CN111647079A - 一种抗新型冠状病毒n蛋白的中和抗体 - Google Patents
一种抗新型冠状病毒n蛋白的中和抗体 Download PDFInfo
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- CN111647079A CN111647079A CN202010636487.8A CN202010636487A CN111647079A CN 111647079 A CN111647079 A CN 111647079A CN 202010636487 A CN202010636487 A CN 202010636487A CN 111647079 A CN111647079 A CN 111647079A
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Abstract
本发明公开了一种抗新型冠状病毒N蛋白的中和抗体,它由轻链和重链组成,所述轻链可变区的氨基酸序列如SEQ ID NO:1所示,所述重链可变区的氨基酸序列如SEQ ID NO:2所示。本发明所述抗体能够特异性识别和结合SARS‑CoV‑2 N蛋白,实验结果显示,其与2019‑NCOV Nucleocapsid的亲和常数KD值为111nM,EC50值为3.975μg/mL;其与NCOV‑SARI‑N‑his的EC50值为4.752μg/mL。
Description
技术领域
本发明涉及一种来自RNA病毒,具体涉及一种抗新型冠状病毒N蛋白的中和抗体。
背景技术
2019新型冠状病毒的病原体是新型冠状病毒(2019-nCoV,COVID-19或SARS-CoV-2)。SARS-CoV-2属冠状病毒科(Coro-naviridae)冠状病毒属(Coronavirus),是一类有包膜的单股正链RNA病毒。新型冠状病毒基因编码多个结构蛋白,如N蛋白、M蛋白、E蛋白和S蛋白等,S蛋白可特异性地与宿主受体结合,是病毒入侵宿言易感细胞的关键蛋白,M蛋白和E蛋白参考病毒细胞膜的形成,而N蛋白则参与病毒的装配。这些蛋白包括多个抗原表位,利用抗原与抗体特异性结合的原理,可通过抗体检测抗原的存在,从而直接证明样本中含有新型冠状病毒。
新型冠状病毒传播迅速,具有极强的传染性。到目前为止,还没有专门用于预防的疫苗和治疗新型冠状病毒的特效药物,一般采用非特异性治疗,预防严重的并发症,降低重症发病率和死亡率,提高治愈率。目前,各研究机构多是致力于针对SARS-CoV-2的S蛋白研发抗体产品,如公开号CN111333722A的发明专利,采用噬菌体展示技术,构建了一个高容量的人源免疫性噬菌体抗体文库,并以SARS-CoV-2-S蛋白为靶标,筛选人源抗体单链抗体片段并获得了对SARS-CoV-2病毒有较强的中和作用的抗体。又如公开号为CN111303280A的发明专利,公开了一种抗SARS-CoV-2的全人源单克隆抗体,该单抗与S抗原的亲和常数KD是1.0nM。而针对新型冠状病毒N蛋白的抗体产品极少,仅见有公开号为CN111269313A的发明专利公开了一种抗N蛋白单克隆抗体,实验结果显示,采用间接ELISA法测定得到的抗体的相对亲和力为1.835×10-10mol/L。
发明内容
本发明要解决的技术问题是提供一种与N蛋白亲和力较理想的抗新型冠状病毒N蛋白的中和抗体。
本发明所述的抗新型冠状病毒N蛋白的中和抗体,它由轻链和重链组成,其中轻链可变区的氨基酸序列如SEQ ID NO:1所示,重链可变区的氨基酸序列如SEQ ID NO:2所示。
本发明所述的抗新型冠状病毒N蛋白的中和抗体的轻链的氨基酸序列如SEQ IDNO:3所示,重链的氨基酸序列如SEQ ID NO:4所示。该抗体是针对新型冠状病毒N蛋白(SARS-CoV-2N蛋白)的抗体产品,所述的新型冠状病毒N蛋白的氨基酸序列如SEQ ID NO:5所示。
申请人发现,本发明所述抗体能够特异性识别和结合SARS-CoV-2N抗原蛋白,因此,本申请还包括该抗体在制备诊断新型冠状病毒的试剂,或者是在制备治疗新型冠状病毒的药物中的应用。
