CN113214367A - 一种covid-19冠状病毒重组s1蛋白及其应用 - Google Patents

一种covid-19冠状病毒重组s1蛋白及其应用 Download PDF

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CN113214367A
CN113214367A CN202110425619.7A CN202110425619A CN113214367A CN 113214367 A CN113214367 A CN 113214367A CN 202110425619 A CN202110425619 A CN 202110425619A CN 113214367 A CN113214367 A CN 113214367A
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孙乐
孙宇鸿
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Abstract

本发明提供了一种COVID‑19冠状病毒S1重组蛋白及其应用,所述重组蛋白的氨基酸序列如SEQ ID NO.2或3所示。本发明还提供了COVID‑19冠状病毒S1重组蛋白的制备方法,该方法能提高S1重组蛋白在真核细胞中表达量,达到55‑70mg/L。本发明的S1重组蛋白与感染了COVID‑19病毒的病人血清或接种了COVID‑19疫苗的动物血清均有交叉反应,可用于制备多克隆抗体和单克隆抗体、开发抗体或抗原的诊断试剂以及设计和筛选COVID‑19冠状病毒治疗药物。S1‑Fc融合蛋白免疫动物后产生的抗体识别COVID‑19冠状病毒,可用于制备冠状病毒疫苗,市场价值巨大。

Description

一种COVID-19冠状病毒重组S1蛋白及其应用
技术领域
本发明涉及治疗或重组蛋白的制备及应用领域,主要是涉及一种 COVID-19冠状病毒重组S1蛋白及其应用。
背景技术
2019新型冠状病毒肺炎(COVID-19),因2019年病毒性肺炎病例而被发现,2020年1月12日被世界卫生组织命名。冠状病毒是一个大型病毒家族,已知可引起感冒以及中东呼吸综合征(MERS)和严重急性呼吸综合征 (SARS)等较严重疾病。新型冠状病毒是以前从未在人体中发现的冠状病毒新毒株,人感染了冠状病毒后常见体征有呼吸道症状、发热、咳嗽、气促和呼吸困难等。在较严重病例中,感染可导致肺炎、严重急性呼吸综合征、肾衰竭,甚至死亡。
目前对于新型冠状病毒所致疾病没有特异治疗方法。但许多症状是可以处理的,因此需根据患者临床情况进行治疗。此外,对感染者的辅助护理比较有效。研制针对该病毒的特异性抗体,有助于新型冠状病毒所引起肺炎的诊断和治疗。
发明内容
本发明的第一个目的在于提供COVID-19冠状病毒重组S1蛋白及其应用。
本发明的另一个目的在于提供该重组S1蛋白的制备方法。
本发明提供的COVID-19冠状病毒重组S1蛋白,包括重组S1-His标签蛋白、和/或重组S1-Fc融合蛋白,所述重组S1-His标签蛋白的氨基酸序列如SEQ ID NO.2所示,所述重组S1-Fc融合蛋白的氨基酸序列如SEQ ID NO. 3所示。
本发明提供了所述COVID-19冠状病毒重组S1蛋白的以下任一种应用,
(1)在制备COVID-19冠状病毒疫苗中的应用;
(2)在制备COVID-19冠状病毒诊断试剂或试剂盒中的应用;
(3)在制备COVID-19冠状病毒多克隆抗体或单克隆抗体中的应用;
(4)在制备预防或治疗COVID-19冠状病毒引起疾病的药物中的应用;
(5)在制备抑制或杀灭COVID-19冠状病毒的药物中的应用;
(6)在制备COVID-19冠状病毒高免血清中的应用;
(7)在筛选COVID-19冠状病毒治疗药物中的应用;
(8)在COVID-19冠状病毒疫苗质量检测中的应用;
(9)在检测COVID-19冠状病毒中的应用;
(10)在预防或治疗COVID-19冠状病毒引起疾病中的应用。
