CN106834389A - 一种重组菌催化莱鲍迪甙a制备莱鲍迪甙m2的方法 - Google Patents
一种重组菌催化莱鲍迪甙a制备莱鲍迪甙m2的方法 Download PDFInfo
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- CN106834389A CN106834389A CN201611142851.5A CN201611142851A CN106834389A CN 106834389 A CN106834389 A CN 106834389A CN 201611142851 A CN201611142851 A CN 201611142851A CN 106834389 A CN106834389 A CN 106834389A
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Abstract
本发明公开了一株重组菌及其在催化莱鲍迪甙A生成莱鲍迪甙M2中的应用,所述重组菌中同时含有番茄来源糖基转移酶UGTSL2基因和马铃薯来源蔗糖合酶StSUS1基因,将番茄来源糖基转移酶UGTSL2基因克隆到pRSFDuet‑1的NdeI与XhoI位点之间,构建得到重组质粒pRSFDuet‑SL2,然后再将马铃薯来源蔗糖合酶StSUS1基因克隆到pRSFDuet‑SL2的NcoI和EcoRI位点之间,构建得到重组质粒pRSFDuet‑SL2‑SUS1,将重组质粒pRSFDuet‑SL2‑SUS1转化到宿主细胞中,得到重组菌。将重组菌诱导表达后取粗酶液,加入到反应混合物中催化莱鲍迪甙A生成莱鲍迪甙M2,反应中使用重组菌破碎后的粗酶液,避免了酶的分离纯化,也无需制作冻干粉,反应液中不需添加直接底物莱鲍迪甙D及UDP或UDP‑葡萄糖和任何细胞通透剂或其他化学试剂,环境友好性更佳。莱鲍迪甙M2的产率高达11.09g/L。
Description
技术领域
本发明属于基因工程技术领域,具体涉及一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法。
背景技术
甜菊糖提取自原产于南美巴拉圭和巴西的多年生菊科草本植物甜叶菊,具有高甜度(为蔗糖的250~300倍)、低热量(仅为蔗糖的1/300)的特性,食用安全,有一定的药理作用和辅助疗效。它是继甘蔗糖、甜菜糖之外的第三种有开发价值和健康推崇的天然蔗糖替代品,被国际上誉为“世界第三糖源”。1998年,美国食品和药物管理局(FDA)同意将甜菊糖添加到食品饮料中。瑞士将甜菊糖列入本国药典作为糖浆剂、口服液或含片的主要甜味剂原料,取代了糖精钠等传统药用甜味剂。相对于日本、美国和瑞士,欧盟批准使用甜菊糖的时间稍晚一些。2008年欧盟正式批准其作为食品添加剂。
由于对甜菊糖的需求量不断增加,许多国家包括日本、新加坡、马来西亚、韩国、中国、以色列、印度、巴西和澳大利亚等都已在商业化种植甜叶菊。甜叶菊的叶子含有多种天然的甜味糖甙如甜菊甙、莱鲍迪A-F、杜尔可甙A和甜茶甙。2008年,美国FDA签发了确认莱鲍迪甙A能以最低95%的纯度用作零卡路里甜味剂的“通常认为是安全的”(“GRAS”)通知。2014年,莱鲍迪甙M也获得了FDA “GRAS”认证。莱鲍迪甙M与莱鲍迪甙A结构相似,只相差两个葡萄糖基,与莱鲍迪甙A相比更具口感优势。莱鲍迪甙M不是甜菊糖总甙中的主要糖甙,但目前已有化学合成(专利201410314371.7和201410553617.6)和生物制备方法(专利201310353500.9和CN201410019981.4)可用于生产莱鲍迪甙M。莱鲍迪甙M2是莱鲍迪甙M的同分异构体,两者结构式如下式所示:
莱鲍迪甙M 莱鲍迪甙M2
莱鲍迪甙M2具有潜在的经济价值。番茄来源的UDP-糖基转移酶UGTSL2能催化莱鲍迪甙A糖基化生成莱鲍迪甙D和莱鲍迪甙M2(US2014/0357588A1,Biomolecules 2014,4:374-389),莱鲍迪甙D和莱鲍迪甙M2分别占23.7%和6%。其中莱鲍迪甙M2含量低,难以实现大量制备和工业化。
此外,已报道的莱鲍迪甙M的生物制备方法(专利CN201310353500.9和CN201410019981.4),使用重组细胞作为催化剂,需要添加甲苯或其它细胞通透剂;或使用重组细胞冻干粉作为催化剂,而冻干粉的制备耗能、成本高;并且需要额外添加UDP作为UDP-葡萄糖再生体系的辅底物;或需要调配UDP-糖基转移酶和蔗糖合酶的添加比例,重组菌用量大,产酶成本高。
发明内容