本申请进一步包括一种诊断和/或治疗和/或预防新型冠状病毒所致疾病的产品,其以本发明所述抗体作为活性成分。
与现有技术相比,本发明所述抗体能够特异性识别和结合SARS-CoV-2N蛋白,实验结果显示,其与2019-NCOV Nucleocapsid(原核表达N蛋白)的亲和常数KD值为111nM,EC50值为3.975μg/mL;其与NCOV-SARI-N-his(真核表达N蛋白)的EC50值为4.752μg/mL。
附图说明
图1为亲和柱纯化后的抗新型冠状病毒N蛋白的中和抗体SDS-PAGE检测图谱,其中M表示标准蛋白分子量;Me表示合并的培养基;FT表示流穿液;W表示洗涤液;E表示纯化后的抗新型冠状病毒N蛋白的中和抗体。
图2为Western Blot验证抗新型冠状病毒N蛋白的中和抗体蛋白表达电泳图,其中M表示标准蛋白分子量;E表示纯化后的抗新型冠状病毒N蛋白的中和抗体。
具体实施方式
下面结合具体实施例对本发明作进一步的详述,以更好地理解本发明的内容,但本发明并不限于以下实施例。
以下内容中出现的“Fab 20抗体”或“Fab 20”均为本发明所述抗新型冠状病毒N蛋白的中和抗体的简称。
实施例1
1.Fab 20抗体的表达及纯化
1.1寻找Fab 20抗体的序列
从SARS-CoV的抗体库中进行筛选、确定SARS-CoV-2N抗原蛋白的Fab 20抗体的氨基酸序列。其中,SARS-CoV-2N蛋白的氨基酸序列、Fab 20抗体的轻链(L chain)可变区的氨基酸序列、重链(H chain)可变区的氨基酸序列以及Fab 20抗体轻链的全长氨基酸序列和重链的全长氨基酸序列分别如下:
所述SARS-CoV-2N蛋白的氨基酸序列为:
MSDNGPQNQRNAPRITFGGPSDSTGSNQNGERSGARSKQRRPQGLPNNTASWFTALTQHGKEDLKFPRGQGVPINTNSSPDDQIGYYRRATRRIRGGDGKMKDLSPRWYFYYLGTGPEAGLPYGANKDGIIWVATEGALNTPKDHIGTRNPANNAAIVLQLPQGTTLPKGFYAEGSRGGSQASSRSSSRSRNSSRNSTPGSSRGTSPARMAGNGGDAALALLLLDRLNQLESKMSGKGQQQQGQTVTKKSAAEASKKPRQKRTATKAYNVTQAFGRRGPEQTQGNFGDQELIRQGTDYKHWPQIAQFAPSASAFFGMSRIGMEVTPSGTWLTYTGAIKLDDKDPNFKDQVILLNKHIDAYKTFPPTEPKKDKKKKADETQALPQRQKKQQTVTLLPAADLDDFSKQLQQSMSSADSTQA(SEQ ID NO:5)。
Fab 20抗体轻链可变区的氨基酸序列为:
EIELTQSPLSLPVTPGEPASISCRSSQSLLHSNGYNYLDWYLQKPGQSPQLLIYLGSNRASGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCMQALQTPTTFGQGTRLEIK(SEQ ID NO:1)。
Fab 20抗体重链可变区的氨基酸序列为:
QVQLLEQSGAEVKKPGSSVKVSCKASGGTFSSYAISWVRQAPGQGLEWMGGTIPIFGTANYAQKFQGRVTITADESTSTAYMELSSLRSEDTAVYYCARGGWSSSAGGYYGMDVWGQGTTVTVSS(SEQ ID NO:2)。
Fab 20抗体的轻链的全长氨基酸序列为:
EIELTQSPLSLPVTPGEPASISCRSSQSLLHSNGYNYLDWYLQKPGQSPQLLIYLGSNRASGVPDRFSGSGSGTDFTLKISRVEAEDVGVYYCMQALQTPTTFGQGTRLEIKRTVAAPSVFIFPPSDEQLKSGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFNRGEC(SEQ ID NO:3)。
Fab 20抗体的重链的全长氨基酸序列为:
QVQLLEQSGAEVKKPGSSVKVSCKASGGTFSSYAISWVRQAPGQGLEWMGGTIPIFGTANYAQKFQGRVTITADESTSTAYMELSSLRSEDTAVYYCARGGWSSSAGGYYGMDVWGQGTTVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKRVEPKSCDKTHHHHHH(SEQ ID NO:4)。
1.2 Fab 20抗体的表达
1.2.1)细胞培养
293F细胞(上海纽普生物科技有限公司),用含10%胎牛血清和100U/mL双抗(青链霉素混合液)的DMEM培养基,于75mL培养瓶培养细胞,细胞计数板检测,确保细胞浓度为:0.5×106细胞/mL。
根据标准操作手册培养悬浮293F细胞,按0.5×106细胞/mL的接种量接种,在1L的摇瓶加入300mL含10%胎牛血清和100U/mL双抗(青链霉素混合液)的DMEM培养基中接种细胞。置于5%二氧化碳浓度的摇床培养箱中孵育24h,摇床设置参数为37℃,120rpm,细胞计数板检测,确保细胞密度达到1×106细胞/mL。
1.2.2)重组质粒的构建
将编码Fab 20的重链(H chain)和轻链(L chain)分别构建到pTT5哺乳动物细胞载体,获得编码Fab20重链重组质粒和轻链重组质粒(由上海纽普生物科技有限公司完成)。取300μg的Fab20重组质粒(重链重组质粒和轻链重组质粒的摩尔比为1.1:0.9)加入30mLPBS,涡旋混合3秒,得到PBS/重组质粒的混合液,冰浴保存。
1.2.3)重组质粒转染至细胞内
取1.2mL过滤除菌的PEI(聚乙烯亚胺)溶液(0.5mg/mL)加入上述的PBS/重组质粒的混合液中,室温下静置20min,得到PBS/重组质粒/PEI混合液。将PBS/重组质粒/PEI混合液加到293F细胞中(共转染比例为1μg DNA:1.5μg PEI:106个细胞)。
1.2.4)表达蛋白的收集
转染成功后,置于原设定条件的二氧化碳浓度的摇床培养箱中孵育。5天后,收集培养上清液,合并含蛋白的DMEM培养基,于-80℃保存。
1.3 Fab 20抗体的纯化
1.3.1)溶液配置
缓冲液:PBS(pH 7.4)。
洗涤液:用PBS配制,20mmol/L咪唑的洗涤液(pH 7.4)。
洗脱液:用PBS配制,500mmol/L咪唑的洗脱液(pH 7.4)。
1.3.2)Ni-NTA装柱(载样量为10-20mg蛋白/mL)
加入3mL Ni-NTA介质,重悬介质后静置。
1.3.3)上样(流速300cm/h)
从-80℃中取出步骤1.2.4)所得的合并的培养基解冻后,使用0.45μm过滤器过滤,并收集流出液作为流穿液。
1.3.4)洗涤(流速300cm/h)
上样完毕后,用5倍柱体积洗涤液洗涤层析柱,收集流出液。
1.3.5)洗脱(流速300cm/h)
用3mL的洗脱液洗脱蛋白,汇集洗脱液。
1.3.6)检测蛋白表达情况
通过SDS-PAGE(聚丙烯酰胺凝胶电泳)检测Fab20抗体蛋白表达情况,检测孔分别为合并的培养基、流穿液、洗涤液、纯化后的Fab20抗体。结果如图1所示。由图1可知,纯化前在合并的培养基中可清晰检测到Fab抗体蛋白表达(25.96KD);纯化后,得到单一且浓度较高(0.45mg/ml)的抗体蛋白,而在流穿液和洗涤液中只有少量抗体蛋白残留,表明Fab抗体蛋白纯化成功。
1.3.7)Western Blot(免疫印迹)验证
利用BeyoECL Plus(超敏ECL化学发光试剂盒)和HRP-Conjugated His-TagAntibody标签抗体(表达成功的Fab20带有His标签)通过Western Blot(免疫印迹)方法验证(结果如图2所示),确定获得Fab20抗体。如图2所示,在25.96KD处检测到一条带,表明该抗体成功表达。
2.ELISA方法检测Fab 20抗体与SARS-CoV-2N蛋白结合力
2.1从市面上购买2019-NCOV Nucleocapsid(原核表达N蛋白,购自近岸蛋白质科技有限公司)、NCOV-SARI-N-his(真核表达N蛋白,购自三优生物医药有限公司)和cyno-BCMA-his抗原蛋白(参照,购自三优生物医药有限公司)。