上述应用中,优选地,所述诊断试剂为抗体诊断试剂或抗原诊断试剂。
本发明提供了含有所述COVID-19冠状病毒重组S1蛋白S1-His标签蛋白、和/或重组S1-Fc融合蛋白的产品,所述产品为以下任一:
(1)预防或治疗COVID-19冠状病毒的疫苗;
(2)预防或治疗COVID-19冠状病毒的药物;
(3)预防或治疗COVID-19冠状病毒的诊断试剂或试剂盒;
(4)高免血清;
(5)融合蛋白。
本发明提供了所述COVID-19冠状病毒重组S1蛋白的制备方法,用人 IgG的信号肽去替代COVID-19冠状病毒S1蛋白的信号肽。
优选地,是用人IgG重链蛋白的信号肽去替代COVID-19冠状病毒S1 蛋白的信号肽。
所述SARS-CoV2病毒S1-His蛋白的氨基酸序列如SEQ ID NO.2所示, 所述SARS-CoV2病毒S1-Fc融合蛋白的氨基酸序列如SEQ ID NO.3所示。
人IgG重链蛋白的信号肽的氨基酸序列如SEQ ID NO.4所示。
本发明的有益效果在于:本发明提供的COVID-19冠状病毒S1重组蛋白的制备方法,该方法通过改变新冠S蛋白的信号肽为人抗体重链的信号肽从而提高S1重组蛋白在真核细胞中表达量,达到55-70mg/L以上,本发明解决了新冠病毒重组S1蛋白在真核细胞中表达量低、分泌差的国际难题。本发明的S1重组蛋白与感染了COVID-19病毒的病人血清或接种了COVID-19 疫苗的动物血清均有交叉反应,可用于制备多克隆抗体和单克隆抗体、开发抗体或抗原的诊断试剂以及设计和筛选COVID-19冠状病毒治疗药物,具有良好的应用前景。新冠病毒重组S1-Fc融合蛋白免疫小鼠或猴子后很快产生特异识别新冠病毒S1蛋白的抗体,并且可以中和S1蛋白和它的受体 ACE-2蛋白的结合,可以用于新冠病毒疫苗开发,市场价值巨大。
附图说明
图1为S1-His及S1-Fc重组蛋白的SDS-PAGE结果图。A:SARS-CoV-2 重组S1-Fc蛋白SDS-PAGE示意图;B:SARS-CoV-2重组S1-His蛋白 SDS-PAGE示意图。泳道1为Marker,泳道2为重组蛋白。
图2为重组S1-Fc蛋白免疫小鼠血清滴度ELISA检测结果。
图3为重组S1-Fc蛋白免疫兔血清滴度ELISA检测结果。
图4为重组S1-Fc蛋白免疫猕猴血清中IgG和IgM水平ELISA检测图。
图5为基于新冠S1蛋白抗体检测试剂盒的血清学检测结果图。
图6新冠S1蛋白抗体IgG+IgM金标试纸条的疫苗有效性评价结果图。
图7S1-Fc免疫兔和猴抗血清对假病毒的中和作用比较图,A:用 SARS-CoV-2假病毒测定兔血清的中和活性。B:用SARS-CoV-2假病毒测定猴血清的中和活性。横坐标为血清稀释度,纵坐标为中和率。
图8为新冠疫苗定量检测试剂盒标准曲线。
具体实施方式
缩写和定义
“抗体”,是指表现所需生物学活性(例如抑制配体与其受体的结合或通过抑制配体诱导的受体信号传递)的抗体的任何形式。因此,所述抗体以最广泛的意义使用,并明确包括但不限于单克隆抗体、多克隆抗体和多特异性抗体。
“Fc”区域为含有抗体的CH1和CH2结构域的两个重链片段。两个重链片段由两个或多个二硫键并通过CH3结构域的疏水作用保持在一起。
本申请所用术语“单克隆抗体”是指从基本上同种抗体群中获得的抗体,即除了可能少量存在的可能的天然突变体外,构成所述群的各个抗体是一致的。单克隆抗体具有高度特异性,可针对单个的抗原位点。此外,与通常包括针对多个不同的决定簇(表位)的多种不同抗体的常规(多克隆)抗体制备物相反,每种单克隆抗体仅针对抗原上的单个决定簇。修饰语“单克隆”表示从基本上同种抗体群获得的抗体的特性,不能理解为需要通过任何特定方法来制备所述抗体。
本文所用“抑制”或“治疗(treat或treatment)”包括延缓与疾病有关的症状的发展和/或减轻所述疾病将要或预期发展的这些症状的严重程度。所述术语还包括减缓已有症状、防止另外的症状和减缓或防止这些症状的潜在原因。