为了解决上述问题,本发明提供一种重组菌及其在催化莱鲍迪甙A生成莱鲍迪甙M2中的应用,构建的重组菌可以共表达番茄来源的UDP-糖基转移酶UGTSL2和马铃薯来源的蔗糖合酶StSUS1,不需要分开表达和制备、也不需要调节两种酶之间的配比,应用于合成莱鲍迪甙M2过程中直接使用重组菌破碎后的粗酶液,不需添加UDP或UDP-葡萄糖,也不需要使用直接底物莱鲍迪甙D,以及细胞通透剂或其他化学试剂,简化了工艺过程,收率高。
为了实现上述目的,本发明采用的技术方案为:
一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,将重组菌诱导表达后取粗酶液,加入到反应混合物中催化莱鲍迪甙A生成莱鲍迪甙M2,所述反应混合物中包括莱鲍迪甙A、蔗糖和磷酸钠缓冲液;所述重组菌中同时含有番茄来源糖基转移酶UGTSL2基因和马铃薯来源蔗糖合酶StSUS1基因。
所述重组菌中同时含有番茄来源糖基转移酶UGTSL2基因和马铃薯来源蔗糖合酶StSUS1基因,所述番茄来源糖基转移酶UGTSL2基因序列如SEQ.NO.1所示,其编码的番茄来源糖基转移酶UGTSL2的氨基酸序列如SEQ.NO.3所示,所述马铃薯来源蔗糖合酶StSUS1基因序列如SEQ.NO.2所示,其编码的马铃薯来源蔗糖合酶StSUS1氨基酸序列如SEQ.NO.4所示。
将番茄来源糖基转移酶UGTSL2基因克隆到pRSFDuet-1的NdeI与XhoI位点之间,构建得到重组质粒pRSFDuet-SL2,然后再将马铃薯来源蔗糖合酶StSUS1基因克隆到pRSFDuet-SL2的NcoI和EcoRI位点之间,构建得到重组质粒pRSFDuet-SL2-SUS1,将重组质粒pRSFDuet-SL2-SUS1转化到宿主细胞中,得到重组菌。
所述的重组菌在催化莱鲍迪甙A生成莱鲍迪甙M2中的应用。
将重组菌诱导表达后取粗酶液,加入到反应混合物中催化莱鲍迪甙A生成莱鲍迪甙M2,所述反应混合物中包括莱鲍迪甙A、蔗糖和磷酸钠缓冲液。
所述重组菌的诱导表达条件为:将重组菌接种到LB培养基中,于20~37℃、250rpm振荡培养8h,再将培养菌液按2%接种量接入诱导培养基中,于200rpm, 20~37℃培养2h,待OD600达到0.2左右时转20℃~37℃诱导培养22h,离心收集菌体。所述诱导培养基中诱导剂浓度为0.1~0.9g/L。进一步的优选诱导温度为25℃,诱导剂浓度为0.5g/L。
所述反应混合物中莱鲍迪甙A10g/L,蔗糖浓度为30g/L,粗酶液浓度为2~10g/L,采用磷酸钠缓冲液调节pH为7.2;进一步优选地,粗酶液浓度为8g/L。
所述反应温度为20℃~40℃,反应时间为2~36 h。进一步优选,反应温度为40℃,反应时间为25h。
所述LB培养基配方为0.5g/L酵母粉、0.5g/L氯化钠、1g/L胰蛋白胨、0.05g/L卡纳霉素。
所述诱导培养基配方为25g/L酵母粉、15g/L胰蛋白胨、10g/L氯化钠、2g/L葡萄糖、0.05~0.9g/L乳糖,0.05g/L卡纳霉素。诱导培养基中优选乳糖浓度为0.5g/L。
通过控制反应条件,在40℃,pH7.2,酶浓度为8mg/mL、反应时间25h时,莱鲍迪甙M2摩尔收率达到83%。
有益效果:本发明构建的共表达番茄来源UDP-糖基转移酶UGTSL2和马铃薯来源蔗糖合酶StSUS1的重组菌作为生物催化剂,不需要分开表达和制备UDP-糖基转移酶与蔗糖合酶,也不需要调节两种酶之间的配比。重组菌可以在-20℃或-80℃保存,反应中使用重组菌破碎后的粗酶液,避免了酶的分离纯化,也无需制作冻干粉,简化了工艺过程。在催化莱鲍迪甙A生成莱鲍迪甙M2过程中,反应液中不需添加莱鲍迪甙D,UDP或UDP-葡萄糖,显著降低成本。反应液中不需添加任何细胞通透剂或其他化学试剂,环境友好性更佳。莱鲍迪甙M2的产率高达11.09g/L。
附图说明
图1:反应液样品HPLC检测结果图, 反应中包含10g/L 莱鲍迪甙A,30g/L蔗糖,3mM氯化镁,8mg/mL粗酶液。磷酸钠缓冲pH7.2,总体系为10mL,40℃条件下反应25h的样品;
图2:样品中莱鲍迪甙M2的质谱图。
具体实施方式
以下实施例中,莱鲍迪甙M2采用液相色谱检测,HPLC在安捷伦AgilentTechnologies 1290 Infinity 液相色谱仪上进行,色谱分析条件如下:
色谱柱:Agilent5TC-C18(Netheriands)250×4.6mm;流动相为0.1%甲酸:乙腈(70:30;V:V);流速1min/mL;柱温55℃;检测波长:210nm。
