CN112812177A - 一种鼠源性抗猪传染性胃肠炎病毒的单链抗体及其制备方法 - Google Patents
一种鼠源性抗猪传染性胃肠炎病毒的单链抗体及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种鼠源性抗猪传染性胃肠炎病毒的单链抗体及其制备方法,由小鼠的抗TGEV单克隆杂交瘤细胞扩增抗体的重链可变区和重链可变区,经linker相连,克隆进原核表达载体,单链抗体的氨基酸序列如所示SEQ ID No.2所示。经诱导表达、纯化得到的单链抗体分子量约为28kDa,ELISA显示单链抗体可特异性识别猪传染性胃肠炎病毒,假病毒中和试验显示单链抗体可中和TGEV假病毒感染PK15细胞的能力,抗TGEV单链抗体有望中和病毒在仔猪体内的感染性,阻断病毒在仔猪群中的感染和传播。
Description
技术领域
本发明属于抗体工程的技术领域,具体涉及一种鼠源性抗猪传染性胃肠炎病毒的单链抗体及其制备方法。
背景技术
猪传染性胃肠炎病毒(TGEV)属于冠状病毒科冠状病毒属。不同年龄段和品种的猪感染TGEV可引起急性传染性疾病,主要临床症状为水样腹泻、呕吐和脱水,2周龄以内的仔猪感染TGEV极容易引起脱水死亡,死亡率高达100%。1946年,Doyle等确定了病原体TGEV,随后在各大洲都发现了该病毒,已成为世界性的猪传染性疾病,我国自60年代起出现TGEV的报道,近年来有进一步流行的趋势,尤其是冬季和早春寒冷季节常呈地方性暴发流行,给生猪养殖业带来极大损失,一定程度上推高了猪肉价格。TGEV在猪呼吸道、十二指肠、回肠和空肠中均可检测到,可经粪便和鼻腔分泌物排出并传染,猪感染 TGEV后免疫力下降明显,对其它疾病的抵抗力显著减弱。目前该病毒感染的主要预防手段是接种疫苗,包括灭活疫苗和减毒活疫苗。妊娠母猪经口、鼻、肌肉和乳腺内接种疫苗可产生乳汁免疫,我国哈尔滨兽医研究所研制的TGEV和猪流行性腹泻的二联细胞培养灭活疫苗具有良好的免疫效果。
现有预防手段主要是针对母猪进行疫苗接种,而无法直接刺激仔猪的免疫系统,由于仔猪的免疫系统未发育完全,不能产生针对TGEV 的主动免疫,因此直接给仔猪提供抗体等被动免疫措施尤为重要。例如专利CN106632670A公开的抗TGEV的单链抗体及其制备方法,采集抗TGEV血清抗体阳性的仔猪白细胞,获得抗体重链可变区和轻链可变区序列。但是通过猪源抗体获得序列存在下列缺陷:仔猪感染TGEV 后死亡率接近100%,很少有存活仔猪产生抗体;从仔猪血液中分离白细胞获得抗体序列,无法鉴定对TGEV具有高亲和力和特异性的抗体。
单链抗体是利用基因工程的办法将抗体的重链可变区和轻链可变区通过一个linker相连,能够特异性结合病毒并中和病毒感染性,单链抗体的分子量较小、穿透能力强于完整抗体,且来源于单克隆抗体的单链抗体具有高亲和力和特异性的特点,在仔猪体内能够中和病毒,适用于给仔猪提供即刻被动免疫。
发明内容
本发明的目的是提供一种鼠源性抗TGEV的单链抗体,单链抗体可特异性识别TGEV,从而有望中和TGEV的感染性,阻断TGEV在仔猪群中的感染和传播,同时还提供一种利用大肠埃希菌表达可溶性抗 TGEV的单链抗体的制备方法。
本发明解决上述技术问题采用的技术方案为:
一种鼠源性抗猪传染性胃肠炎病毒的单链抗体,所述单链抗体具有如SEQ IDNo.1所示的核酸序列以及如SEQ ID No.2所示的氨基酸序列;所述单链抗体具有如SEQ IDNo.3所示抗体重链可变区的氨基酸序列,如SEQ ID No.4所示抗体轻链可变区的氨基酸序列,以及位于重链可变区和轻链可变区之间的linker氨基酸序列。
SEQ ID No.1核酸序列展示如下
