CN111500601B - 杨梅黄酮醇3-o-鼠李糖基转移酶基因及编码蛋白和应用 - Google Patents
杨梅黄酮醇3-o-鼠李糖基转移酶基因及编码蛋白和应用 Download PDFInfo
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- CN111500601B CN111500601B CN202010222996.6A CN202010222996A CN111500601B CN 111500601 B CN111500601 B CN 111500601B CN 202010222996 A CN202010222996 A CN 202010222996A CN 111500601 B CN111500601 B CN 111500601B
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- myricetin
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Abstract
本发明公开一种黄酮醇3‑O‑鼠李糖基转移酶基因及编码蛋白和应用,该基因从杨梅果实中分离获得,其核苷酸序列如SEQ:NO.1所示,其编码蛋白的氨基酸序列如SEQ:NO.2所示。本发明首次克隆并验证了杨梅黄酮醇3‑O‑鼠李糖苷合成相关的MrUGT78D1基因的功能。本发明通过构建重组质粒,实现了MrUGT78D1基因在大肠杆菌中的重组表达,提供转基因工程菌。所述的黄酮醇3‑O‑鼠李糖基转移酶基因及其编码蛋白在生物合成黄酮醇3‑O‑鼠李糖苷中的应用。本发明可应用于基于基因工程的植物基因组改造,定向改良植物黄酮醇组分,增加食物的保健功能;也可应用于基于代谢工程的黄酮醇鼠李糖苷工业化生产。
Description
技术领域
本发明属于植物分子生物技术和基因工程领域,涉及一种参与杨梅黄酮醇3-O-鼠李糖苷生物合成的基因,尤其涉及杨梅黄酮醇3-O-鼠李糖基转移酶基因及其编码蛋白和应用。
背景技术
杨梅(Morella rubra)是杨梅科杨梅属亚热带果树,原产中国,记载的人工栽培历史2000多年。杨梅果实风味浓郁,营养丰富,深受人们喜爱。《本草纲目》记载,杨梅有“生津止渴,调五脏,涤肠胃,除烦愦恶气”的功效;现代研究也报道了杨梅抗氧化、抗炎和抗过敏、抗癌、止泻抑菌、抑制黑色素生成和抑制脂肪酶活性等不同生物活性。
杨梅富含黄酮醇化合物,其中杨梅素3-O-鼠李糖苷在杨梅叶片和果实中含量丰富。现代研究证明,杨梅素3-O-鼠李糖苷在降糖、改善心肌收缩、抑制癌细胞增殖等方面发挥重要作用。黄酮醇通常以糖苷形式存在于植物细胞的液泡中,黄酮醇糖基化在细胞质中由糖基转移酶(glycosyltransferase,GT,EC2.4.x.y)催化发生。糖基化是植物中广泛存在的化合物修饰方式,也是许多次生代谢产物合成反应的最后一步。糖基化可以改变黄酮醇化合物的亲水性,增加其溶解度和化学稳定性,影响其生物活性,有助于其在细胞内和生物体内的储存和转运。
杨梅中含有大量杨梅素3-O-鼠李糖苷,是决定杨梅生物学活性的重要组成成分。尿苷二磷酸糖依赖的糖基转移酶(UDP-glycosyltransferases,UGTs)是参与杨梅中黄酮醇3-O-鼠李糖苷合成的关键酶,因此鉴别相关基因,阐明杨梅黄酮醇糖苷生物合成途径具有重要意义。可应用于基于基因工程的植物基因组改造,定向改良黄酮醇组分,增加食物的保健功能;也可应用于基于代谢工程的黄酮醇糖苷工业化生产,对提高黄酮醇产量,提高药品生物安全性奠定基础。
发明内容
本发明的目的是提供一种杨梅黄酮醇3-O-鼠李糖基转移酶(MrUGT78D1)基因及其编码蛋白,是一种参与杨梅黄酮醇3-O-鼠李糖苷生物合成的基因,所述MrUGT78D1基因的核苷酸序列如SEQ:NO.1所示,编码序列全长为1455个核苷酸,其氨基酸序列如SEQ:NO.2所示,可编码一个含484个氨基酸的蛋白。
本发明提供的一种黄酮醇3-O-鼠李糖基转移酶(MrUGT78D1)基因,是从杨梅果实中分离获得,为一种尿苷二磷酸鼠李糖(UDP-鼠李糖)依赖的黄酮醇3-O-鼠李糖基转移酶。
本发明的另一个目的是提供所述黄酮醇3-O-鼠李糖基转移酶(MrUGT78D1)基因及其编码蛋白在合成黄酮醇3-O-鼠李糖苷中的应用。将上述黄酮醇3-O-鼠李糖基转移酶MrUGT78D1基因连接到pET6xHN载体的多克隆位点中构建重组质粒,命名为pET6xHN-MrUGT78D1。通过在大肠杆菌中表达重组质粒pET6xHN-MrUGT78D1,得到MrUGT78D1重组蛋白,可利用UDP-鼠李糖苷作为糖基供体将黄酮醇转化成黄酮醇3-O-鼠李糖苷。
