CN110684811B - 一种提高甲硫氨酸产量的方法 - Google Patents
一种提高甲硫氨酸产量的方法 Download PDFInfo
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- CN110684811B CN110684811B CN201911103472.9A CN201911103472A CN110684811B CN 110684811 B CN110684811 B CN 110684811B CN 201911103472 A CN201911103472 A CN 201911103472A CN 110684811 B CN110684811 B CN 110684811B
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Abstract
本发明公开了一种提高甲硫氨酸产量的方法,所述方法为:将胱硫醚‑γ‑合酶基因、同型半胱氨酸甲基转移酶基因或甲硫氨酸甲基转移酶基因中的一种或多种导入宿主菌构建重组基因工程菌,将重组基因工程菌发酵培养,获得含甲硫氨酸发酵液,发酵液分离纯化获得甲硫氨酸。本发明方法通过增加甲硫氨酸合成过程中甲基的供应和高半胱氨酸的含量,其中工程菌E.coli BL21(DE3)pBlunt‑E1‑CGS‑MMT‑HMT发酵产生甲硫氨酸的产量是0.3g/L,相对于野生型E.coli BL21(DE3)菌株,甲硫氨酸的产量增加了9倍,显著提高了反应效率。
Description
(一)技术领域
本发明涉及一种来自植物甲硫氨酸合成途径的多酶组合在微生物中发酵合成甲硫氨酸的应用方法,属于基因工程和生物发酵领域。
(二)背景技术
甲硫氨酸(Methionine,Met)是人类的必需氨基酸,必须从食物中获得。在生物体内甲硫氨酸在蛋白翻译起始、调节代谢、重要化合物前体等方面具有重要的生理生化功能。植物和微生物都可以通过从头合成途径-天冬氨酸合成途径合成甲硫氨酸,此外植物还可以通过一条补充途径S-甲基甲硫氨酸循环(SMM循环)在植物种子的发育过程中通过甲基循环大量提供甲硫氨酸。植物中胱硫醚-γ-合酶(CGS)催化O-乙酰-L-高丝氨酸与半胱氨酸合成胱硫醚,进而合成高半胱氨酸,是甲硫氨酸合成的限速酶,受到产物Met和S-腺苷甲硫氨酸(SAM)的反馈抑制。高半胱氨酸甲基转移酶(HMT)和甲硫氨酸甲基转移酶(MMT)是SMM循环中的两个关键酶。HMT将高半胱氨酸在SMM或SAM作为甲基供体时转化成2分子的甲硫氨酸;MMT是将甲硫氨酸与高半胱氨酸共同合成SMM,从而实现SMM循环。SMM循环可以在短期内实现植物种子发育所需Met的大量提供。
甲硫氨酸合成途径已经被解析,但生物体内甲硫氨酸的合成普遍较低,因而工业上甲硫氨酸基本通过化学法合成。化学法合成Met主要以丙烯醛、甲硫醇和氢氰酸为原料合成Met的外消旋体(D-和L-Met),再通过外消旋体分离获得L-Met。尽管化学法工艺成熟,但仍存在其合成原料有毒,能耗高且过程复杂等问题。目前生物法合成Met的研究还在积极探索。生物法合成Met包括两种即酶法合成和生物发酵。目前酶法合成产量相对较高,约40g/L,但过程较为复杂,先通过发酵合成中间产物高丝氨酸,再通过将酶与发酵细胞产生的高丝氨酸以及底物甲硫醇催化合成Met。生物发酵法主要聚焦于对大肠杆菌和谷氨酸棒状杆菌等自身Met合成途径进行改造,通过葡萄糖发酵直接产生Met,具体改造途径包括提高Met的合成前体天冬氨酸、高半胱氨酸等的合成,解除合成途径关键酶的反馈抑制如:天冬氨酸激酶、胱硫醚-γ-合酶等,减少竞争途径如赖氨酸和苏氨酸的合成,减少下游产物S-甲基甲硫氨酸的合成等。目前Huang等2018年最新研究表明,通过对整个代谢途径的改造包括还原力NADPH途径,天冬氨酸前体合成途径,竞争性的赖氨酸和苏氨酸合成途径和甲硫氨酸合成内部途径等多个步骤的改造,并经过在发酵罐中的连续发酵(连续发酵可使产量比摇瓶提高10-20倍以上),甲硫氨酸的发酵水平已经达到16.86g/L,但是该研究仅局限于对大肠杆菌内部合成通路的改造和酶的过表达。尽管生物发酵法方法简单、能耗低、过程绿色无污染,但是距离工业化生产还有一定的距离。
目前尚未见生物法或酶法将植物中甲硫氨酸合成途径CGS及SMM循环关键酶应用到微生物中发酵合成甲硫氨酸的报道。
(三)发明内容
本发明在现有生物法合成甲硫氨酸的基础上,提供了一种提高甲硫氨酸产量的新的思路方法,具体是将植物甲硫氨酸合成途径特有的多酶组合应用到微生物,通过植物中的特异酶的过表达提高微生物中甲硫氨酸的含量,同时通过将微生物中苏氨酸的合成前体转化为甲硫氨酸,提高甲硫氨酸的含量。
本发明采用的技术方案:
本发明提供一种提高甲硫氨酸产量的方法,所述方法为:将胱硫醚-γ-合酶基因、同型半胱氨酸甲基转移酶基因或甲硫氨酸甲基转移酶基因中的一种或多种导入宿主菌构建重组基因工程菌,将重组基因工程菌发酵培养,获得含甲硫氨酸发酵液,发酵液分离纯化获得甲硫氨酸。所述宿主菌优选为大肠杆菌E.coli BL21(DE3)。
所述胱硫醚-γ-合酶(CGS)基因源自拟南芥(Arabidopsis thaliana),核苷酸序列为SEQ ID No.1所示,氨基酸序列为SEQ ID No.2所示。所述同型半胱氨酸甲基转移酶(HMT)基因源自大豆(Glycine max),核苷酸序列为SEQ ID No.3所示,氨基酸序列为SEQ IDNo.4所示。所述甲硫氨酸甲基转移酶(MMT)基因源自大豆(Glycine max),核苷酸序列为SEQID No.5所示,氨基酸序列为SEQ ID No.6所示。其中同型半胱氨酸甲基转移酶以及甲硫氨酸甲基转移酶为大豆(Glycine max)SMM循环中酶。
本发明所述重组基因工程菌按如下方法之一构建:(1)单酶体系:将胱硫醚-γ-合酶基因、同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因分别插入到质粒pBlunt-E1上得到重组质粒pBlunt-E1-CGS、pBlunt-E1-HMT和pBlunt-E1-MMT;将重组质粒分别导入大肠杆菌E.coli BL21(DE3)中,获得相应的工程菌E.coli BL21(DE3)pBlunt-E1-CGS、E.coli BL21(DE3)pBlunt-E1-HMT、E.coli BL21(DE3)pBlunt-E1-MMT;(2)双酶体系:同时将同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因串联插入到质粒pBlunt-E1上,重组质粒pBlunt-E1-HMT-MMT;将重组质粒导入大肠杆菌E.coli BL21(DE3)中,获得重组基因工程菌E.coli BL21(DE3)pBlunt-E1-HMT-MMT;(3)三酶体系:将胱硫醚-γ-合酶基因、同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因串联插入质粒pBlunt-E1上,获得重组质粒pBlunt-E1-CGS-HMT-MMT,将重组质粒分别导入大肠杆菌中获得重组基因工程菌E.coli BL21(DE3)pBlunt-E1-CGS-HMT-MMT。
本发明优选以共表达胱硫醚-γ-合酶和同型半胱氨酸甲基转移酶以及甲硫氨酸甲基转移酶的重组基因工程菌进行生物发酵合成甲硫氨酸。在同一反应体系中CGS为甲硫氨酸的合成提供大量的高半胱氨酸前体,HMT与SMM实现甲硫氨酸合成过程中的甲基循环。
本发明所述重组基因工程菌发酵培养方法为:将工程菌接种至发酵培养基中,在28℃、180rpm条件下进行发酵培养(优选摇瓶发酵48h),获得含甲硫氨酸的发酵液,发酵液离心,分离纯化获得甲硫氨酸;所述发酵培养基终浓度组成为:葡萄糖20g/L,NaS2O3 16g/L,酵母粉2g/L,KH2PO4 1g/L,MgSO4 1g/L,CaCO3 10g/L,FeSO4 0.01g/L,MnSO4 0.01g/L,ZnSO4 0.01g/L,溶剂为水,pH自然。
本发明所述重组基因工程菌发酵前先进行诱导培养,具体如下:将重组基因工程菌接种于含有终浓度100μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养过夜,取培养物以体积浓度1-2%的接种量转接于50mL含有100μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm培养至菌体浓度OD600为0.6~0.8,向培养物中加入终浓度0.5mM的IPTG,在25℃,140rpm下诱导培养14h,然后于4℃和5000rpm离心收集湿菌体,并用发酵培养基重悬湿菌体洗涤2次,将湿菌体以1g/50ml的量接种至发酵培养基进行发酵。