2.2抗体ELISA检测:
2.2.1)包被:在7块96孔半孔酶标板中,分别加入2μg/mL的NCOV-SARI-N-his(真核表达N蛋白)、2019-NCOV Nucleocapsid(原核表达N蛋白)和cyno-BCMA-his抗原蛋白,前2个抗原的酶标板上的第11列包被抗原cyno-BCMA-his,30μL/孔,4℃包被过夜。
2.2.2)洗板:PBST(含吐温-20的磷酸盐缓冲液,pH 7.4)洗板3次。
2.2.3)封闭:5%PBS-Milk(磷酸缓冲盐溶液-脱脂奶粉),室温孵育2h。
2.2.4)洗板:PBST洗板3次。
2.2.5)加样:稀释液用1%Milk-PBS,NCOV-SARI-N-his、2019-NCOVNucleocapsid、和cyno-BCMA-his的酶标板上的所有样品蛋白均以10μg/mL为初始浓度,在稀释板中,第8行9倍梯度稀释,其余均3倍梯度稀释;30μL/孔加入到各孔中,室温孵育1h。
2.2.6)洗板:PBST洗板3次。
2.2.7)加二抗:稀释液用1%Milk-PBS,1:4000稀释二抗Goat-Anti-Human-IgGKappa+Lambda-HRP(购自Sigma),30μL/孔加入到各孔中,室温孵育50min。
2.2.8)洗板:PBST洗板9次。
2.2.9)加TMB(3,3',5,5'-四甲基联苯胺,购自SurModics):30μL/孔,室温,避光显色1min~5min。
2.2.10)终止反应:加2mol/L盐酸,30μL/孔,终止反应。
2.2.11)数据采集:采用酶标仪,读取OD450吸光值。
3.实验结果与分析
ELISA结果表1所示,抗体HFab20/LFab20可与抗原NCOV-SARI-N-his2和019-NCOVNucleocapsid有结合,EC50分别为4.752μg/mL和3.975μg/mL。
表1.Fab20与新型冠状病毒2019-nCoV N蛋白结合的EC50值
3.生物膜干涉(Biolayer Interferometry Technology)方法检测Fab 20抗体对SARS-CoV-2的N蛋白亲和力
利用Fortebio BLItz仪器检测Fab 20抗体对SARS-CoV-2的N蛋白抗原的亲和动力学常数。
3.1用0.1%BSA+0.05%Tween 20的PBS(pH 7.2)溶解,配制获得1×KB buffer。
3.2 Fab20抗体用1×KB buffer配制成5μg/mL。
3.3 2019-NCOV Nucleocapsid(原核表达N蛋白)用1×KB缓冲液2倍比分别稀释成8000,4000,2000nmol/L。
3.4打开Fortebio仪器及相关软件,选择Advanced Kientics实验模式。
3.5分析程序按下述表2设置。
表2.Fortebio BLItz运行方法
3.6实验结果
通过Global拟合模式下Fab 20和抗原N protein的结合解离曲线,得到Fab 20抗体与抗原N protein的KD值为111nM,如下述表3所示。
表3.Global拟合模式亲和动力学检测结果
序列表
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Thr Gln Ala
Claims (4)
1.一种抗新型冠状病毒N蛋白的中和抗体,它由轻链和重链组成,其特征是,所述轻链可变区的氨基酸序列如SEQ ID NO:1所示,所述重链可变区的氨基酸序列如SEQ ID NO:2所示。
2.根据权利要求1所述的抗新型冠状病毒N蛋白的中和抗体,其特征是,所述抗体轻链的氨基酸序列如SEQ ID NO:3所示,重链的氨基酸序列如SEQ ID NO:4所示。
3.权利要求1所述抗体在制备诊断新型冠状病毒的试剂,或者是在制备治疗新型冠状病毒的药物中的应用。
4.诊断和/或治疗和/或预防新型冠状病毒所致疾病的产品,其特征是,所述产品中的活性成分为权利要求1所述抗体。
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