GGTACCGACGACGACGACAAGCAGGTGCAGCTGCAGCAGCCGGGCGCGGAACTGG TGCGCCCGGGCAGCAGCGTGAAACTGAGCTGCAAAGCGAGCGGCTATACCTTTACCAGC TGGTATATGCATTGGGTGAAACAGCGCCCGATTCAGGGCCTGGAATGGCTGGGCAACAT TGATCCGAGCGATAGCGAAACCCATTATAACCAGAAATTTAAAGATAAAGTGACCCTGA CCGTGGATAAAAGCAGCAGCACCGCGTATATGCAGCTGAGCAGCCTGACCAGCGAAGATACCGCGGTGTATTATTGCGCGCGCCGCACCTATTATGATTATGCGCATTGGTATTTTGA TGTGTGGGGCGCGGGCACCACCGTGACCGTGAGCAGCGGAGGCGGTGGCTCGGGCGGTG GCGGCTCGGGTGGCGGTGGTTCTGATATTGTGATGACCCAGAGCCCGGCGAGCCTGGCG GTGAGCCTGGGCCAGCGCGCGACCATTAGCTGCCGCGCGAGCGATAGCGTGGAATATCA TGCGGGCAGCCTGATGCAGCGCTATCAGCAGAAACCGGGCCAGCCGCCGAAACTGCTGA TTTATGCGGCGAGCAACGTGGAAAGCGGCGTGCCGGCGCGCTTTAGCGGCAGCGGCAGC GGCACCGATTTTAGCCTGAACATTCATCCGGTGGAAGAAGATACCGCGATGTATTATTG CCAGCAGAGCCATAAAGTGCCGTGGACCTTTGGCGGCGGCACCAAACTGGAAATTAAAC TCGAGCACCACCACCACCACCACTGA
SEQ ID No.2氨基酸序列展示如下:
QVQLQQPGAELVRPGSSVKLSCKASGYTFTSWYMHWVKQRPIQGLEWLGNIDPSD SETHYNQKFKDKVTLTVDKSSSTAYMQLSSLTSEDTAVYYCARRTYYDYAHWYFDVWGA GTTVTVSSGGGGSGGGGSGGGGSDIVMTQSPASLAVSLGQRATISCRASDSVEYHAGSL MQRYQQKPGQPPKLLIYAASNVESGVPARFSGSGSGTDFSLNIHPVEEDTAMYYCQQSH KVPWTFGGGTKLEIKLEHHHHHH
SEQ ID No.3抗体重链可变区的氨基酸序列展示如下:
QVQLQQPGAELVRPGSSVKLSCKASGYTFTSWYMHWVKQRPIQGLEWLGNIDPSD SETHYNQKFKDKVTLTVDKSSSTAYMQLSSLTSEDTAVYYCARRTYYDYAHWYFDVWGA GTTVTVSS
SEQ ID No.4抗体轻链可变区的氨基酸序列展示如下:
DIVMTQSPASLAVSLGQRATISCRASDSVEYHAGSLMQRYQQKPGQPPKLLIYAA SNVESGVPARFSGSGSGTDFSLNIHPVEEDTAMYYCQQSHKVPWTFGGGTKLEIK
所述单链抗体中的核酸序列中包含限制性酶切位点Kpn I和Xho I,Kpn I酶切位点为GGTACC,Xho I酶切位点为CTCGAG。
优选的,所述单链抗体中的氨基酸序列C端为一个6×His纯化标签,序列为HHHHHH。
所述单链抗体中的包含载体和宿主菌,所述载体为原核表达载体,所述宿主菌为大肠埃希菌E.coli BL21 gold(DE3)。
一种鼠源性抗猪传染性胃肠炎病毒单链抗体的制备方法,具体制备步骤如下:
S01:采用RT-PCR法从抗猪传染性胃肠炎病毒的单克隆杂交瘤细胞中扩增编码抗体基因的重链可变区与轻链可变区;
S02:人工合成scFv序列,包括重链可变区核酸序列VH、连接肽序列linker、轻链可变区核酸序列VL以及5’端酶切位点Kpn I和3’端酶切位点Xho I,序列如SEQ ID No.1所示;
