CN113912740A - 一种非洲猪瘟病毒i177l基因原核表达载体的方法 - Google Patents

一种非洲猪瘟病毒i177l基因原核表达载体的方法 Download PDF

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CN113912740A
CN113912740A CN202111229660.3A CN202111229660A CN113912740A CN 113912740 A CN113912740 A CN 113912740A CN 202111229660 A CN202111229660 A CN 202111229660A CN 113912740 A CN113912740 A CN 113912740A
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陆月馨
叶建强
尹雪凤
胡凤洁
徐小龙
谢菁
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Abstract

本发明涉及一种非洲猪瘟病毒I177L基因原核表达载体的方法,包括下述步骤:1)利用下述引物,以pGEX‑6p‑1质粒为模板,PCR扩增出pGEX‑6p‑1线性化表达载体;上游引物:5‘TAATGACGGTGAAAACCTCTGACACATGC 3’;下游引物:5‘CATGGGCCCCTGGAACAGAACTTCCAGAT 3’;2)利用下述引物,以质粒pMD19T‑I177L为模板,PCR扩增出I177L原核表达片段;上游引物:5‘GTTCCAGGGGCCCATGTATGAAATTATTTTG3’;下游引物:5‘GTTTTCACCGTCATTAAAAGTAGATGAAC3’;3)利用重组酶ExnaseTM II对步骤1)和2)得到的PCR扩增产物进行快速重组克隆,得到阳性克隆;阳性克隆经IPTG诱导后进行表达鉴定与纯化,获得纯化的I177L融合蛋白。通过本发明,将获得非洲猪瘟I177L基因的表达载体,实现I177L基因在大肠杆菌中的表达,获得纯化的GST‑I177L融合蛋白。