本发明提供了一种黄酮醇3-O-鼠李糖基转移酶MrUGT78D1基因及其编码蛋白和应用,首次克隆并验证了杨梅黄酮醇3-O-鼠李糖苷生物合成相关糖基转移酶MrUGT78D1基因的功能,在体外,MrUGT78D1重组蛋白可将杨梅素和槲皮素分别转化成杨梅素3-O-鼠李糖苷和槲皮素3-O-鼠李糖苷。本发明还提供了含有MrUGT78D1基因的重组质粒和转基因工程菌,可通过代谢工程方法大量合成黄酮醇3-O-鼠李糖苷。本发明提供了一种能大量合成黄酮醇3-O-鼠李糖苷的途径,为进一步开展黄酮醇糖苷生物合成调控研究奠定基础。
附图说明
图1:杨梅MrUGT78D1蛋白与其他植物UGT系统发育树分析。AtUGT78D1(AAF19756),AtUGT78D2(CAC01718),CcUGT77B2(MG938542),VvGT1(AAB81683),VvGT5(AB499074),VvGT6(AB499075),FaGT1(AAU09442),Ph3GT(BAA89008),Bronze1(AAK73112),PhF3GalT(AAD55985),CsUGT78A14(ALO19888),CsUGT78A15(KP682361),PpUGT78B(ONI25885),Cp3GT(ACS15351),Iris 5GT(BAD06874),Gt5GT7(BAG32255),Perilla 5GT(AB013596),Verbena5GT(AB013598),Ph5GT(AB027455),Torenia5GT(AB076698),Va5GT(AHL68667),AtUGT89C1(AAM13132),AtUGT73B2(AAK59668),AtUGT73C6(AEC09298),SbUBGT(BAA83484),FaGT6(DQ289587),FaGT7(DQ289588),LeABRT2(LC131336),LeABRT4(LC131337),Petunia 3RT(CAA50376),Cs16RhaT(ABA18631),Cm12RhaT(AY048882),GmF3G6Rt(BAN91401),Ip3GGT(BAD95881),AtUGT79B2(AEE85357),AtUGT79B3(AEE85358),AtUGT79B6(AED96438).
图2:MrUGT78D1氨基酸序列SEQ:NO.2与其他植物UDP-鼠李糖基转移酶氨基酸比对结果。
图3:杨梅MrUGT78D1重组蛋白的SDS-PAGE分析图。
图4:重组蛋白MrUGT78D1对杨梅素和槲皮素体外酶活性分析HPLC图谱。
图5:黄酮醇3-O-鼠李糖基转移酶MrUGT78D1催化模式图;以UDP-鼠李糖为糖基供体,杨梅素和槲皮素为糖基受体,经MrUGT78D1催化生成杨梅素3-O-鼠李糖苷和槲皮素3-O-鼠李糖苷。
具体实施方式
下面对本发明的实施例和附图作详细说明,本实施例在以本发明技术方案为前提下进行实施,给出了详细的实施方式和具体的操作过程,但本发明的保护范围不限于下述的实施例。实施例中未注明具体条件者,按照常规条件或制造商建议的条件进行。所用试剂或仪器未注明生产厂商者,均为可以通过市购获得的常规产品。
实施例1:杨梅RNA提取及MrUGT78D1基因克隆
一、实验方法
1、材料:以‘荸荠’杨梅果实为材料,设置三个生物学重复,每个重复4-6个果实,取果实果肉组织,迅速用液氮冻透,放至-80℃冰箱中保存。
2、利用CTAB法提取杨梅果肉的RNA,按照PrimeScriptTMRT reagent Kit withgDNA Eraser(Takara)试剂说明书操作合成cDNA。以反转录产物cDNA为模板,用SEQ:NO.3和SEQ:NO.4所示引物进行PCR扩增,PCR反应体系为50μL,成分分别为:2×Phanta Max Buffer25μL,dNTP Mix(10mM each)1μL,DNA polymerse(1U/μL)1μL,上下游引物(10μM)各2μL,cDNA 1μL,H2O 18μL。PCR程序为:95℃预变性3min,35个循环的95℃15s,58℃15s和72℃1min 40s,72℃5min,4℃hold。得到扩增产物。
3、将PCR扩增产物连接到T-easy载体,转化大肠杆菌DH5α,挑取单菌落进行菌落PCR验证,获得阳性菌落进行测序。
二、实验结果
1、测序结果返还之后经过比对分析得到与转录组数据库相匹配的MrUGT78D1基因序列SEQ:NO.1,含有1455个核苷酸,编码484个氨基酸的蛋白质,如SEQ:NO.2所示。将SEQ:NO.2与已报道其他植物UGT进行系统发育树分析,得到图1所示结果。图中红色圆点标注的即为MrUGT78D1。
2、利用MrUGT78D1氨基酸序列与部分已发表具有鼠李糖基转移功能的糖基转移酶比对,结果如图2所示。他们共同含有UDP糖基转移酶保守序列PSPG-box。
实施例2:MrUGT78D1基因的原核表达
一、实验方法
1、设计带有表达载体pET6xHN载体的多克隆酶切位点的特异引物,其引物序列如SEQ:NO.5和SEQ:NO.6所示。