高效液相质谱检测在二元梯度超高效液相色谱质谱(WATERS I-CLASS)上进行,色谱柱采用AXQUITY UPLC ®HSS T3 1.8μm, 2.1*100 ㎜;高效液相分析条件同前。质谱检测参数设置: 喷雾电压3.0kV,锥孔电压40V,脱溶剂气流量800L/h,气帘气流量50 L/h,低端分辨率11.3,高端分辨率14.0,离子能量-0.3。
实施例1 重组菌株的构建
番茄来源糖基转移酶UGTSL2的基因序列如SEQ.NO.1所示,马铃薯来源蔗糖合酶StSUS1基因序列如SEQ.NO.2所示经密码子优化后由南京金斯瑞公司合成。设计引物GGGAATTCCATATGGCGACCAACCTGCG和CCGCTCGAGTTAGTGGTGATGATGGTGATGTTTG扩增UGTSL2基因,将该基因亚克隆到pRSFDuet-1(Novagen)的NdeI与XhoI位点之间,构建重组质粒pRSFDuet-SL2;设计引物TAATAAGGAGATATACCATGGCCGAACGTGTCCTGACCC和AGGCGCGCCGAGCTCGAATTCTTATTCAGCTGCCAGCG,用南京诺唯赞生物科技有限公司的一步克隆试剂盒(One Step Cloning Kit,Vazyme)将StSUS1基因亚克隆到pRSFDuet-SL2的NcoI和EcoRI位点之间,构建重组质粒pRSFDuet-SL2-SUS1。分子克隆操作中TransFastTaqDNA聚合酶购自北京全式金生物技术有限公司,T4 DNA连接酶及限制性内酶均购自大连TaKaRa公司。
实施例2 诱导表达重组酶及粗酶液制备
将实施例1中构建的pRSFDuet-SL2-SUS1转化到大肠杆菌BL21(DE3),获得重组菌BL21(pRSFDuet-SL2-SUS1)。将该重组菌菌株接种到含有0.05g/L卡纳霉素的5mL LB培养基(0.5g/L酵母粉,0.5g/L氯化钠,1g/L胰蛋白胨),于37℃、250rpm振荡培养8h,再将培养菌液按2%接种量接入含有100mL诱导培养基(25g/L酵母粉,15g/L胰蛋白胨,10g/L氯化钠,2g/L葡萄糖,0.05g/L乳糖)的500mL摇瓶中,于200rpm, 30℃培养2h,待OD600达到0.2左右时转25℃诱导22h离心收集菌体。超声破菌,离心取上清液为粗酶液,置于4℃冰箱待用。
实施例3 温度对重组菌株的诱导表达的影响
将重组菌接种到含有0.05g/L卡纳霉素的5mL LB培养基(0.5g/L酵母粉,0.5g/L氯化钠,1g/L胰蛋白胨),37℃条件下、250rpm振荡培养8h,再将培养菌液按2%接种量接入含有100mL诱导培养基(25g/L酵母粉,15g/L胰蛋白胨,10g/L氯化钠,2g/L葡萄糖,0.05g/L乳糖)的500mL摇瓶中,于200rpm,分别在30℃条件下培养2h,待OD600达到0.2左右时,分别在20℃,25℃,30℃,37℃诱导22h离心收集菌体,超声破菌,离心取上清液为粗酶液,置于4℃冰箱待用。
分别取不同诱导温度下获取的粗酶液,在温度30℃,pH7.2,莱鲍迪甙A 10g/L,蔗糖30g/L,8mg/mL粗酶液的条件下反应25h,莱鲍迪甙M2产量见表1。
表1
温度(℃) | 莱鲍迪甙M2(g/L) |
20 | 5.97 |
25 | 8.96 |
30 | 0.50 |
37 | 0 |
在25℃条件下诱导产酶,其粗酶液合成莱鲍迪甙M2产量最高,为8.96 g/L。
实施例4 乳糖浓度对重组菌株的诱导表达的影响
将重组菌S4接种到含有0.05g/L卡纳霉素的5mL LB培养基(0.5g/L酵母粉,0.5g/L氯化钠,1g/L胰蛋白胨),37℃条件下、250rpm振荡培养8h,再将培养菌液按2%接种量接入含有不同乳糖浓度的100mL诱导培养基(25g/L酵母粉,15g/L胰蛋白胨,10g/L氯化钠,2g/L葡萄糖,分别为0.1g/L、0.3g/L、0.5g/L、0.7g/L、0.9g/L的乳糖浓度)的500mL摇瓶中,于200rpm,分别在30℃条件下培养2h,待OD600达到0.2左右时,分别在20℃诱导22h离心收集菌体,超声破菌,离心取上清液为粗酶液,置于4℃冰箱待用。
分别取不同乳糖浓度诱导下获取的粗酶液,在温度30℃,pH7.2,莱鲍迪甙A 10g/L,蔗糖30g/L,8mg/mL粗酶液的条件下反应25h,莱鲍迪甙M2产量见表2。
表2
乳糖浓度(g/L) | 莱鲍迪甙M2(g/L) |
0.1 | 4.86 |
0.3 | 3.13 |
0.5 | 8.93 |
0.7 | 4.41 |
0.9 | 5.91 |