Description

一种非洲猪瘟病毒I177L基因原核表达载体的方法
技术领域
本发明涉及一种非洲猪瘟病毒I177L基因原核表达载体的方法,属于兽医学技术领域。
背景技术
非洲猪瘟病毒为线性双股DNA病毒,为非洲猪瘟病毒科的唯一成员,且是唯一已知的虫媒DNA病毒,能引起家猪和野猪感染的一种急性、烈性、高度接触的传染性疾病。急性型表现高热、出血斑,死亡率极高,可达到100%,其余类型出现精神沉郁、共济失调、呼吸困难等临床症状,给全球养猪业造成了巨大经济损失。I177L基因是新鉴定的非洲猪瘟毒力基因,位于ASFV基因组中间的稳定区,负责编码177个氨基酸,在病毒感染晚期表达。近年来研究发现敲除I177L 基因可以获得毒力减弱的毒株,家猪免疫后临床表现正常,并且对亲本毒株起到完全保护作用,不排毒。Borca Manuel V等又在ASFV-G-ΔI177L的基础上敲除了ASFV基因组中多基因家族(Multigene families,MGF)的八个基因,构建了衍生毒株ASFV-G-ΔI177L/ΔLVR克服了原毒株只能在原代猪巨噬细胞中复制的缺点,为商品化疫苗的开发提供了可能。然而,对于I177L蛋白的生物学功能和作用机制还不甚清楚,本发明对非洲猪瘟病毒I177L基因进行克隆的基础上,构建其原核表达载体pGEX-6P-1-I177L并实现高效表达,获得GST-I177L融合蛋白,对该蛋白后续研究具有重要意义。
发明内容
本发明目的在于针对上述存在的问题,提供一种非洲猪瘟病毒I177L基因原核表达载体的方法,实现I177L蛋白的高效表达,为后续I177L蛋白生物学功能研究和基因缺失苗鉴别诊断试剂的开发提供条件。本发明的原理和最核心的技术是利用重组酶ExnaseTMII的同源重组克隆,构建I177L原核表达载体并实现 GST-I177L融合蛋白的高效表达。
本发明的目的是这样实现的:一种非洲猪瘟病毒I177L基因原核表达载体的方法,其特征在于,包括下述步骤:
1)利用下述引物,以pGEX-6p-1质粒为模板,PCR扩增出pGEX-6p-1线性化表达载体;
上游引物:5‘TAATGACGGTGAAAACCTCTGACACATGC 3’;
下游引物:5‘CATGGGCCCCTGGAACAGAACTTCCAGAT 3’;
2)利用下述引物,以质粒pMD19T-I177L为模板,PCR扩增出I177L原核表达片段;
上游引物:5‘GTTCCAGGGGCCCATGTATGAAATTATTTTG3’;
下游引物:5‘GTTTTCACCGTCATTAAAAGTAGATGAAC3’;
3)利用重组酶ExnaseTM II对步骤1)和2)得到的PCR扩增产物进行快速重组克隆,得到阳性克隆;阳性克隆经IPTG诱导后进行表达鉴定与纯化,获得纯化的I177L融合蛋白。
步骤3)中,阳性克隆转化到BL21细菌,经IPTG诱导获得GST-I177L融合蛋白。
本发明方法先进科学,通过本发明,提供了一种非洲猪瘟病毒I177L基因原核表达载体的方法,其中,一种非洲猪瘟病毒I177L基因载体pGEX-6p-1,为现有研究中存在的多个问题提供可选择的条件。本发明公开了PCR扩增pGEX-6p-1 线性化载体引物以及PCR扩增非洲猪瘟病毒I177L基因引物序列。本发明还公开了一种基于重组酶ExnaseTM II并利用pGEX-6p-1线性化载体以及PCR扩增 I177L基因体外一步骤克隆技术;并转化到大肠杆菌,实现I177L蛋白高效表达。
本发明的具体步骤为:
(1)利用下述引物,以pGEX-6p-1质粒为模板,PCR扩增出pGEX-6p-1线性化表达载体;
上游引物:5‘TAATGACGGTGAAAACCTCTGACACATGC 3’;
下游引物:5‘CATGGGCCCCTGGAACAGAACTTCCAGAT 3’;
(2)利用下述引物,以质粒pMD19T-I177L为模板,PCR扩增出I177L原核表达片段;
上游引物:5‘GTTCCAGGGGCCCATGTATGAAATTATTTTG3’;
下游引物:5‘GTTTTCACCGTCATTAAAAGTAGATGAAC3’。
(3)利用重组酶ExnaseTM II将线性化载体pGEX-6p-1和I177L基因的PCR 扩增产物进行连接重组反应,得到阳性克隆,并转化到BL21细菌,经IPTG诱导可获得GST-I177L融合蛋白。
本发明的有益效果为:
本发明设计的引物及基于重组酶ExnaseTM II的克隆策略,可不经酶切快速构建出非洲猪瘟病毒I177L基因的原核表达载体pGEX-6p-1-I177L,并以此原核表达载体实现非洲猪瘟病毒I177L高效表达及纯化融合蛋白,为深入研究I177L 生物学功能及基于ASFV-G-ΔI177L基因缺失苗鉴别诊断试剂的开发具有重要意义。
综上,本发明涉及一种非洲猪瘟病毒I177L基因原核表达载体的方法。具体内容包括利用同源重组技术,将I177L基因克隆至线性化载体pGEX-6P-1中,转化大肠杆菌,经IPTG诱导后,获得GST-I177L的融合表达蛋白,并成功对融合蛋白进行纯化。本发明将获得非洲猪瘟I177L基因的表达载体,实现I177L 基因在大肠杆菌中的表达,获得纯化的GST-I177L融合蛋白,表达载体构建和 I177L融合蛋白的纯化为进一步探究I177L基因生物学功能和诊断试剂盒的开发奠定了理论基础。
附图说明
图1PCR扩增线性化载体pGEX-6p-1和I177L原核基因片段。泳道M,DNA Marker;泳道1,线性化载体pGEX-6p-1的PCR产物;泳道2,GST-I177L基因的PCR产物。
图2SDS-PAGE分析I177L融合蛋白的表达和纯化。泳道M,蛋白Marker;泳道1,GST菌体破碎上清;泳道2,GST菌体破碎沉淀;泳道3,GST-I177L 菌体破碎上清;泳道4,GST-I177L菌体破碎沉淀;泳道5,GST琼脂糖凝胶柱首次滤液;泳道6,纯化后GST-I177L蛋白。
图3Western Blot鉴定I177L融合蛋白。泳道M,蛋白Marker;泳道1, GST菌体破碎沉淀;泳道2,GST菌体破碎上清;泳道3,GST-I177L菌体破碎沉淀;泳道4,GST-I177L菌体破碎上清。
具体实施方式
为更好的理解本发明的内容,以下实施方式结合图表给出了GST-I177L融合蛋白高效表达及纯化的示例。
1)、设计扩增pGEX-6p-1线性化表达载体和I177L基因片段引物,具体引物序列见表1,由南京金斯瑞生物科技有限公司合成。
2)、pGEX-6p-1线性化表达载体和I177L基因原核片段扩增:以pGEX-6p-1 质粒为模版,pGF和pGR作为引物(序列见表1),扩增线性化pGEX-6p-1,反应体系为:20μl水,25μl2X Phanta Max Master Mix,2μl 10μmol上游引物,2μl 10μmol下游引物,1μl10ng/μl的pGEX-6p-1。PCR扩增反应循环参数为:95℃预变性3分钟,随后进行30个循环(95℃变性30秒,57℃退火30秒,72℃延伸3分钟),最后72℃延伸10分钟。以I177L cDNA为模板,pG-I177L-2F和pG-I177L-2R作为引物(序列见表1)扩增I177L原核表达片段,反应体系为:20μl水,25μl 2X Phanta Max Master Mix,2μl 10 μmol上游引物,2μl 10μmol下游引物,1μl10ng/μl的cDNA模板。PCR 扩增反应循环参数为:95℃预变性3分钟,随后进行30个循环(95℃变性 30秒,55℃退火30秒,72℃延伸3分钟),最后72℃延伸10分钟。PCR 结束后,将PCR产物在1%的琼脂糖凝胶中进行电泳。如图1所示,其中泳道M 为DNA Marker,泳道1为线性化载体pGEX-6p-1的PCR产物,泳道2为I177L 原核片段PCR产物。
3)、原核表达载体pGEX-6P-1-I177L的构建:通过胶回收获得的pGEX-6P-1 线性化载体和I177L片段PCR产物在商品化重组酶ExnaseTM II的作用下进行重组克隆,如图1中的步骤2。具体重组反应体系如下:纯化的I177L片段产物 50-100ng,纯化的pGEX-6p-1线性化表达载体50ng,2μl商品化的ExnaseTM II 酶,4μl 5×CEⅡbuffer,其它补加水至20μl。反应物于37℃作用30分钟后,置冰上5分钟。随后将20μl反应物转化到常规感受态细菌DH5α中,涂 LB板。次日挑取细菌克隆,菌落PCR鉴定阳性者送擎科公司测序,将序列正确者提取质粒,保存于-20℃待用。
4)、非洲猪瘟病毒I177L蛋白诱导表达及其纯化:将构建好的 pGEX-6P-1-I177L重组质粒转化BL21感受态细胞,涂板,挑取单菌落加入含AMP 的LB培养液中摇床培养过夜;将菌液以1∶100比例转接种到含有AMP的LB培养基中,经过反复摸索发现37℃摇菌3h后,加入终浓度为0.5mM的IPTG,16℃诱导12h后蛋白表达量最高,后超声破碎2-3min,完成后将样品4℃10000r/min 离心10min,分离上清与沉淀,金属浴98℃煮样10min后,进行SDS-PAGE(5%的浓缩胶,12%的分离胶)以及Western blot分析(以抗鼠源的GST单抗为一抗, HRP标记的羊抗鼠IgG为二抗)鉴定表达情况。在图2中,转化菌体裂解产物的上清和沉淀中均可见一特异条带,证明重组子能够正常表达。在确定I177L的可溶性表达基础上,大量摇菌并超声破碎,通过GST琼脂糖凝胶柱纯化得到可溶性融合蛋白GST-I177L。图2中泳道6是I177L蛋白纯化后SDS-PAGE分析结果。在图3中Western blot结果显示GST-I177L融合蛋白能与抗GST单抗发生特异性反应,与预期大小一致,进一步证明GST-I177L融合蛋白表达的正确性。
表1扩增线性化pGEX-6p-1载体和ASFV病毒GST-I177L基因片段引物设计
Figure RE-GDA0003395945530000051
序列表
<110> 扬州大学
<120> 一种非洲猪瘟病毒I177L基因原核表达载体的方法
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Claims (2)