通过参考以下实施例将更充分地理解本发明。然而,这些实施例不应该理解为限制本发明范围。
若未特别指明,实施例中所用的技术手段为本领域技术人员所熟知的常规手段。下述实施例中所用的材料、试剂等,如无特殊说明,均可从商业途径得到。
实施例1重组S1蛋白的制备方法
用人IgG1重链的信号肽(SEQ ID NO.4)与SARS-CoV2病毒S1蛋白 (SEQ ID NO.1)连接并插入到哺乳动物细胞表达载体,获得重组质粒,用其转染哺乳动物细胞,在细胞上清液中分泌出高浓度的病毒重组S1蛋白。重组S1-His标签蛋白的氨基酸序列如SEQ ID NO.2所示,所述重组S1-Fc 融合蛋白的氨基酸序列如SEQ ID NO.3所示。
在293和CHO真核细胞中实现了新冠病毒重组S1-His蛋白和S1-Fc 的高表达。
本发明解决了新冠病毒S1重组蛋白在哺乳细胞中表达后穿细胞膜困难、表达量太低的世界技术难题,瞬转293和CHO细胞上清液中新冠病毒重组 S1-His和S1-Fc融合蛋白表达量分别高达71.7mg/L和55.9mg/L,可以商业化量产。
实施例2重组S1蛋白诱导动物体内产生抗S1抗体
用本发明获得的S1-Fc重组蛋白(氨基酸序列如SEQ ID NO.2所示) 免疫动物,所述动物包括4周龄雌性BALB/c小鼠、12~15周龄雌性新西兰大耳白兔和3~4岁猕猴。简单地说,4周龄雌性BALB/c小鼠用重组S1-Fc 蛋白配合AD20Gold+佐剂免疫(第0、3、7天肌肉注射9.2μg,第9天和第 11天降低到0.575μg)。使用重组S1-Fc蛋白配合AD20Gold+佐剂免疫12~15周龄雌性新西兰大耳白兔(第0、4、7天肌肉注射100μg,第11、14、18 天肌肉注射50μg)。3~4岁猕猴使用重组S1-Fc蛋白配合弗氏完全佐剂启动第一次免疫,并使用重组S1-Fc蛋白配合AD11.10佐剂(该佐剂购自苏州艾迪维信)进行多次加强免疫(第0天使用CFA皮下注射250μg,第4 天、9天、22天和26天使用AD11.10肌肉注射250μg)。采集不同时间点的血液样本,测定抗体水平和中和效价。
对重组S1-Fc蛋白免疫的4周龄雌性BALB/c小鼠在第38天采集血清,用酶标山羊抗小鼠IgG Fc特异性二抗ELISA检测。如图2所示,所有的5 只小鼠都产生了很强的抗S1的IgG抗体(滴度为64,000~256,000)。
对重组S1-Fc蛋白免疫的2只兔子在第27天采集血清进行抗S1抗体滴度检测。与在小鼠中观察到的情况类似,S1-Fc免疫兔对S1蛋白也产生了非常高的结合效价(滴度为100,000或更高)(见图3)。
对重组S1-Fc蛋白免疫的猴子在多个时间多次采集血清进行抗S1蛋白 IgG及IgM亚型抗体的滴度检测。如图4所示,第8天雌性猕猴体内仅检出抗S1蛋白IgG抗体。第15天,在两只猕猴中均检测到较强的抗S1蛋白IgG滴度,IgM水平也可检测到。但在第22天再次使用重组S1-Fc蛋白加强免疫后,anti-S1 IgG滴度仅在第32天大幅升高,而anti-S1 IgM滴度未见明显升高。
实施例3基于重组S1蛋白的抗新冠S1蛋白抗体检测试剂盒开发及其应用
新冠抗S1蛋白抗体检测试剂盒包被板制备方法如下:使用配置于磷酸盐缓冲液(10mM PBS,pH 7.4)中的浓度为1μg/mL的重组SARS-CoV-2 S1-His蛋白进行包被,将100μL的溶液加入96孔ELISA板中,2℃-8℃孵育过夜。并使用3%牛血清白蛋白(BSA)PBS封闭未被重组S1-His蛋白占据的空间,室温孵育1小时后,对包被板进行风干和密封处理备用。
在ELISA试剂盒使用过程中,每个血清样本复孔检测。检测前,人样或标准品在样品稀释缓冲液中以1:20稀释。然后取100μL适当稀释的样品加入S1-6×His包被板的每孔中,37℃振荡孵育0.5小时。每孔加入适量稀释的辣根过氧化物酶结合山羊抗人IgG(H+L)二抗100μL,37℃振荡孵育15 分钟。在加入TMB基质溶液前,使用洗涤缓冲液冲洗5次。避光孵育5-10 分钟后,用0.1M硫酸终止显色并在450nm波长下用microplate分光光度计(ThermoScientific,Multiskan MK3)测量OD读值。