S03:利用Kpn I和Xho I双酶切scFv片段和pET-32a载体,将 scFv片段克隆进pET-32a载体中,得到原核表达载体pET-32a-ScFv。
S04:步骤(S03)的pET-32a-ScFv载体转化感受态大肠埃希菌E.coli BL21 gold(DE3)中,构建原核表达宿主菌;
S05:用IPTG诱导步骤(S04)的原核表达宿主菌表达分泌型单链抗体,从上清中经Ni-NTA亲和层析分离纯化得到单链抗体;
S06:纯化抗体经肠激酶切割,去掉促进可溶性表达的硫氧还蛋白(Trx)标签,得到不含rx的单链抗体。
与现有技术相比,本发明的有益效果为:
本发明通过RT-PCR从抗TGEV的单克隆杂交瘤细胞中扩增抗体的重链可变区基因(VH)和轻链可变区基因(VL),人工合成经linker 连接的VH和VL,并克隆进原核表达载体pET-32a,30℃下IPTG诱导宿主菌E.coli BL21 gold(DE3)表达可溶性scFv。经超声破碎后,用Ni-NTA亲和层析从细菌上清中分离scFv。ELISA证明scFv可特异性识别TGEV;本发明通过利用抗TGEV的单克隆抗体重链可变区和轻链可变区序列构建了单链抗体,特异性和亲和力优于抗体库筛选出的单链抗体,单链抗体有望中和TGEV的感染性,阻断TGEV在仔猪群中的感染和传播。
以下将结合附图与具体的实施例对本发明进行详细的解释说明。
附图说明
图1为PCR扩增的重链可变区核酸电泳图;
图2为PCR扩增的轻链可变区核酸电泳图;
图3为pET-32a-scFv载体构建示意图;
图4为PCR鉴定pET-32a-scFv载体中插入的scFv片段示意图;
图5为pET-32a-scFv载体的双酶切鉴定示意图;
图6为E.coli表达并经过Ni-NTA纯化的scFv示意图;
图7为肠激酶切割后并经分离纯化的scFv电泳图;
图8为ELISA证明抗TGEV scFv特异性结合TGEV示意图;
图9为抗TGEV scFv中和TGEV假病毒感染PK15细胞示意图;
图10为抗TGEV scFv中和TGEV假病毒感染PK15细胞数量增量变化示意图;
具体实施方式
实施例中采用的各种试剂、耗材和试验材料均购自商业公司,各试验方法均为试剂盒说明书所述方法。试验各步骤的中间产物和终产物均经过重复试验证明可重复。按照本发明陈述的试验方法,可以获得本发明各步骤所涉及的中间产物和终产物。实施例中的定量检测试验均为三次重复试验取平均值。
限制性内切酶Kpn I和Xho I、DNA纯化试剂盒、RNA提取试剂盒和反转录试剂盒为Takara公司的产品。DNA marker DL2000为 Invitrogen公司的产品。TGEV毒株、pET-32a载体、E.coliBL21 gold (DE3)和小鼠抗TGEV杂交瘤细胞为安徽九川生物科技有限公司实验室保存。
实施例1是鼠源性抗TGEV单链抗体的制备。
(1)用本实验室保存的TGEV毒株通过皮下注射的方式免疫 Balb/c小鼠。ELISA检测免疫后小鼠血清,当抗TGEV血清抗体效价>1:104时,采集小鼠脾脏细胞,与sp20细胞融合制成杂交瘤细胞,利用TGEV抗原筛选出特异性识别TGEV的单克隆抗体分泌杂交瘤细胞。
(2)培养单克隆杂交瘤细胞,用RNA提取试剂盒(Takara公司) 提取总RNA。以提取的总RNA为模板,使用反转录试剂盒(Takara公司)反转录为cDNA。根据GenBank公布的鼠源性单克隆抗体的重链可变区序列和轻链可变区序列设计引物(表1),扩增鼠源性抗TGEV 单克隆抗体的重链可变区和轻链可变区。引物由深圳华大基因公司合成。
(3)抗体重链可变区和轻链可变区的扩增