在乳糖浓度为0.5g/L条件下诱导产酶,其粗酶液合成莱鲍迪甙M2产量最高,为8.93 g/L。
由实施例3和4可以得到重组菌株的最佳诱导条件为:诱导温度25℃,诱导剂乳糖浓度为0.5g/L。
实施案例5 粗酶液浓度对重组菌株催化的影响
重组菌株诱导表达后获取的粗酶液进行反应。在50mL三角瓶中,10mL反应混合物中包含10g/L莱鲍迪甙A,50g/L蔗糖,pH 7.2的50mM磷酸钠缓冲,粗酶液蛋白浓度分别为2、4、6、8和10 mg/mL,反应在30℃、200rpm条件下进行。加入粗酶液启动反应,反应14h后取样于95℃加热5min灭活酶,离心取上清,测得不同粗酶液浓度下反应液中莱鲍迪甙M2的含量,结果见表3。
表3:
酶浓度(mg/mL) | 莱鲍迪甙M2(g/L) |
2 | 0 |
4 | 0.23 |
6 | 1.83 |
8 | 4.89 |
10 | 5.05 |
当粗酶液蛋白浓度为10 mg/mL时反应液中莱鲍迪甙M2产量最高,为5.05g/L。而当粗酶液蛋白浓度为8 mg/mL时反应液中莱鲍迪甙M2已达到4.89 g/L,两者产量接近。
实施例6
采用重组菌S4诱导表达后获取的粗酶液进行反应,在50mL三角瓶中,10mL反应混合物中包含10g/L莱鲍迪甙A,50g/L蔗糖,pH 7.2的50mM磷酸钠缓冲,8mg/mL粗酶液,反应在30℃和200rpm条件下进行。加入粗酶液启动反应,分别在反应2、6、10、14、18、25、29和32 h后取样于95℃加热5min灭活酶,离心取上清,测得不同时间反应液中莱鲍迪甙M2的含量,结果见表4。
表4
时间(h) | 莱鲍迪甙M2 (g/L) |
2 | 0.06 |
6 | 0.61 |
10 | 3.48 |
14 | 4.77 |
18 | 5.29 |
25 | 6.70 |
29 | 6.93 |
32 | 6.92 |
在29 h反应液中莱鲍迪甙M2产量最高,这时反应液中莱鲍迪甙M2的浓度为6.93 g/L。但25 h已经达到了6.70 g/L,可见25h后,反应进行缓慢,产物积累很少。
实施例7
重组菌株诱导表达后获取的粗酶液进行反应。在50mL三角瓶中,10mL反应混合物中包含10g/L莱鲍迪甙A,50g/L蔗糖,pH 7.2的50mM磷酸钠缓冲,3mg/mL粗酶液,反应分别在20、25、30、37、40℃和200rpm条件下进行。加入粗酶液启动反应,反应25h后取样于95℃加热5min灭活酶,离心取上清,测得不同反应温度下反应液中莱鲍迪甙M2的含量,结果见表5。
表5
温度(℃) | 莱鲍迪甙M2 (g/L) |
20 | 2.84 |
25 | 4.17 |
30 | 5.62 |
37 | 7.74 |
40 | 11.09 |
可见在40℃条件下反应液中莱鲍迪甙M2产量最高,这时反应液中莱鲍迪甙M2的浓度为11.09g/L。在40℃条件下反应时莱鲍迪甙A可全部反应完全。
由实施例5-7可知,最佳反应条件为:
重组菌株诱导表达后获取的粗酶液进行反应。在50mL三角瓶中,10mL反应混合物中包含10g/L莱鲍迪甙A,30g/L蔗糖,pH 7.2的50mM磷酸钠缓冲,粗酶液蛋白浓度8 mg/mL,反应在40℃、200rpm条件下进行。加入粗酶液启动反应,反应25h后取样于95℃加热5min灭活酶,离心取上清,反应液中莱鲍迪甙M2产量最高,为11.09g/L,产率为83%。
SEQUENCE LISTING
<110> 南京工业大学
<120> 一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法
<130>
<160> 8
<170> PatentIn version 3.3
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cgtattaacc tggagagcat cattaagaaa atcccggaaa agtatgcgga cagcatccac 180
ctgattgagc tgcaactgcc ggagctgccg gaactgccgc cgcactatca caccaccaac 240
ggtctgccgc cgcacctgaa cccgaccctg cacaaggcgc tgaaaatgag caagccgaac 300
tttagccgta tcctgcagaa cctgaaaccg gatctgctga tttacgacgt gctgcagccg 360