本发明针对甲硫氨酸合成途径内部的两个步骤进行改造,首先是实现植物与微生物甲硫氨酸合成途径的整合,将植物中特异的HMT和MMT基因在微生物中过表达,实现植物中甲基循环在微生物中的应用,提高甲基循环;其次,植物中的CGS在微生物中同时利用苏氨酸的合成前体,因而可以将苏氨酸的合成通量部分转换到甲硫氨酸的合成中,提高甲硫氨酸的产量。
与现有技术相比,本发明的有益效果主要体现在:常规的方法基本都在微生物本身进行代谢改造,包括增加甲硫氨酸前体物质的含量,减少甲硫氨酸竞争途径的碳通量,减少甲硫氨酸的代谢以及增加甲硫氨酸向外运输的运输蛋白。本发明提供了一种将植物中多酶组合用于微生物代谢甲硫氨酸合成中,为甲硫氨酸合成提供了一种新思路。所述方法通过增加甲硫氨酸合成过程中甲基的供应和高半胱氨酸的含量,其中工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT发酵产生甲硫氨酸的产量是0.3g/L,相对于野生型E.coliBL21(DE3)菌株,甲硫氨酸的产量增加了9倍,显著提高了反应效率。
(四)附图说明
图1为甲硫氨酸合成途径改造示意图;CGS,源自改造后的Arabidopsis thaliana的胱硫醚-γ-合成酶;HMT,源自Glycine max的同型半胱氨酸甲基转移酶;MMT,源自Glycine max的甲硫氨酸甲基转移酶。
图2为单酶、双酶和三酶表达载体构建示意图;单酶pBlunt-E1-CGS、pBlunt-E1-HMT和pBlunt-E1-MMT;双酶pBlunt-E1-MMT-HMT;三酶:pBlunt-E1-CGS-MMT-HMT。
图3为表达源自Arabidopsis thaliana的胱硫醚-γ-合成酶编码基因CGS、源自Glycine max的同型半胱氨酸甲基转移酶编码基因HMT和甲硫氨酸甲基转移酶编码基因MMT单酶、双酶和三酶体系基因工程菌的SDS-PAGE胶图。其中1号泳道为Control空菌株E.coliBL21(DE3),7号泳道为Control空载体E.coli BL21(DE3)pBlunt-E1诱导前菌体,2号泳道为Control空载体E.coli BL21(DE3)pBlunt-E1诱导后菌体,3号泳道为E.coli BL21(DE3)pBlunt-E1-CGS诱导后菌体,4号泳道为E.coli BL21(DE3)pBlunt-E1-HMT诱导后菌体,5号泳道为E.coli BL21(DE3)pBlunt-E1-MMT诱导后菌体,6号泳道为标准分子量,8号泳道为E.coli BL21(DE3)pBlunt-E1-HMT-MMT诱导后菌体,9号泳道为E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT诱导后菌体。
图4实施例1甲硫氨酸标准样品的液相色谱分析图。
图5单酶、双酶和三酶体系在大肠杆菌体内发酵产生甲硫氨酸的效价比较,每组分别对应发酵时间12、24、36和48h。
(五)具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此:
LB培养基组成:酵母提取物5g/L,蛋白胨10g/L,NaCl 10g/L,溶剂为水,pH自然。
发酵培养基组成:葡萄糖20g/L,NaS2O3 16g/L,酵母粉2g/L,KH2PO4 1g/L,MgSO41g/L,CaCO3 10g/L,FeSO4 0.01g/L,MnSO4 0.01g/L,ZnSO4 0.01g/L,溶剂为水,pH自然。
实施例1:大肠杆菌单酶体系工程菌的构建及产甲硫氨酸的应用
1、工程菌的构建
(1)拟南芥胱硫醚-γ-合酶(CGS)编码基因经序列优化后连接到pBlunt-E1,得到重组质粒pBlunt-E1-CGS;
根据NCBI数据库登录序列,将源自拟南芥(Arabisopsis thaliana)的胱硫醚-γ-合酶(CGS)编码基因(NM_110977.3)进行密码子优化,合成在pET28b质粒上,利用设计的引物F1和R1(CGS)进行PCR扩增,扩增体系见表1所示。
表1PCR扩增CGS反应体系
引物设计如下:
F1,5′-AGTGATGGTAGTCTGACCGTGC-3′;
R1,5′-CATATGTATATCTCCTTCTTATACTTAACTAATATAC-3′。
PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,55℃复性20sec,72℃保持20sec为一个循环,重复这样循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。纯化后的PCR产物与载体pBlunt-E1相连,连接产物转入大肠杆菌Trans-T1感受态细胞中。利用菌落PCR方法检测并确定阳性重组菌。从阳性重组菌中提取质粒,进行基因测序验证,将所得序列与合成的胱硫醚-γ-合酶基因(CGS,核苷酸序列为SEQ IDNO.1)序列进行比对分析,将含有正确片段的质粒命名为pBlunt-E1-CGS。
(2)大豆同型半胱氨酸甲基转移酶(HMT)编码基因经序列优化后连接到pBlunt-E1得到重组质粒pBlunt-E1-HMT;
根据NCBI数据库登录序列,对源自Glycine max的大豆同型半胱氨酸甲基转移酶(HMT)编码基因(XM_003554216.4)进行密码子优化,合成在pET28b质粒上,利用设计的引物F2和R2(HMT)进行PCR扩增,扩增体系见表2所示。
表2 PCR扩增HMT反应体系
F2,5′-ATGAGCTCTTTAATTACCGATCTGCT-3′;
R2,5′-TTAAATGCTCTGACTGCTACTTAAAGTGC-3′。
PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,55℃复性20sec,72℃保持20sec为一个循环,重复这样循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。纯化后的PCR产物与载体pBlunt-E1相连,连接产物转入大肠杆菌Trans-T1感受态细胞中。利用菌落PCR方法检测并确定阳性重组菌。从阳性重组菌中提取质粒,进行基因测序验证,将所得序列与合成的同型半胱氨酸甲基转移酶基因(HMT,核苷酸序列为SEQ IDNO.3)序列进行比对分析,将含有正确片段的质粒命名为pBlunt-E1-HMT。
(3)大豆甲硫氨酸甲基转移酶(MMT)编码基因经序列优化后连接到pBlunt-E1得到重组质粒pBlunt-E1-MMT;
将源自Glycine max的大豆甲硫氨酸甲基转移酶(MMT)的编码基因(NM_001368758.1)进行密码子优化,合成在pET28b质粒上,利用设计的引物F3和R3(MMT)进行PCR扩增,扩增体系见表3所示。
表3 PCR扩增MMT反应体系
F3,5′-ATGAGCTGGATGAGTGTGGATG-3′;
R3,5′-TTAACCCAGTGCAACTTCTTTAAATTTTA-3′。
PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,55℃复性20sec,72℃保持20sec为一个循环,重复这样循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。纯化后的PCR产物与载体pBlunt-E1相连,连接产物转入大肠杆菌Trans-T1感受态细胞中。利用菌落PCR方法检测并确定阳性重组菌。从阳性重组菌中提取质粒,进行基因测序验证,将所得序列与合成的大豆甲硫氨酸甲基转移酶基因(MMT,核苷酸序列为SEQ IDNO.5所示)的序列进行比对分析,将含有正确片段的质粒命名为pBlunt-E1-MMT。
2、诱导表达
用质粒提取试剂盒分别从各自的Trans-T1重组菌中提取重组质粒pBlunt-E1-CGS、pBlunt-E1-HMT和pBlunt-E1-MMT,并将其分别转化至E.coli BL21(DE3)感受态细胞中,并涂布于含100μg/mL氨苄青霉素的LB抗性平板上,37℃培养箱中培养过夜。挑取阳性重组菌接种于50mL含100μg/mL氨苄青霉素的LB液体培养基中,在37℃和200rpm条件下培养12h,作为种子液。然后按体积浓度1%的接种量接种至50mL含100μg/mL氨苄青霉素的LB液体培养基中,在相同条件下培养至菌液浓度(OD600)为0.7时,添加诱导剂IPTG(异丙基-β-D-硫代吡喃半乳糖苷)至终浓度为0.4mM,在25℃和140rpm下继续培养14h诱导过量表达目的蛋白,离心收集诱导后的湿菌体,获得工程菌E.coli BL21(DE3)pBlunt-E1-CGS、coliBL21(DE3)pBlunt-E1-HMT和E.coli BL21(DE3)pBlunt-E1-MMT。
