PCR获得的6个基因片段进行凝胶电泳,胶回收;
第二步PCR:以胶回收获得的6个基因片段的混合物作为模板,以P1和P12为引物进行PCR扩增。PCR扩增程序:94℃预变性1min;94℃30s,58℃30s,72℃30s,共25个循环;最后72℃再延伸10min。为获得EcoRⅠ-T7 tdiAS-T7 tdiBS-T7 tdiCS-T7 tdiDS-T7 tidES-T7sfpS-HindⅢ,设计的引物序列(SEQ ID NO.23~SEQ ID NO.26)如下:
T7 ScCKS:
P13:5’-GAATCCTAATACGACTCACTATAGGATGGTTCAAGAGT-3’;
P14:5’-CTTCTCCAGCTCGTTCCCTATAGTGAGTCGTATTACAAAAAACCCCTC-3’;
T7 AtIPKS:
P15:5’-TTGAGGGGTTTTTTGTAATACGACTCACTATAGGGAACGAGCTGGAGAAG-3’;
P16:5’-AAGCTTCAAAAAACCCCTCAAGACCCGTTTAGAGG-3’。
第一步PCR:分别以T7 ScCKS和T7 AtIPKS基因片段为模板,添加对应的引物进行PCR扩增。PCR扩增程序:94℃30s,68℃60s,共10个循环;
将第一步PCR获得的2个基因片段进行凝胶电泳,胶回收;
第二步PCR:以胶回收获得的2个基因片段的混合物作为模板,以P13和P16为引物进行PCR扩增。PCR扩增程序:94℃预变性1min;94℃30s,58℃30s,72℃30s,共25个循环;最后72℃再延伸10min。将上述串联的六个基因片段EcoRⅠ-T7 tdiAS-T7 tdiBS-T7 tdiCS-T7tdiDS-T7tidES-T7 sfpS-HindⅢ用EcoRⅠ和HindⅢ双酶切并连接到经同样酶切的载体pCAMBIA1301上,获得含有六个基因的重组质粒pC02;将两个基因片段EcoRⅠ-T7 ScCKS-T7AtIPKS-HindⅢ用EcoRⅠ和HindⅢ双酶切并连接到经同样酶切的载体pUC19上,获得含有两个基因的重组质粒pU03(如图1所示)。
采用热激法同时将pC02和pU03转入大肠杆菌BL21-AI中,涂布在含100μg/ml氨苄霉素和50μg/ml卡那霉素抗性的固体LB平板上,37℃过夜培养后挑取阳性克隆,即重组大肠杆菌BL-3,其转入的Terrequinone A合成途径如图2所示。
实施例4重组大肠杆菌的鉴定
通过PCR鉴定外源基因在大肠杆菌中的成功转入,挑取单菌落接种于50ml含100μg/ml氨苄霉素和50μg/ml卡那霉素的LB液体培养基中,37℃培养至菌液OD600达到0.6时,4℃10000rpm离心1min收集菌体,将菌体用Trizol方法抽提质粒DNA,以抽提的质粒为PCR模板,用如下引物和扩增条件进行外源tdiAS、tdiBS、tdiCS、tdiDS、tidES、sfpS、ScCKS和AtIPKS基因的PCR检测。
根据各基因的特异性片段设计的PCR检测所用引物序列(SEQ ID NO.27~SEQ IDNO.42)如下:
tdiA-F:5’-TCCGTCAAGTGCATGGATGTC-3’;
tdiA-R:5’-CAGACCACGCTCACGCAGGAC-3’;
tdiB-F:5’-GCACTGAAGAAGCTGGGTAAC-3’;
tdiB-R:5’-ACGGAAACCGAAGTCACCAGC-3’;
tdiC-F:5’-ATCTCTCGTAAGCCAATCTGC-3’;
tdiC-R:5’-GACGATGACGACACGGGAACC-3’;
tdiD-F:5’-ATGTTCGTCTGGCTGGAACTC-3’;
tdiD-R:5’-GCAACGATCGACCAGACCAGC-3’;
tdiE-F:5’-AAGACCTTGGGTTTGTGGAAC-3’;
tdiE-R:5’-GACGTCGGAACCAGGTGCAGC-3’;
sfp-F:5’-TCTCACTCTGGACGTTGGGTG-3’;
sfp-R:5’-TGCAGATGCGATGAGACGTTG-3’;
ScCK-F:5’-GGTCCTAACGGCAAGAAGTAC-3’;
ScCK-R:5’-GGAGGAGAAGTTCTTGCACTC-3’;
AtIPK-F:5’-CCACTGTTGGAGCACACTGAC-3’;
AtIPK-R:5’-GGAGAAACGGATGATAGTACC-3’。
所用扩增程序:94℃预变性3min;94℃30s,54℃30s,72℃30s,共30个循环;最后72℃再延伸10min。结果参见图2。