tgggcggagc acgttgcgaa cgaacaaaac attccggcgg gtaaactgct gaccagctgc 420
gcggcggtgt tcagctattt ctttagcttt cgtaagaacc cgggcgttga gttcccgttt 480
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ccggaggaag gtggccgtct ggatgagggt aacaagcaga tgatgctgat gtgcaccagc 600
cgtaccatcg aggcgaaata cattgactat tgcaccgaac tgtgcaactg gaaggtggtt 660
ccggtgggtc cgccgttcca agatctgatc accaacgatg cggacaacaa agagctgatt 720
gactggctgg gtaccaagca cgaaaacagc accgtgttcg ttagctttgg cagcgagtac 780
ttcctgagca aagaagatat ggaggaagtt gcgtttgcgc tggagctgag caacgtgaac 840
ttcatctggg ttgcgcgttt tccgaaaggc gaggaacgta acctggaaga tgcgctgccg 900
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agcaatacgc tgcaaaatgt gctgcgcaaa gcggaagaat acctgatcat gctgccgccg 660
gaaaccccgt acttcgaatt tgaacataaa ttccaggaaa ttggcctgga aaaaggctgg 720
ggtgatacgg cagaacgtgt gctggaaatg gtttgcatgc tgctggatct gctggaagct 780
ccggacagct gtaccctgga aaaatttctg ggtcgcattc cgatggtttt caacgtcgtg 840
atcctgtctc cgcacggcta ttttgcgcag gaaaatgtcc tgggttaccc ggataccggc 900
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atcaaagaac agggcctgga tattatcccg cgtattctga tcgtcacccg tctgctgccg 1020
gacgcagtgg gcaccacgtg cggtcaacgt attgaaaaag tgtatggcgc tgaacattca 1080
cacatcctgc gtgttccgtt tcgcaccgaa aaaggtattg tccgtaaatg gatctcgcgc 1140
tttgaagtgt ggccgtacat ggaaacgttc attgaagatg ttgcaaaaga aatctcagcg 1200
gaactgcagg ccaaaccgga cctgattatc ggcaactata gcgaaggtaa tctggcggcc 1260
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ttccaggaaa tcgcgggctc caaagatacc gtgggtcaat acgaaagtca tatggccttt 1500
acgatgccgg gcctgtatcg cgtggttcac ggtatcaacg ttttcgatcc gaaattcaac 1560
attgtctccc cgggtgcaga catcaatctg tatttttcat actcggaaac cgaaaaacgt 1620
ctgacggctt tccatccgga aatcgatgaa ctgctgtata gcgatgtgga aaacgacgaa 1680
cacctgtgcg ttctgaaaga tcgcaccaaa ccgattctgt ttacgatggc gcgtctggac 1740
cgcgttaaaa atctgaccgg cctggtcgaa tggtacgcca aaaacccgcg tctgcgcggt 1800
ctggtgaatc tggtcgtggt tggcggtgat cgtcgcaaag aatctaaaga cctggaagaa 1860