同样条件下,以E.coli BL21(DE3)及转化空载体pBlunt-E1的E.coli BL21(DE3)pBlunt-E1为对照。
重组蛋白检测:将收集的诱导后菌液取1mL于12000rpm离心2分钟后弃上清,加100μL超纯水进行重悬,取18μL与6μL 4×SDS-PAGE Loading Buffer沸水煮10min进行上样。经SDS-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测,结果见图3中泳道3-泳道5,重组的CGS、HMT和MMT为可溶性蛋白,其分子量大小为43kDa、36.3kDa和120kDa,在目的条带附近有条带加粗,确认重组蛋白已经实现成功诱导。
3、重组菌发酵液的液相分析
分别将诱导后的工程菌E.coli BL21(DE3)、E.coli BL21(DE3)pBlunt-E1-CGS、E.coliBL21(DE3)pBlunt-E1-HMT和E.coli BL21(DE3)pBlunt-E1-MMT在4℃、500rpm离心,收集湿菌体,称取1g湿菌体接种至50mL发酵培养基中,在28℃、200rpm下进行摇瓶发酵培养48h,其中每隔12h取发酵液一次进行检测。发酵完成后,将发酵液于12000rpm离心2min,离心后取上清液100μL,先加100μLpH=9.0的NaHCO3溶液,再加100μL2,4-二硝基氟苯乙腈,60℃避光水浴反应1h,将反应后的溶液与700μL pH=7.0的磷酸盐缓冲液混匀,混合液于12000rpm离心2min,取上清,上清经0.22μm滤膜过滤后进行高效液相色谱分析。
从发酵的结果来看,E.coli BL21(DE3)生产甲硫氨酸的产量约是0.04g/L,工程菌E.coli BL21(DE3)pBlunt-E1-CGS,E.coliBL21(DE3)pBlunt-E1-HMT和E.coli BL21(DE3)pBlunt-E1-MMT生产甲硫氨酸的产量分别是0.14g/L、0.08g/L、0.06g/L,工程菌相对于野生型E.coli BL21(DE3)产量分别增加3.5倍、2倍和1.5倍。
色谱条件:色谱柱Welchrom C18柱(4.6*250mm,5μm),流动相为0.025M的醋酸钠水溶液与甲醇体积比1:1混合;流速为1mL/min;柱温40℃;检测波长360nm;进样量10μL。
实施例2:工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT的构建及产甲硫氨酸的应用
1、工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT的构建
(1)pBlunt-E1-HMT-MMT载体的构建
设计MMT的同源重组引物F4和R4,将MMT同源重组到载体pBlunt-E1-HMT上,构建pBlunt-E1-HMT-MMT重组载体。具体步骤是以合成的MMT基因为模板,以F4和R4为引物进行PCR扩增,获得MMT基因片段,扩增体系见表4所示。
表4 MMTPCR扩增反应体系
引物设计如下:
F4,
5′-TAAGAAGGAGATATACATATGATGAGCTCTTTAATTACCGATCTGCT-3′;
R4,
5′-AGCAGCGGTTTCTTTACCAGACTCGAGTTAAATGCTCTGACTGCTACTTA AAGTGC-3′。PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,55℃复性20sec,72℃保持1min为一个循环,重复循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。
提取实施例1中构建的pBlunt-E1-HMT质粒,以Xho I和Nde I限制性内切酶酶切pBlunt-E1-HMT载体,酶切体系如表5所示。
表5pBlunt-E1-HMT酶切体系
将酶切后的pBlunt-E1-HMT载体进行纯化,经NanoDrop 2000c测量,浓度为25ng/μL,上述PCR扩增的MMT基因重组片段,回收浓度为60ng/μL,将两者通过One-Step Clone法进行重组连接,连接体系如表6所示。
表6 重组反应体系
将上述体系加好后,37℃连接30min,将连接后的产物转化E.coli BL21(DE3)感受态细胞,并涂布于含50μg/mL氨苄霉素的LB抗性平板上,37℃培养箱中培养过夜。挑取阳性重组菌接种于50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃,200rpm条件下培养12h,取2mL菌液送公司测序,将测序后序列与合成的大豆甲硫氨酸甲基转移酶(MMT核苷酸序列为SEQ IDNO.5)序列进行比对分析,将含有正确片段的质粒命名为pBlunt-E1-HMT-MMT。将质粒pBlunt-E1-HMT-MM转化到E.coli BL21(DE3)中获得E.coli BL21(DE3)pBlunt-E1-MMT-HMT的重组工程菌。
将上述构建成功的工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT接种于50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养12h,作为种子液。
然后按体积浓度2%接种量将工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT接种至50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃、200rpm培养至菌液浓度(OD600)约为0.7时,添加诱导剂IPTG(异丙基-β-D-硫代吡喃半乳糖苷)至终浓度为0.5mM,在25℃,140rpm下继续培养14h过量表达目的蛋白,然后培养液离心,收集湿菌体。
重组蛋白检测:将收集的诱导后菌液取1mL于12000rpm离心2分钟后弃上清,加100μL超纯水进行重悬,取18μL与6μL 4×SDS-PAGE Loading Buffer沸水煮10min进行上样。经SDS-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测有目的条带加粗。重组HMT+MMT为可溶性蛋白,其分子量大小表观为36.3kDa、120kDa(图3,泳道8)。工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT已成功诱导表达。
2、工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT的发酵及产甲硫氨酸分析
将成功诱导后的工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT于4℃、500rpm离心后收集湿菌体,称取1g湿菌体接种至50mL发酵培养基中,在28℃、200rpm下进行摇瓶发酵48h,且每隔12h取发酵液一次。将发酵液12000rpm离心2min,取上清液100μL,加100μL pH=9.0的NaHCO3溶液,再加100μL 2,4-二硝基氟苯乙腈,60℃避光水浴反应1h,将反应后的溶液与700μL pH=7.0的磷酸盐缓冲液混匀,将混合液于12000rpm离心2min,取上清,上清液经0.22μm滤膜过滤后进行高效液相色谱分析。色谱条件同实施例1。
液相结果显示,工程菌E.coli BL21(DE3)pBlunt-E1-MMT-HMT发酵产生甲硫氨酸的产量是0.09g/L,相对于野生型菌株E.coli BL21(DE3)产量增加了2.2倍。
实施例3:工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT的构建及产甲硫氨酸的应用
(1)工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT的构建
以实施例1和实施例2中的pBlunt-E1-CGS和pBlunt-E1-MMT-HMT质粒为模板,并分别以引物对F1R1和F5R5为引物,分别获取CGS与MMT-HMT基因序列,PCR扩增程序如表7:
表7MMT-HMT扩增体系
引物设计如下:F5,5′-ATTCTGCAAGCTTTAGAAGCCATTTAATAATACGACTCACTATAGGGGAAT TGTGAG-3′;R5,5′-TCAAGATTTTTCTCTTAAAGCATTTGAAATA-3′。PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,59℃复性20sec,72℃保持1min20sec为一个循环,重复这样循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。