图3结果显示,本发明的重组大肠杆菌BL-3扩增出上述八个基因tdiAS、tdiBS、tdiCS、tdiDS、tidES、sfpS、ScCKS和AtIPKS,表明两个重组质粒pC02和pU03都转入了大肠杆菌中,所获得的重组大肠杆菌BL-3中包含该八个外源基因。
实施例5重组大肠杆菌BL-3生产Terrequinone A
挑取实施例3中转化了本发明多基因的重组质粒pC02和pU03的单菌落,接种于50ml含100μg/ml氨苄霉素和50μg/ml卡那霉素的优化后的M9液体培养基(15g甘油(glycerol),6g Na2HPO4,3g KH2PO4,1g NH4Cl,0.5g NaCl,0.12g MgSO4,0.011g CaCl2,2.9mg ZnSO4·7H2O,0.2mL 1%(w/v)维生素B1(vitamin B1)以及5g水解酪蛋白(acid-hydrolyzed casein)每升)中,37℃培养至菌液OD600达到0.6时,加入终浓度为0.2%的L-阿拉伯糖,继续在25℃培养16h,向发酵液中添加0.5g/L的L-色氨酸和等物质的量的异戊烯醇,然后在30℃培养24h,即可。
取200μl发酵液,加入两倍体积甲醇,用超声波破碎细胞(功率为400W,超声4s,间歇8s,重复99轮),4℃10000rpm离心1min,取上清,用等体积氯仿萃取,减压蒸馏后用甲醇重溶,用于Terrequinone A检测。
通过LC-MS检测,将样品质谱图(如图4所示)与文献报道的Terrequinone A质谱图(Balibar et al.,Nature Chemical Biology,2007,3(9):584-592)作比较,鉴定为Terrequinone A。具体LC-MS检测条件:TSQ Quantum-Accela型液质联用仪;岛津Shim-packGIST C18色谱柱(150mm×2.1mm,3μm);流动相为A为含0.1%的甲酸水溶液,流动相B为含0.1%的甲酸乙腈,采用梯度洗脱:0-3min:20%B;3min-13min:20%B-90%B。流速0.2μL/min。柱温为35℃。进样量为1μL。离子源采用ESI+模式,电喷雾电压为3500V,鞘气流速为13mL/min,离子传输管温度为275℃,扫描模式为全扫描模式,扫描分辨率选择为0.4Da,采集的质荷比范围为m/z=300-500Da,扫描时间为0.5s。
通过HPLC检测Terrequinone A含量,具体HPLC检测条件:安捷伦1100高效液相色谱系统;C18柱(4.6×150mm,5μm);流动相为0.1%三氟乙酸乙腈水溶液,20min内从5%到100%梯度洗脱,流速为1ml/min;柱温为35℃;检测波长为280nm;进样量为20μL。测得Terrequinone A含量为41.9mg/L(图5)。
实施例6底物添加量对重组大肠杆菌BL-3生产Terrequinone A的影响
挑取实施例3中获得的重组大肠杆菌BL-3单菌落,接种于50ml含100μg/ml氨苄霉素和50μg/ml卡那霉素的优化后的M9液体培养基中,37℃培养至菌液OD600达到0.6时,加入0.2%阿拉伯糖,继续在25℃培养16h,向发酵液中添加0.75g/L的L-色氨酸和不同浓度(0.32g/L、0.63g/L、0.95g/L、1.27g/L)的异戊烯醇,使L-色氨酸与异戊烯醇物质的量比分别为1:1、1:2、1:3和1:4,然后在30℃培养24h,分别检测不同底物添加量下BL-3发酵液中Terrequinone A的含量。如图6所示,本发明的重组大肠杆菌在L-色氨酸与异戊烯醇物质的量比为1:3时(0.75g/L的L-色氨酸和0.95g/L的异戊烯醇),发酵液中Terrequinone A的含量可达到106.3mg/L,而天然菌株土曲霉Aspergillus terreus经过28天的培养后,从5.4L的发酵液中可分离得到6.0mg Terrequinone A粉末。结果表明,本发明的重组大肠杆菌BL-3在转化速率和Terrequinone A产物浓度上均有显著提高。
以上所述的,仅为本发明的较佳实施例,并非用以限定本发明的范围,本发明的上述实施例还可以做出各种变化。凡是依据本发明申请的权利要求书及说明书内容所作的简单、等效变化与修饰,皆落入本发明专利的权利要求保护范围。本发明未详尽描述的均为常规技术内容。
Claims (10)
1.一种在大肠杆菌中表达生产Terrequinone A的基因组合,其特征在于,所述基因组合包括tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因,其中,所述tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因的核苷酸序列如SEQ ID NO.1~8所示。