caggcggaaa tgaagaaaat gtacgaactg atcgaaaccc ataacctgaa tggccagttc 1920
cgttggatca gttcccaaat gaaccgtgtt cgcaatggcg aactgtatcg ctacatcgca 1980
gatacgaaag gtgcttttgt ccagccggcg ttttacgaag ccttcggcct gaccgtcgtg 2040
gaagcgatga cgtgcggtct gccgaccttc gcaacgaatc atggcggccc ggcagaaatt 2100
atcgttcacg gcaaaagtgg ttttcatatt gatccgtatc acggcgaaca ggcagctgat 2160
ctgctggccg actttttcga aaaatgtaaa aaagacccgt cacattggga aaccatttcg 2220
atgggcggtc tgaaacgcat cgaagaaaaa tatacctggc aaatttacag cgaatctctg 2280
ctgacgctgg cggccgtgta cggtttctgg aaacacgttt ctaaactgga tcgtctggaa 2340
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Phe Gln Glu Ile Ala Gly Ser Lys Asp Thr Val Gly Gln Tyr Glu Ser
485 490 495
His Met Ala Phe Thr Met Pro Gly Leu Tyr Arg Val Val His Gly Ile
500 505 510
Asn Val Phe Asp Pro Lys Phe Asn Ile Val Ser Pro Gly Ala Asp Ile
515 520 525
Asn Leu Tyr Phe Ser Tyr Ser Glu Thr Glu Lys Arg Leu Thr Ala Phe
530 535 540
His Pro Glu Ile Asp Glu Leu Leu Tyr Ser Asp Val Glu Asn Asp Glu
545 550 555 560
His Leu Cys Val Leu Lys Asp Arg Thr Lys Pro Ile Leu Phe Thr Met
565 570 575
Ala Arg Leu Asp Arg Val Lys Asn Leu Thr Gly Leu Val Glu Trp Tyr
580 585 590
Ala Lys Asn Pro Arg Leu Arg Gly Leu Val Asn Leu Val Val Val Gly
595 600 605
Gly Asp Arg Arg Lys Glu Ser Lys Asp Leu Glu Glu Gln Ala Glu Met
610 615 620
Lys Lys Met Tyr Glu Leu Ile Glu Thr His Asn Leu Asn Gly Gln Phe
625 630 635 640
Arg Trp Ile Ser Ser Gln Met Asn Arg Val Arg Asn Gly Glu Leu Tyr
645 650 655
Arg Tyr Ile Ala Asp Thr Lys Gly Ala Phe Val Gln Pro Ala Phe Tyr
660 665 670
Glu Ala Phe Gly Leu Thr Val Val Glu Ala Met Thr Cys Gly Leu Pro
675 680 685
Thr Phe Ala Thr Asn His Gly Gly Pro Ala Glu Ile Ile Val His Gly
690 695 700
Lys Ser Gly Phe His Ile Asp Pro Tyr His Gly Glu Gln Ala Ala Asp
705 710 715 720
Leu Leu Ala Asp Phe Phe Glu Lys Cys Lys Lys Asp Pro Ser His Trp
725 730 735
Glu Thr Ile Ser Met Gly Gly Leu Lys Arg Ile Glu Glu Lys Tyr Thr
740 745 750
Trp Gln Ile Tyr Ser Glu Ser Leu Leu Thr Leu Ala Ala Val Tyr Gly