将上述得到的CGS和MMT-HMT的PCR产物纯化回收,继续通过Overlap PCR扩增以F6、R6引物对为引物将CGS与MMT-HMT连接,具体程序如表8:
表8CGS-MMT-HMToverlap PCR扩增体系
引物设计如下:F6,5′-AGTGATGGTAGTCTGACCGTGCACG-3′;R6,5′-TCAAGATTTTTCTCTTAAAGCATTTGAAATA-3′。PCR反应进程为:95℃预变性2min;之后,以95℃变性20sec,59℃复性20sec,72℃保持1.5min为一个循环,重复循环30次;最后,72℃保持5min。PCR产物经1%琼脂糖凝胶电泳检测并回收。
纯化后的PCR产物与载体pBlunt-E1相连,连接产物转入大肠杆菌Trans-T1感受态细胞中。利用菌落PCR方法检测并确定阳性重组子,挑取阳性重组子接种于50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养12h,取2mL菌液送公司测序,将测序后序列与合成的胱硫醚-γ-合酶基因(CGS,核苷酸序列为SEQ ID NO.1)、同型半胱氨酸甲基转移酶(HMT,核苷酸序列为SEQ IDNO.3)、大豆甲硫氨酸甲基转移酶(MMT核苷酸序列为SEQIDNO.5)序列进行比对分析,将同时含有上述三种基因的质粒命名为pBlunt-E1-CGS-MMT-HMT。
将上述构建成功的质粒pBlunt-E1-CGS-MMT-HMT转化到E.coli BL21(DE3),获得工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT的阳性菌株,将该菌株接种于50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养12h,作为种子液。
然后按体积浓度2%的接种量将工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT接种至50mL含50μg/mL氨苄霉素的LB液体培养基中,在37℃、200rpm条件下培养至菌液浓度(OD600)为0.7时,添加诱导剂IPTG(异丙基-β-D-硫代吡喃半乳糖苷)至终浓度为0.5mM,在25℃和140rpm下继续培养14h过量表达目的蛋白。培养液离心,收集湿菌体。
重组蛋白检测:将收集的诱导后菌液取1mL于12000rpm离心2分钟后弃上清,加100μL超纯水进行重悬,取18μL与6μL 4×SDS-PAGE Loading Buffer沸水煮10min进行上样。经SDS-聚丙烯酰胺凝胶电泳(SDS-PAGE)检测有目的条带加粗。重组的CGS+HMT+MMT均为可溶性蛋白,其分子量大小表观为43.9kDa、36.3kDa、120kDa,重组蛋白诱导表达成功见图3泳道9。
(2)工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT发酵及液相分析
将诱导培养后的工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT于4℃、500rpm离心后收集湿菌体,称取1g湿菌体接种至50mL发酵培养基中,在28℃、200rpm下进行摇瓶发酵48h,每隔12h取发酵液一次。发酵完成后,将发酵液12000rpm离心2min,离心后取上清液100μL,先加100μL pH=9.0的NaHCO3溶液,再加100μL 2,4-二硝基氟苯乙腈,60℃避光水浴反应1h,将反应后的溶液与700μL pH=7.0的磷酸盐缓冲液混匀,混合液于12000rpm离心2min,取上清,上清液经0.22μm滤膜过滤后进行高效液相色谱分析。色谱条件同实施例1。
从液相结果看,工程菌E.coli BL21(DE3)pBlunt-E1-CGS-MMT-HMT发酵产生甲硫氨酸的产量是0.3g/L,相对于野生型E.coli BL21(DE3)菌株,甲硫氨酸的产量增加了9倍。
序列表
<110> 浙江工业大学
<120> 一种提高甲硫氨酸产量的方法
<160> 6
<170> SIPOSequenceListing 1.0
<210> 1
<211> 1173
<212> DNA
<213> 未知(Unknown)
<400> 1
agtgatggta gtctgaccgt gcacgccggt gaacgtttag gtcgcggtat tgtgaccgac 60
gccatcacaa ccccggtggt gaataccagc gcctattttt tcaagaaaac cgccgagctg 120
attgatttta aagaaaaacg cagcgttagc tttgagtacg gccgttacgg taatccgacc 180
accgtggtgc tggaagacaa aattagcgct ttagaaggtg cagagagcac tttagttatg 240
gccagcggta tgtgcgcaag caccgttatg ctgctggctt tagttccggc cggtggtcac 300
attgtgacca ccaccgactg ctatcgcaag acccgtatct tcatggaaaa ctttttaccg 360
aagctgggca tcacagtgac agtgatcgat ccggcagata ttgccggttt agaggccgca 420
gtgaatgagt ttaaagtttc tctgttcttt accgaaagcc cgaccaaccc gtttctgcgc 480
tgcgtggata tcgagctggt gagcaaaatt tgccacaaac gcggcacttt agtgtgtatt 540
gatggcacct tcgcaacccc tctgaaccag aaagccttag cactgggtgc cgatctggtg 600
gtgcacagcg ccaccaaata tatcggcggc cataatgacg tgctggctgg ttgcatctgc 660
ggttctttaa aactggtgag cgaaatccgc aatttacatc atgttctggg cggtacttta 720
aatccgaacg ccgcctatct gatcatccgc ggtatgaaaa ctttacattt acgtgtgcag 780
cagcagaata gcaccgcatt ccgtatggcc gaaattttag aagcccatcc gaaagtttct 840
cacgtgtatt atccgggttt acctagtcat ccggagcatg aattagccaa gcgtcagatg 900
accggctttg gcggcgttgt tagtttcgag atcgacggcg acatcgagac aaccattaaa 960
tttgtggatt ctttaaaaat cccgtacatc gccccgagtt tcggtggttg cgaaagcatc 1020
gtggatcagc cggccattat gagctattgg gatctgccgc aagaggaacg tctgaaatac 1080
ggcatcaagg acaatttagt gcgcttcagc ttcggcgttg aggatttcga ggacgtgaag 1140
gccgacattc tgcaagcttt agaagccatt taa 1173
<210> 2
<211> 390
<212> PRT
<213> 未知(Unknown)
<400> 2
Ser Asp Gly Ser Leu Thr Val His Ala Gly Glu Arg Leu Gly Arg Gly
1 5 10 15
Ile Val Thr Asp Ala Ile Thr Thr Pro Val Val Asn Thr Ser Ala Tyr
20 25 30
Phe Phe Lys Lys Thr Ala Glu Leu Ile Asp Phe Lys Glu Lys Arg Ser
35 40 45
Val Ser Phe Glu Tyr Gly Arg Tyr Gly Asn Pro Thr Thr Val Val Leu
50 55 60
Glu Asp Lys Ile Ser Ala Leu Glu Gly Ala Glu Ser Thr Leu Val Met
65 70 75 80
Ala Ser Gly Met Cys Ala Ser Thr Val Met Leu Leu Ala Leu Val Pro
85 90 95