2.一种用于生产Terrequinone A的重组质粒pC02,其特征在于,所述重组质粒pC02由基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES、T7 sfpS按顺序串联并连接到大肠杆菌表达载体上构建而成,其中,所述基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES、T7 sfpS由核苷酸序列如SEQ ID NO.1~6所示的tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因分别与T7启动子和终止子连接而成。
3.根据权利要求2所述的重组质粒pC02,其特征在于,所述大肠杆菌表达载体为pCAMBIA1301。
4.一种用于生产Terrequinone A合成所需原料二甲基烯丙基焦磷酸DMAPP的重组质粒pU03,其特征在于,所述重组质粒pU03由基因表达盒T7 ScCKS和T7 AtIPKS按顺序串联并连接到大肠杆菌表达载体上构建而成,其中,所述基因表达盒T7 ScCKS和T7 AtIPKS由核苷酸序列如SEQ ID NO.7~8所示的ScCKS基因和AtIPKS基因分别与T7启动子和终止子连接而成。
5.根据权利要求4所述的重组质粒pU03,其特征在于,所述大肠杆菌表达载体为pUC19。
6.一种可生产Terrequinone A的重组大肠杆菌的制备方法,其特征在于,包括以下步骤:
S1:对tdiA基因、tdiB基因、tdiC基因、tdiD基因、tidE基因、sfp基因、ScCK基因和AtIPK基因按大肠杆菌表达模式优化,分别获得核苷酸序列如SEQ ID NO.1~8所示的tdiAS基因、tdiBS基因、tdiCS基因、tdiDS基因、tidES基因、sfpS基因、ScCKS基因和AtIPKS基因,将所述八个基因分别与T7启动子和终止子连接,构建基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES、T7 sfpS、T7 ScCKS和T7 AtIPKS;
S2:将步骤S1获得的六个基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7tidES和T7 sfpS按顺序串联并连接入大肠杆菌表达载体,获得含tdiAS、tdiBS、tdiCS、tdiDS、tidES和sfpS的六个基因表达盒的重组质粒pC02;
S3:将步骤S1获得的两个基因表达盒T7 ScCKS和T7 AtIPKS按顺序串联并连接入大肠杆菌表达载体,获得含ScCKS和AtIPKS的两个基因表达盒的重组质粒pU03;
S4:将步骤S2获得的重组质粒pC02和步骤S3获得的重组质粒pU03同时转化到大肠杆菌中,获得一种可生产Terrequinone A的重组大肠杆菌。
7.根据权利要求6所述重组大肠杆菌的制备方法,其特征在于,步骤S2中,将六个基因表达盒T7 tdiAS、T7 tdiBS、T7 tdiCS、T7 tdiDS、T7 tidES和T7 sfpS按顺序串联,并在T7tdiAS的5’-端连接EcoRⅠ内切酶位点,在T7 sfpS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7 tdiAS-T7tdiBS-T7 tdiCS-T7 tdiDS-T7 tidES-T7 sfpS-HindⅢ。
8.根据权利要求6所述重组大肠杆菌的制备方法,其特征在于,步骤S3中,将两个基因表达盒T7 ScCKS和T7 AtIPKS按顺序串联,并在T7 ScCKS的5’-端连接EcoRⅠ内切酶位点,在T7 AtIPKS的3’-端连接HindⅢ内切酶位点,获得EcoRⅠ-T7 ScCKS-T7 AtIPKS-HindⅢ。
9.一种根据权利要求6~8中任意一项所述的制备方法获得的可生产Terrequinone A的重组大肠杆菌。
10.一种利用重组大肠杆菌生产Terrequinone A的方法,其特征在于,将根据权利要求9所述的重组大肠杆菌接种于含100μg/ml氨苄霉素和50μg/ml卡那霉素的M9液体培养基中,37℃培养至菌液OD600达到0.6时,加入0.2%阿拉伯糖,继续在25℃培养14~18h,向发酵液中添加底物L-色氨酸和异戊烯醇,然后在30℃培养22~26h,即可生产Terrequinone A;其中,每升所述M9液体培养基包括:15g甘油,6g Na2HPO4,3g KH2PO4,1g NH4Cl,0.5g NaCl,0.12g MgSO4,0.011g CaCl2,2.9mg ZnSO4·7H2O,0.2mL 1%(w/v)维生素B1,5g水解酪蛋白。
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