以cDNA为模板,扩增重链可变区的引物为VHF GAGGTGAAGCTTCTCGAGTC,VHRTGAGGAGACGGTGACCGTGG;扩增轻链可变区的引物为VLF CTGCTGCTCTGGGTTCC,VLRGAAGATGGATACAGTTGGTGC。PCR反应体系为:PCR mix 2μl,Pfu DNA 聚合酶1μl,Forward引物0.5μl,Reverse引物0.5μl,cDNA 1μl,PCR缓冲液2μl和13μl H2O。扩增程序为:95℃预变性2min,94℃变性30s,60℃退火30s,72℃延伸30s,30个循环, 72℃延伸10min。DNA纯化试剂盒回收PCR扩增产物。经PCR扩增得到如SEQ ID No.5所示重链可变区核酸序列以及如SEQ IDNo.6所示轻链可变区核酸序列。
(4)上海生工生物工程股份有限公司合成scFv序列,由重链可变区核酸序列VH、连接肽序列linker、轻链可变区核酸序列VL以及 5’端酶切位点Kpn I和3’端酶切位点Xho I,完整序列如SEQ ID No.1 所示。限制性内切酶Kpn I和Xho I同时对pET-32a载体和合成的scFv序列双酶切,酶切体系为:1μl Kpn I,1μl Xho I,2μl 10×缓冲液,10μl scFv和6μlH2O;1μl Kpn I,1μl Xho I, 2μl 10×缓冲液,2μl pET-32a和14μl H2O。37℃水浴酶切2h。使用DNA纯化试剂盒回收scFv片段和载体的酶切产物。scFv片段与 pET-32a相连,连接体系为:5μl scFv片段,1μl载体酶切产物, 1μl T4连接酶,1μl连接缓冲液,2μl H2O。16℃水浴连接1h。连接产物转化感受态E.coli BL21 gold(DE3)。挑取单菌落,通过 PCR和测序鉴定确定pET-32a载体中正确插入scFv的克隆,命名为 pET-32a-scFv。
(5)单链抗体的诱导表达
E.coli BL21菌株接种200ml氨苄青霉素LB培养基中,37℃、 220rpm振荡培养至OD600约等于0.8,加入IPTG至终浓度0.6mM,继续30℃、220rpm振荡培养过夜(约8小时)。8000rpm离心收集菌体,PBS清洗一次。加入超声破碎缓冲液:50mM Tris-HCl、1mM EDTA、150mM NaCl、0.5%Triton-X 100、pH 8.0,低温下超声破碎。破碎后离心12000rpm、4℃、30min。丢弃裂解产物,保留上清。
(6)单链抗体的纯化
使用Ni-NTA Hisband(默克)纯化上清中的scFv。上清经0.45 μm滤膜过滤,加入Ni柱,流出液重复加入Ni柱一次,加入结合缓冲液(50mM NaH2PO4、300mM NaCl、10mM咪唑,pH8.0),加入一个柱体积的漂洗缓冲液(50mM NaH2PO4、300mM NaCl、20mM咪唑, pH 8.0),清洗非特异性结合蛋白质至A280接近零,再加入20ml洗脱缓冲液(50mM NaH2PO4、300mM NaCl、200mM咪唑,pH 8.0)洗脱单链抗体,收集洗脱液,每管1ml。
(7)收集洗脱液,在Tris-HCl pH 8.0缓冲液中透析,超滤浓缩至蛋白质浓度约为0.5mg/ml。
(8)肠激酶切割
0.5mg蛋白(0.5mg/ml)与1U重组肠激酶(Solarbio)在25℃共孵育过夜完成酶切;酶切产物按照上述步骤(6)和步骤(7)纯化切割的scFv,并透析浓缩,得到纯化的scFv,分子量约为28kDa;
实施例2是鼠源性抗TGEV单链抗体的鉴定。
(1)ELISA鉴定单链抗体结合TGEV的特异性;
用TGEV和对照PEDV病毒原液(100μl/孔)包被96孔板,设置缓冲液包被的空白对照孔,4℃湿盒包被过夜。第二天弃去包被液,每孔加200μl脱脂牛奶封闭液,37℃湿盒封闭2h。弃去封闭液, PBST洗两遍,加入倍比稀释的抗TGEV scFv(32、16、8、4、2、1μ g/ml),37℃湿盒孵育1h。弃去scFv,PBST洗两遍,加100μl HRP 标记的小鼠抗His tag IgG二抗(1:2000),37℃湿盒孵育1h。弃去二抗,PBST洗两遍,加入TMB显色底物,每孔100μl,37℃避光孵育15min,加1M H2SO4终止显色反应。用酶标仪(BioTek)读取波长450nm的吸光度。