1.一种非洲猪瘟病毒I177L基因原核表达载体的方法,其特征在于,包括下述步骤:
1)利用下述引物,以pGEX-6p-1质粒为模板, PCR扩增出pGEX-6p-1线性化表达载体;
上游引物:5‘TAATGACGGTGAAAACCTCTGACACATGC 3’;
下游引物:5‘CATGGGCCCCTGGAACAGAACTTCCAGAT 3’;
2)利用下述引物,以质粒pMD19T-I177L为模板,PCR扩增出I177L原核表达片段;
上游引物:5‘GTTCCAGGGGCCCATGTATGAAATTATTTTG 3’;
下游引物:5‘GTTTTCACCGTCATTAAAAGTAGATGAAC 3’;
3)利用重组酶ExnaseTM II对步骤1)和2)得到的PCR扩增产物进行快速重组克隆,得到阳性克隆;阳性克隆经IPTG诱导后进行表达鉴定与纯化,获得纯化的I177L融合蛋白。
2.根据权利要求1所述的一种非洲猪瘟病毒I177L基因原核表达载体的方法,其特征在于,步骤3)中,阳性克隆转化到BL21细菌,经IPTG诱导获得GST-I177L融合蛋白。
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106520809A (zh) * 2016-10-12 2017-03-22 扬州大学 一种GyV3新型环形病毒VP3融合蛋白的制备方法
WO2021061189A1 (en) * 2019-09-24 2021-04-01 The United States Of America, As Represented By The Secretary Of Agriculture Development of a novel live attenuated african swine fever vaccine based in the deletion of gene i177l

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106520809A (zh) * 2016-10-12 2017-03-22 扬州大学 一种GyV3新型环形病毒VP3融合蛋白的制备方法
WO2021061189A1 (en) * 2019-09-24 2021-04-01 The United States Of America, As Represented By The Secretary Of Agriculture Development of a novel live attenuated african swine fever vaccine based in the deletion of gene i177l

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