Ala Gly Gly His Ile Val Thr Thr Thr Asp Cys Tyr Arg Lys Thr Arg
100 105 110
Ile Phe Met Glu Asn Phe Leu Pro Lys Leu Gly Ile Thr Val Thr Val
115 120 125
Ile Asp Pro Ala Asp Ile Ala Gly Leu Glu Ala Ala Val Asn Glu Phe
130 135 140
Lys Val Ser Leu Phe Phe Thr Glu Ser Pro Thr Asn Pro Phe Leu Arg
145 150 155 160
Cys Val Asp Ile Glu Leu Val Ser Lys Ile Cys His Lys Arg Gly Thr
165 170 175
Leu Val Cys Ile Asp Gly Thr Phe Ala Thr Pro Leu Asn Gln Lys Ala
180 185 190
Leu Ala Leu Gly Ala Asp Leu Val Val His Ser Ala Thr Lys Tyr Ile
195 200 205
Gly Gly His Asn Asp Val Leu Ala Gly Cys Ile Cys Gly Ser Leu Lys
210 215 220
Leu Val Ser Glu Ile Arg Asn Leu His His Val Leu Gly Gly Thr Leu
225 230 235 240
Asn Pro Asn Ala Ala Tyr Leu Ile Ile Arg Gly Met Lys Thr Leu His
245 250 255
Leu Arg Val Gln Gln Gln Asn Ser Thr Ala Phe Arg Met Ala Glu Ile
260 265 270
Leu Glu Ala His Pro Lys Val Ser His Val Tyr Tyr Pro Gly Leu Pro
275 280 285
Ser His Pro Glu His Glu Leu Ala Lys Arg Gln Met Thr Gly Phe Gly
290 295 300
Gly Val Val Ser Phe Glu Ile Asp Gly Asp Ile Glu Thr Thr Ile Lys
305 310 315 320
Phe Val Asp Ser Leu Lys Ile Pro Tyr Ile Ala Pro Ser Phe Gly Gly
325 330 335
Cys Glu Ser Ile Val Asp Gln Pro Ala Ile Met Ser Tyr Trp Asp Leu
340 345 350
Pro Gln Glu Glu Arg Leu Lys Tyr Gly Ile Lys Asp Asn Leu Val Arg
355 360 365
Phe Ser Phe Gly Val Glu Asp Phe Glu Asp Val Lys Ala Asp Ile Leu
370 375 380
Gln Ala Leu Glu Ala Ile
385 390
<210> 3
<211> 1002
<212> DNA
<213> 未知(Unknown)
<400> 3
atgagctctt taattaccga tctgctgcgt cagaccggtg gcaccgcagt gattgatggt 60
ggtctggcca ccgaactgga gcgccacggt gccgatctga atgatccgct gtggagcgca 120
aagtgtttat ttagcttccc gcatctgatc cgtcaagttc atttagatta tttagaaaac 180
ggcgccgaca tcattatcac agccagctac caagctacca tccaaggttt taaagccaaa 240
ggctacagcg acgaagagag cgaagcttta ctgcgcagca gcgtggaaat cgcccgtgaa 300
gcccgcgaag tgtactacaa aaactgcgcc ggttgtcgca gcggtgatgg tgatgatgat 360
ggccgcattt taaagcagcg cccgatttta gttgccgcaa gtgtgggtag ctatggtgcc 420
tatctggccg atggcagcga atatagcggt gactatggcg atgccatcac cgtggagaca 480
ctgaaggatt ttcatcgtcg ccgcgtgcag attttagccg atagtggtgc cgatttactg 540
gcctttgaga ccgtgccgaa taagctggag gccgaagcat atgcccagct gctggaagaa 600
gaagatatca aaatcccggc ttggtttagc ttcaacagca aggatggcgt gaacgttgtg 660
agcggtgatt ctttaatgga atgcggtagc atcgcagaga gctgtaacaa ggtggttgcc 720
gttggcatca attgcacccc gccgcgcttc attcatggct taatcgtgct gctgaagaaa 780
gtgaccacca agccgatcgt gatctatccg aacagcggcg agacctatga cgcagatctg 840
aaggaatggg tgcagaatac cggtgtgacc gacgaagatt ttattagtta tgttaacaaa 900
tggtgcgaac tgggcgccag cttagttggt ggttgctgcc gtaccacacc ggataccatc 960
cgcaagatct atcgcacttt aagtagcagt cagagcattt aa 1002
<210> 4
<211> 333
<212> PRT
<213> 未知(Unknown)
<400> 4
Met Ser Ser Leu Ile Thr Asp Leu Leu Arg Gln Thr Gly Gly Thr Ala
1 5 10 15
Val Ile Asp Gly Gly Leu Ala Thr Glu Leu Glu Arg His Gly Ala Asp
20 25 30
Leu Asn Asp Pro Leu Trp Ser Ala Lys Cys Leu Phe Ser Phe Pro His
35 40 45
Leu Ile Arg Gln Val His Leu Asp Tyr Leu Glu Asn Gly Ala Asp Ile
50 55 60
Ile Ile Thr Ala Ser Tyr Gln Ala Thr Ile Gln Gly Phe Lys Ala Lys
65 70 75 80
Gly Tyr Ser Asp Glu Glu Ser Glu Ala Leu Leu Arg Ser Ser Val Glu
85 90 95
Ile Ala Arg Glu Ala Arg Glu Val Tyr Tyr Lys Asn Cys Ala Gly Cys
100 105 110
Arg Ser Gly Asp Gly Asp Asp Asp Gly Arg Ile Leu Lys Gln Arg Pro
115 120 125
Ile Leu Val Ala Ala Ser Val Gly Ser Tyr Gly Ala Tyr Leu Ala Asp
130 135 140
Gly Ser Glu Tyr Ser Gly Asp Tyr Gly Asp Ala Ile Thr Val Glu Thr
145 150 155 160
Leu Lys Asp Phe His Arg Arg Arg Val Gln Ile Leu Ala Asp Ser Gly
165 170 175
Ala Asp Leu Leu Ala Phe Glu Thr Val Pro Asn Lys Leu Glu Ala Glu
180 185 190
Ala Tyr Ala Gln Leu Leu Glu Glu Glu Asp Ile Lys Ile Pro Ala Trp
195 200 205
Phe Ser Phe Asn Ser Lys Asp Gly Val Asn Val Val Ser Gly Asp Ser
210 215 220
Leu Met Glu Cys Gly Ser Ile Ala Glu Ser Cys Asn Lys Val Val Ala