2、以测序正确T-easy载体为模板,用SEQ:NO.5和SEQ:NO.6所示引物进行PCR扩增,PCR反应体系为50μL,成分分别为:2×Phanta Max Buffer 25μL,dNTP Mix(10mM each)1μL,DNA polymerse(1U/μL)1μL,上下游引物(10μM)各2μL,cDNA 1μL,H2O 18μL。PCR程序为:95℃预变性3min,35个循环的95℃15s,58℃15s和72℃1min 40s,72℃5min,4℃hold。
3、将PCR扩增产物连接到用限制性内切酶SalI和HindIII双酶切过的线性pET6xHN载体,获得pET6xHN-MrUGT78D1重组质粒。
4、将pET6xHN-MrUGT78D1重组质粒转化到大肠杆菌BL21(DE3)PlysS表达宿主菌中,经菌落PCR验证,挑取阳性菌落接种到500mL LB(Amp+)液体培养基,37℃培养,直至OD600为0.6~1.0,获得转基因工程菌。
5、在上述转基因的工程菌中加入IPTG至终浓度为0.5mM,16℃诱导24h,收集菌体,500mL收集到1管中,加入20mL 1×PBS缓冲液,充分重悬浮菌体,-80℃放置12h以上。将菌体置于30℃水浴锅解冻后,用超声破碎仪破碎5min。在4℃温度下,10000rpm离心30min,收集上清液。用Clontech HisTALON重力纯化试剂盒进一步纯化,获得目的蛋白。
二、实验结果
利用SDS-PAGE方法检测蛋白表达和纯化效果,结果如图3所示。图中可看出,加上重组标签后在55.86kDa左右有明显的重组蛋白条带,重组蛋白条带大小与预测的一致。纯化的蛋白可用于进一步的酶学分析。
实施例3:MrUGT78D1重组蛋白的酶学活性检测分析
一、实验方法
1、UDP-鼠李糖溶液:由于本研究进行时UDP-鼠李糖无商业购买途径,因此参照发表文献并作一定修改,通过生物合成方式,实验室自行制备。利用茶叶UDP-鼠李糖合成酶CsRHM催化,反应体系为200μl,含有100mM的Na2CO3/NaHCO3(pH9.5)缓冲液包含2mM UDP-葡萄糖作为反应底物,3mM的NAD辅酶和3mM的NADPH辅酶,20μl纯化后的CsRHM重组蛋白,37℃温度下反应3小时,得到UDP-鼠李糖制备液。
2、对于黄酮醇底物的酶活性检测,是在总体积100μl,0.1M pH 7.5的Tris-HCl缓冲液中进行,缓冲液包含50μl UDP-鼠李糖制备液作为糖基供体,50μM黄酮醇作为糖基受体,5μg纯化后的重组蛋白和0.1%的DTT。
3、酶反应体系在37℃反应10min后加入等量甲醇停止反应,反应均以空载蛋白作为对照,获得酶反应产物。
4、酶反应产物经HPLC进行检测鉴定,所述HPLC检测条件如下:Waters 2695-2996DAD检测器,ODS C18柱(4.6×250mm)色谱柱。以含0.1%甲酸水溶液(溶液A)和含0.1%甲酸的100%乙腈(溶液B)为流动相,洗脱梯度为:0-7min,10%-50%B;7-10min,50%B;10-15min,50%-100%B;15-15.1min,100%-10%B;15.1-20min,10%B。检测波长为370nm,柱温为25℃,流速为1ml/min,进样体积为10μl。
二、实验结果
结果如图4所示,MrUGT78D1重组蛋白以UDP-鼠李糖作为糖基供体,可选择性地催化杨梅素、槲皮素3-OH糖基化,生成与标准品一致的杨梅素3-O-鼠李糖苷、槲皮素3-O-鼠李糖苷,催化流程如图5所示,说明MrUGT78D1重组蛋白具有黄酮醇3-O-鼠李糖基转移酶活性。
序列表
<110> 浙江大学
<120> 杨梅黄酮醇3-O-鼠李糖基转移酶基因及编码蛋白和应用
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aagccaacat ccgtagctta tattagcttt ggaacggtgg ctgcggtgcc acctcacgag 960
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Claims (2)
1.一种黄酮醇3-O-鼠李糖基转移酶基因及其编码蛋白在生物合成黄酮醇3-O-鼠李糖苷中的应用,其特征在于,该基因的核苷酸序列如SEQ:NO.1所示,该基因编码蛋白的氨基酸序列如SEQ:NO.2所示。
2.根据权利要求1所述的应用,其特征在于,通过在大肠杆菌中表达重组质粒pET6xHN-MrUGT78D1,得到杨梅黄酮醇3-O-鼠李糖基转移酶重组蛋白,利用UDP-鼠李糖苷作为糖基供体将黄酮醇转化成黄酮醇3-O-鼠李糖苷,所述重组质粒是将黄酮醇3-O-鼠李糖基转移酶基因连接到pET6xHN载体中构建获得。
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