假病毒中和试验鉴定单链抗体对TGEV的中和活性;
利用慢病毒系统pLP构建TGEV S蛋白的假病毒,pLP-TGEV-GFP 表达GFP荧光蛋白,用于定性检测假病毒感染靶细胞PK15细胞(猪肾细胞系)的活性;pLP-TGEV-luciferase表达荧光素酶报告基因,用于定量检测假病毒感染PK15细胞的活性。
PK15细胞(104)接种于96孔板,5%CO2,37℃培养过夜,第二天形成细胞单层;假病毒pLP-TGEV-GFP/luciferase(104感染单位) 与梯度稀释的抗TGEV scFv(0.1、0.01、0.001、0.0001μg/ml)在 37℃共孵育30min,然后加入PK15细胞中,100μl/孔,37℃感染 24h后弃去,更换DMEM+10%FCS培养基继续培养48h;使用TGEV 免疫的小鼠血清作为中和试验的阳性对照(1:1000稀释),阴性对照孔不加抗血清或scFv;在荧光显微镜下观察PK15细胞表达的GFP,定性评价scFv中和假病毒感染PK15细胞的活性;利用化学发光仪检测PK15细胞表达的荧光素酶,定量评价scFv中和假病毒感染PK15 细胞的活性。
上述结合附图对本发明进行了示例性描述,显然本发明具体实现并不受上述方式的限制,只要采用了本发明的方法构思和技术方案进行的这种非实质改进,或未经改进将本发明的构思和技术方案直接应用于其他场合的,均在本发明的保护范围之内。
Claims (5)
1.一种鼠源性抗猪传染性胃肠炎病毒的单链抗体,其特征在于,所述单链抗体具有如SEQ ID No.1所示的核酸序列以及如SEQ ID No.2所示的氨基酸序列;所述单链抗体具有如SEQ ID No.3所示抗体重链可变区的氨基酸序列,如SEQ ID No.4所示抗体轻链可变区的氨基酸序列,以及位于重链可变区和轻链可变区之间的linker氨基酸序列。
2.根据权利要求1所述的的一种鼠源性抗猪传染性胃肠炎病毒的单链抗体,其特征在于,所述单链抗体中的核酸序列中包含限制性酶切位点Kpn I和Xho I,Kpn I酶切位点为GGTACC,Xho I酶切位点为CTCGAG。
3.根据权利要求1所述的的一种鼠源性抗猪传染性胃肠炎病毒的单链抗体,其特征在于,所述单链抗体的氨基酸序列C端为一个6×His纯化标签,序列为HHHHHH。
4.根据权利要求1所述的的一种鼠源性抗猪传染性胃肠炎病毒的单链抗体,其特征在于,所述单链抗体中的载体和宿主菌,所述载体为原核表达载体,所述宿主菌为大肠埃希菌E.coliBL21 gold(DE3)。
5.一种鼠源性抗猪传染性胃肠炎病毒单链抗体的制备方法,其特征在于,具体制备步骤如下:
S01:采用RT-PCR法从抗猪传染性胃肠炎病毒的单克隆杂交瘤细胞中扩增编码抗体基因的重链可变区与轻链可变区;
S02:人工合成scFv序列,包括重链可变区核酸序列VH、连接肽序列linker、轻链可变区核酸序列VL以及5’端酶切位点Kpn I和3’端酶切位点Xho I,序列如SEQ ID No.1所示;
S03:利用Kpn I和Xho I双酶切scFv片段和pET-32a载体,将scFv片段克隆进pET-32a载体中,得到原核表达载体pET-32a-ScFv。
S04:步骤(S03)的pET-32a-ScFv载体转化感受态大肠埃希菌E.coli BL21 gold(DE3)中,构建原核表达宿主菌;
S05:用IPTG诱导步骤(S04)的原核表达宿主菌表达分泌型单链抗体,从上清中经Ni-NTA亲和层析分离纯化得到单链抗体;
S06:纯化抗体经肠激酶切割,去掉促进可溶性表达的硫氧还蛋白(Trx)标签,得到不含rx的单链抗体。
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