225 230 235 240
Val Gly Ile Asn Cys Thr Pro Pro Arg Phe Ile His Gly Leu Ile Val
245 250 255
Leu Leu Lys Lys Val Thr Thr Lys Pro Ile Val Ile Tyr Pro Asn Ser
260 265 270
Gly Glu Thr Tyr Asp Ala Asp Leu Lys Glu Trp Val Gln Asn Thr Gly
275 280 285
Val Thr Asp Glu Asp Phe Ile Ser Tyr Val Asn Lys Trp Cys Glu Leu
290 295 300
Gly Ala Ser Leu Val Gly Gly Cys Cys Arg Thr Thr Pro Asp Thr Ile
305 310 315 320
Arg Lys Ile Tyr Arg Thr Leu Ser Ser Ser Gln Ser Ile
325 330
<210> 5
<211> 3276
<212> DNA
<213> 未知(Unknown)
<400> 5
atgagctgga tgagtgtgga tgaattttta gttcagtgta agaaaagtgg cgatgccgcc 60
tatgcctctt tacgcagttt actggaacgt ttagataatc cggaaacccg tagccaagct 120
cgcatctttt taagccatct gcagaaacgc ttccctacca aagacagttg tgaccagtgc 180
ttcgagacct accacttccg catcgaggat gttagtctgg gccagtatga aggtcaccat 240
ggccgcaaca agctgacaat gatggtgatc ccgagcatct ttttaccgga agattggagc 300
ttcacctttt acgagggtat caaccgccac cccgatagca tctttaagga gcgcaccgtg 360
gccgaactgg gctgtggtaa cggttggatc agcattgcca tggccgagaa atggctgccg 420
tataaggtgt atggtttaga catcaatccg cgcgccgtga aagtgagctg gattaactta 480
tatctgaatg ctttagatga aaatggccag ctgatttatg atgaggaaaa caagacactg 540
ctggatcgcg tggaattcca cgagagtgat ctgctgagct actgccgcga gaaagacatt 600
cagctggagc gtatcgtggg ttgcatcccg cagattctga acccgaaccc ggacgcaatg 660
agcaaaatga tcaccgaaaa cgccagcgag gaatttctgc acagtctgag taattactgc 720
gctttacaag gttttgtgga ggatcagttc ggtctgggct taatcgcccg cgcagtggaa 780
gaaggtattg ccgttattaa accgaccggt atcatgatct tcaatatggg cggccgtccg 840
ggccaagctg tttgcaaacg tttatttgag cgccgcggtt ttcgcattac aaagctgtgg 900
cagacaaaga ttatccaagc tggcgatacc gatatcgagg cactggtgga aatcgagaag 960
aacagcccgc accgtttcga gttctttatg ggtttaagtg gtgatcagcc gatctgtgcc 1020
cgtaccgcat ggacctatgg taaaagcggc ggcagtatta gccatgcttt aagcgtgtat 1080
agctgtcagc tgcgccaccc gaatcaagtt aaagccattt ttgactttct gaaacatggc 1140
tttcaagaga tcggcagctc tttagatctg agcttcgaag acgatagcgt ggccgacgag 1200
aaaattccgt ttttagccta tctggccagc cgtctgaaaa ataatagtta tttcccgtac 1260
gaaccgccgg ccggtagcaa acatttccgc aatttaatcg ctggttttct gaagacctac 1320
caccacattc cgctgaccag tgacaatgtg gttattttcc cgagccgcac agccgcaatt 1380
gagcatgctt tacgtttatt tagcccgcgt ctggccgttg ttgacgagca tctgacccgt 1440
catttaccgc gtcagtggct gaccagcagc actttagaga aaaacgccgg tacaattgac 1500
tctttagatg ataccatgat ggtgatcgaa gccccgcgcc agagcgattt aatgatcgaa 1560
ctgattaaaa agctgaaacc gaaggtggtg gttactggta ttgcccactt cgaagccgtg 1620
accagtagtg cctttgtgca tctgctggac acaacccgcg atattggcag ccgtttattt 1680
ttagacatca gcgaccactt tgaactgagc tctttacccg gtagtaatgg cgtgctgaag 1740
tatttaagcg gtaccccgtt accgagccac gccgccatta tctgcggtct ggttaagaat 1800
aaagtgtacc cggacttaga agtggccttc gtgatcagtg aggaagaatc tttactgaac 1860
gctttaagca agaccgttga gctgctggaa ggcaacaccg ctttaatcag ccagtattac 1920
tatggttgca ttttccatga actgctggcc ttccagctgg cagaccgtca cgcacccgct 1980
aaacgtaatt gcgaaaacgt gaaaagtgtt gatatgattg gttttgcacg tagcgcaacc 2040
agtgtgctga gcaacgccga actgagcatt gacggcgttg aaaatgagag cttaattcat 2100
atggatgttg accagatctt tttaccggtg ccgagcccgg ttaaagcagc catctttgag 2160
agcttcgccc gccagaatat gagcgagagc gaaaccgacg ttacagccag catcaaaggt 2220
tttgttaaaa gcaattatgg cttcccgacc gatagcagta ccgagttcat ctacgccgat 2280
aacagcaaag cattatttaa taaactggtt ctgtgctgta tcaaagaggg tggtacttta 2340
tgcttcccgg ctggtagtaa cggcaattat gttagcagtg cacgcttttt aaaagccgac 2400
attgtgacag tgccgaccga cgttaacgtg ggcttcaagt tcacagagaa aactttaacc 2460
ggcattttag gcaccgtgaa aaatccgtgg gtgtacatca gcggcccgac cgttaacccg 2520
accggtttaa tttatagtaa taacgaaatg gtggaaattt taagcacttg tgcacgcttt 2580
ggtgcacgcg tgattattga caccgccagc agtggtttag agttcgattg tgagggctgg 2640
ggcggctggg acatcgaagg ctgtttaagc aagctgaata gcagcatcaa gccgagcttc 2700
tgcgtgagtc tgctgggtgg tctgtcttta aaaatgctga acggtgttct gcgtttcggt 2760