755 760 765
Phe Trp Lys His Val Ser Lys Leu Asp Arg Leu Glu Ile Arg Arg Tyr
770 775 780
Leu Glu Met Phe Tyr Ala Leu Lys Tyr Arg Lys Met Ala Glu Ala Val
785 790 795 800
Pro Leu Ala Ala Glu
805
<210> 5
<211> 28
<212> DNA
<213> 人工序列
<400> 5
gggaattcca tatggcgacc aacctgcg 28
<210> 6
<211> 34
<212> DNA
<213> 人工序列
<400> 6
ccgctcgagt tagtggtgat gatggtgatg tttg 34
<210> 7
<211> 39
<212> DNA
<213> 人工序列
<400> 7
taataaggag atataccatg gccgaacgtg tcctgaccc 39
<210> 8
<211> 38
<212> DNA
<213> 人工序列
<400> 8
aggcgcgccg agctcgaatt cttattcagc tgccagcg 38
Claims (9)
1.一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,将重组菌诱导表达后取粗酶液,加入到反应混合物中催化莱鲍迪甙A生成莱鲍迪甙M2,所述反应混合物中包括莱鲍迪甙A、蔗糖和磷酸钠缓冲液;所述重组菌中同时含有番茄来源糖基转移酶UGTSL2基因和马铃薯来源蔗糖合酶StSUS1基因。
2.根据权利要求1所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述番茄来源糖基转移酶UGTSL2基因序列如SEQ.NO.1所示,所述马铃薯来源蔗糖合酶StSUS1基因序列如SEQ.NO.2所示。
3.根据权利要求1所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述反应混合物中莱鲍迪甙A浓度为4~10g/L,蔗糖浓度为30~50g/L,粗酶液浓度为2~10g/L,采用磷酸钠缓冲液调节pH为6.4~8。
4.根据权利要求1所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述反应温度为20℃~40℃,反应时间为2~36h。
5.根据权利要求1所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述重组菌的诱导表达条件为:将重组菌接种到LB培养基中,于20~37℃、250rpm振荡培养8h,再将培养菌液按2%接种量接入诱导培养基中,于200rpm, 20~37℃培养2h,待OD600达到0.2左右时转20℃~37℃诱导培养22h,离心收集菌体。
6.根据权利要求2所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述重组菌是将番茄来源糖基转移酶UGTSL2基因克隆到pRSFDuet-1的NdeI与XhoI位点之间,构建得到重组质粒pRSFDuet-SL2,然后再将马铃薯来源蔗糖合酶StSUS1基因克隆到pRSFDuet-SL2的NcoI和EcoRI位点之间,构建得到重组质粒pRSFDuet-SL2-SUS1,将重组质粒pRSFDuet-SL2-SUS1转化到宿主细胞中,得到的重组菌。
7.根据权利要求3所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述反应混合物中莱鲍迪甙A浓度为10g/L,蔗糖浓度为30g/L,粗酶液浓度为8g/L,采用磷酸钠缓冲液调节pH为7.2。
8.根据权利要求5所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述LB培养基配方为0.5g/L酵母粉、0.5g/L氯化钠、1g/L胰蛋白胨、0.05g/L卡纳霉素。
9.根据权利要求5所述的一种重组菌催化莱鲍迪甙A制备莱鲍迪甙M2的方法,其特征在于,所述诱导培养基配方为25g/L酵母粉、15g/L胰蛋白胨、10g/L氯化钠、2g/L葡萄糖、0.05~0.9g/L乳糖、0.05g/L卡纳霉素。
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