tttttaattt taaatcagcc tattttagtg gacaccttct atagctaccc gggcttaagc 2820
aaacctcata ccacagcacg ctatgccacc aaaaagctgc tggaacgtcg tgaacagaag 2880
ccgagcagtc tgagcgatgc aatcgtggag cacacccaga ttttaaaaac acgcagtaag 2940
tgtttaaaag aggttttaca gaagagcggc tgggatgtgc tggaaagttg cgccggtgtg 3000
agcgttgtgg ccaaaccgag tgcctatctg aacaaaacaa ttaagctgaa aatcagctta 3060
gaaggcgaag ccagtcacgg cagcgccacc aaggagatta agctggacga cagcaacatt 3120
cgcaccgtga ttttaaaagc aactggttta tgcatcaata gcggtagctg gactggtatc 3180
ccgggctact gccgcttcaa cattgcttta gaagagaatg atttcaaaaa agctttagat 3240
tgcattttaa aatttaaaga agttgcactg ggttaa 3276
<210> 6
<211> 1091
<212> PRT
<213> 未知(Unknown)
<400> 6
Met Ser Trp Met Ser Val Asp Glu Phe Leu Val Gln Cys Lys Lys Ser
1 5 10 15
Gly Asp Ala Ala Tyr Ala Ser Leu Arg Ser Leu Leu Glu Arg Leu Asp
20 25 30
Asn Pro Glu Thr Arg Ser Gln Ala Arg Ile Phe Leu Ser His Leu Gln
35 40 45
Lys Arg Phe Pro Thr Lys Asp Ser Cys Asp Gln Cys Phe Glu Thr Tyr
50 55 60
His Phe Arg Ile Glu Asp Val Ser Leu Gly Gln Tyr Glu Gly His His
65 70 75 80
Gly Arg Asn Lys Leu Thr Met Met Val Ile Pro Ser Ile Phe Leu Pro
85 90 95
Glu Asp Trp Ser Phe Thr Phe Tyr Glu Gly Ile Asn Arg His Pro Asp
100 105 110
Ser Ile Phe Lys Glu Arg Thr Val Ala Glu Leu Gly Cys Gly Asn Gly
115 120 125
Trp Ile Ser Ile Ala Met Ala Glu Lys Trp Leu Pro Tyr Lys Val Tyr
130 135 140
Gly Leu Asp Ile Asn Pro Arg Ala Val Lys Val Ser Trp Ile Asn Leu
145 150 155 160
Tyr Leu Asn Ala Leu Asp Glu Asn Gly Gln Leu Ile Tyr Asp Glu Glu
165 170 175
Asn Lys Thr Leu Leu Asp Arg Val Glu Phe His Glu Ser Asp Leu Leu
180 185 190
Ser Tyr Cys Arg Glu Lys Asp Ile Gln Leu Glu Arg Ile Val Gly Cys
195 200 205
Ile Pro Gln Ile Leu Asn Pro Asn Pro Asp Ala Met Ser Lys Met Ile
210 215 220
Thr Glu Asn Ala Ser Glu Glu Phe Leu His Ser Leu Ser Asn Tyr Cys
225 230 235 240
Ala Leu Gln Gly Phe Val Glu Asp Gln Phe Gly Leu Gly Leu Ile Ala
245 250 255
Arg Ala Val Glu Glu Gly Ile Ala Val Ile Lys Pro Thr Gly Ile Met
260 265 270
Ile Phe Asn Met Gly Gly Arg Pro Gly Gln Ala Val Cys Lys Arg Leu
275 280 285
Phe Glu Arg Arg Gly Phe Arg Ile Thr Lys Leu Trp Gln Thr Lys Ile
290 295 300
Ile Gln Ala Gly Asp Thr Asp Ile Glu Ala Leu Val Glu Ile Glu Lys
305 310 315 320
Asn Ser Pro His Arg Phe Glu Phe Phe Met Gly Leu Ser Gly Asp Gln
325 330 335
Pro Ile Cys Ala Arg Thr Ala Trp Thr Tyr Gly Lys Ser Gly Gly Ser
340 345 350
Ile Ser His Ala Leu Ser Val Tyr Ser Cys Gln Leu Arg His Pro Asn
355 360 365
Gln Val Lys Ala Ile Phe Asp Phe Leu Lys His Gly Phe Gln Glu Ile
370 375 380
Gly Ser Ser Leu Asp Leu Ser Phe Glu Asp Asp Ser Val Ala Asp Glu
385 390 395 400
Lys Ile Pro Phe Leu Ala Tyr Leu Ala Ser Arg Leu Lys Asn Asn Ser
405 410 415
Tyr Phe Pro Tyr Glu Pro Pro Ala Gly Ser Lys His Phe Arg Asn Leu
420 425 430
Ile Ala Gly Phe Leu Lys Thr Tyr His His Ile Pro Leu Thr Ser Asp
435 440 445
Asn Val Val Ile Phe Pro Ser Arg Thr Ala Ala Ile Glu His Ala Leu
450 455 460
Arg Leu Phe Ser Pro Arg Leu Ala Val Val Asp Glu His Leu Thr Arg
465 470 475 480
His Leu Pro Arg Gln Trp Leu Thr Ser Ser Thr Leu Glu Lys Asn Ala
485 490 495
Gly Thr Ile Asp Ser Leu Asp Asp Thr Met Met Val Ile Glu Ala Pro
500 505 510
Arg Gln Ser Asp Leu Met Ile Glu Leu Ile Lys Lys Leu Lys Pro Lys
515 520 525
Val Val Val Thr Gly Ile Ala His Phe Glu Ala Val Thr Ser Ser Ala
530 535 540
Phe Val His Leu Leu Asp Thr Thr Arg Asp Ile Gly Ser Arg Leu Phe
545 550 555 560
Leu Asp Ile Ser Asp His Phe Glu Leu Ser Ser Leu Pro Gly Ser Asn
565 570 575
Gly Val Leu Lys Tyr Leu Ser Gly Thr Pro Leu Pro Ser His Ala Ala
580 585 590
Ile Ile Cys Gly Leu Val Lys Asn Lys Val Tyr Pro Asp Leu Glu Val
595 600 605
Ala Phe Val Ile Ser Glu Glu Glu Ser Leu Leu Asn Ala Leu Ser Lys
610 615 620
Thr Val Glu Leu Leu Glu Gly Asn Thr Ala Leu Ile Ser Gln Tyr Tyr
625 630 635 640
Tyr Gly Cys Ile Phe His Glu Leu Leu Ala Phe Gln Leu Ala Asp Arg
645 650 655
His Ala Pro Ala Lys Arg Asn Cys Glu Asn Val Lys Ser Val Asp Met
660 665 670
Ile Gly Phe Ala Arg Ser Ala Thr Ser Val Leu Ser Asn Ala Glu Leu
675 680 685
Ser Ile Asp Gly Val Glu Asn Glu Ser Leu Ile His Met Asp Val Asp
690 695 700
Gln Ile Phe Leu Pro Val Pro Ser Pro Val Lys Ala Ala Ile Phe Glu
705 710 715 720
Ser Phe Ala Arg Gln Asn Met Ser Glu Ser Glu Thr Asp Val Thr Ala
725 730 735
Ser Ile Lys Gly Phe Val Lys Ser Asn Tyr Gly Phe Pro Thr Asp Ser
740 745 750
Ser Thr Glu Phe Ile Tyr Ala Asp Asn Ser Lys Ala Leu Phe Asn Lys
755 760 765
Leu Val Leu Cys Cys Ile Lys Glu Gly Gly Thr Leu Cys Phe Pro Ala
770 775 780
Gly Ser Asn Gly Asn Tyr Val Ser Ser Ala Arg Phe Leu Lys Ala Asp
785 790 795 800
Ile Val Thr Val Pro Thr Asp Val Asn Val Gly Phe Lys Phe Thr Glu
805 810 815
Lys Thr Leu Thr Gly Ile Leu Gly Thr Val Lys Asn Pro Trp Val Tyr
820 825 830
Ile Ser Gly Pro Thr Val Asn Pro Thr Gly Leu Ile Tyr Ser Asn Asn
835 840 845
Glu Met Val Glu Ile Leu Ser Thr Cys Ala Arg Phe Gly Ala Arg Val
850 855 860
Ile Ile Asp Thr Ala Ser Ser Gly Leu Glu Phe Asp Cys Glu Gly Trp
865 870 875 880
Gly Gly Trp Asp Ile Glu Gly Cys Leu Ser Lys Leu Asn Ser Ser Ile
885 890 895
Lys Pro Ser Phe Cys Val Ser Leu Leu Gly Gly Leu Ser Leu Lys Met
900 905 910
Leu Asn Gly Val Leu Arg Phe Gly Phe Leu Ile Leu Asn Gln Pro Ile
915 920 925
Leu Val Asp Thr Phe Tyr Ser Tyr Pro Gly Leu Ser Lys Pro His Thr
930 935 940
Thr Ala Arg Tyr Ala Thr Lys Lys Leu Leu Glu Arg Arg Glu Gln Lys
945 950 955 960
Pro Ser Ser Leu Ser Asp Ala Ile Val Glu His Thr Gln Ile Leu Lys
965 970 975
Thr Arg Ser Lys Cys Leu Lys Glu Val Leu Gln Lys Ser Gly Trp Asp
980 985 990
Val Leu Glu Ser Cys Ala Gly Val Ser Val Val Ala Lys Pro Ser Ala
995 1000 1005
Tyr Leu Asn Lys Thr Ile Lys Leu Lys Ile Ser Leu Glu Gly Glu Ala
1010 1015 1020
Ser His Gly Ser Ala Thr Lys Glu Ile Lys Leu Asp Asp Ser Asn Ile
1025 1030 1035 1040
Arg Thr Val Ile Leu Lys Ala Thr Gly Leu Cys Ile Asn Ser Gly Ser
1045 1050 1055
Trp Thr Gly Ile Pro Gly Tyr Cys Arg Phe Asn Ile Ala Leu Glu Glu
1060 1065 1070
Asn Asp Phe Lys Lys Ala Leu Asp Cys Ile Leu Lys Phe Lys Glu Val
1075 1080 1085
Ala Leu Gly
1090
Claims (6)
1.一种提高甲硫氨酸产量的方法,其特征在于所述方法为:将胱硫醚-γ-合酶基因、同型半胱氨酸甲基转移酶基因或甲硫氨酸甲基转移酶基因中的一种或多种导入宿主菌构建重组基因工程菌,将重组基因工程菌发酵培养,获得含甲硫氨酸发酵液,发酵液分离纯化获得甲硫氨酸;所述胱硫醚-γ-合酶基因核苷酸序列为SEQ ID No.1所示;所述同型半胱氨酸甲基转移酶基因核苷酸序列为SEQ ID No.3所示;所述甲硫氨酸甲基转移酶基因核苷酸序列为SEQ ID No.5所示。
2.如权利要求1所述提高甲硫氨酸产量的方法,其特征在于所述宿主菌为大肠杆菌E.coliBL21(DE3)。
3.如权利要求1所述提高甲硫氨酸产量的方法,其特征在于所述重组基因工程菌按如下方法之一构建:(1)单酶体系:将胱硫醚-γ-合酶编码基因、同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因分别插入到质粒pBlunt-E1上得到重组质粒pBlunt-E1-CGS、pBlunt-E1-HMT和pBlunt-E1-MMT;将重组质粒分别导入大肠杆菌E.coli BL21(DE3)中,获得相应的工程菌E.coli BL21(DE3)pBlunt-E1-CGS、E.coli BL21(DE3)pBlunt-E1-HMT、E.coli BL21(DE3)pBlunt-E1-MMT;(2)双酶体系:同时将同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因串联插入到质粒pBlunt-E1上,重组质粒pBlunt-E1-HMT-MMT;将重组质粒导入大肠杆菌E.coli BL21(DE3)中,获得重组基因工程菌E.coli BL21(DE3)pBlunt-E1-HMT-MMT;(3)三酶体系:将胱硫醚-γ-合酶基因、同型半胱氨酸甲基转移酶基因和甲硫氨酸甲基转移酶基因串联插入质粒pBlunt-E1上,获得重组质粒pBlunt-E1-CGS-HMT-MMT,将重组质粒分别导入大肠杆菌中获得重组基因工程菌E.coli BL21(DE3)pBlunt-E1-CGS-HMT-MMT。
4.如权利要求1所述提高甲硫氨酸产量的方法,其特征在于所述重组基因工程菌为共表达胱硫醚-γ-合酶和同型半胱氨酸甲基转移酶以及甲硫氨酸甲基转移酶的重组基因工程菌。
5.如权利要求1所述提高甲硫氨酸产量的方法,其特征在于所述重组基因工程菌发酵培养方法为:将工程菌接种至发酵培养基中,在28℃、180rpm条件下进行发酵培养,获得含甲硫氨酸的发酵液,发酵液离心,分离纯化获得甲硫氨酸;所述发酵培养基终浓度组成为:葡萄糖20g/L,NaS2O3 16g/L,酵母粉2g/L,KH2PO4 1g/L,MgSO4 1g/L,CaCO3 10g/L,FeSO40.01g/L,MnSO4 0.01g/L,ZnSO40.01g/L,溶剂为水,pH自然。
6.如权利要求1所述提高甲硫氨酸产量的方法,其特征在于所述重组基因工程菌发酵前先进行诱导培养,具体如下:将重组基因工程菌接种于含有终浓度100μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养过夜,取培养物以体积浓度1-2%的接种量转接于含有100μg/mL氨苄霉素的LB液体培养基中,在37℃和200rpm条件下培养至OD600为0.6~0.8,向培养物中加入终浓度0.5mM的IPTG,在25℃,140rpm下诱导培养14h,然后于4℃和5000rpm离心收集湿菌体,并用发酵培养基重悬湿菌体洗涤2次,将湿菌体以1g/50ml的量接种至发酵培养基进行发酵。
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