ELISA试剂盒被送往几家医院,以检测其对真实临床样本的敏感性。部分数据见图5。一个研究组包括45个不同临床阶段COVID-19确诊患者的临床样本。如图5的A图所示,45份样本中,SARS-CoV-2抗体阳性44 份,敏感性为97.8%。1周内采集标本21份(第1天1例;第3天3例;第4 天和第5天各7例;第6天2例;第7天1例)COVID-19发病;所有人的 SARS-CoV-2抗体检测均呈阳性。且不同性别和年龄的抗体水平无显著差异 (图5B和5C)。
第1组患者按发病天数(图5的A图)、性别(图5的B图)、年龄图5的 (图5的C图)进行分类。第2组患者(图5的D图)按入院日、住院期间、出院后第14天进行分类。
在另一组研究中,如图5的D图所示,24个临床样本中有23个检测出SARS-CoV-2抗体阳性。按采集次数分类:(1)入院日;(2)住院期间的任何时间;出院后第14天随访。显然,刚到医院的患者的SARS-CoV-2抗体水平是最低的。患者在治疗期间和出院后抗体水平升高。
实施例4基于重组S1蛋白的新冠S1蛋白抗体IgG+IgM金标试纸条开发及其应用
使用重组S1蛋白进行了新冠S1蛋白抗体IgG+IgM金标试纸条的开发,并用该试纸条对接种新冠疫苗后的个体的血清中的抗S1蛋白的IgG及IgM 的抗体进行检测,如图6所示。其中大部分年轻人在接种完新冠疫苗后第14天内均产生了新冠S1抗体IgG,中年人则在20天左右可以测到。但是,仍然有2人检测不到,说明没有产生足够的新冠S1抗体,免疫效果不理想。
实施例5重组S1蛋白诱导动物体内产生保护性中和抗体
复旦大学金侠教授团队使用SARS-CoV-2假病毒检测了S1-Fc免疫兔或猕猴血清的中和活性。简单地说,热灭活血清样品与200TCID50假病毒在 37℃下预孵育1h。混合物然后被用来感染ACE2-293 T细胞。3天后测定感染细胞的荧光素酶活性。如表1和图7的A图所示,用SARS-CoV-2S1-Fc 融合蛋白(氨基酸序列SEQ ID NO.3),在免疫后第27天,两只兔均有很高的中和活性,IC50效价>3000,IC90效价分别为501和440。如图7的B 图所示,2只S1-Fc免疫的猕猴在第32天的血清中也观察到极好的中和效价(见表1)。
表1 S1-Fc免疫猴和兔血清的假病毒中和效价
Figure RE-GDA0003139017210000071
数据清楚地表明,本发明表达获得的SARS-CoV-2S1-Fc融合蛋白可以在很短的时间内诱导对SARS-CoV-2很强的中和作用,是COVID-19疫苗开发的一个很好的候选蛋白。
综上所述,获得的新冠病毒重组S1-Fc融合蛋白免疫小鼠、兔子或猴子后均能很快产生特异识别新冠病毒S1蛋白的抗体,并且可以中和S1蛋白和它的受体ACE-2蛋白的结合,可以用于新冠病毒疫苗开发。
实施例6 S1特异鼠单抗配对的新冠疫苗定量试剂盒开发及应用
采用双抗体夹心法(夹心Elisa)原理。96孔板涂有抗SARS-CoV-2S1蛋白多克隆抗体(用S1-Fc免疫新西兰白兔获得)。加入样品后,把游离抗体洗涤取出后。然后将HRP标记的抗SARS-CoV-2S1蛋白抗体添加到平板上,形成包被的抗体-抗原-HRP标记的抗体复合物。通过TMB显色程度检测灭活SARS-CoV-2的含量。
新冠疫苗定量试剂盒包被板制备方法如下:使用配置于碳酸钠-碳酸氢钠缓冲液(pH 9.6)中的浓度为2μg/mL的抗S1蛋白兔多抗进行包被,将 100μL的溶液加入96孔ELISA板中,2℃-8℃孵育过夜。用PBS洗涤2次后,并使用20%小牛血清(calf serum)封闭未被占据的空间,室温孵育1.5小时后,对包被板进行风干和密封处理备用。
新冠疫苗定量检测试剂盒使用S1-His蛋白作为标准品(标准曲线如图 8所示)。该试剂盒可定量检出检测样本中的S1组分,灵敏度可达100ng/mL。
序列表
<110> 北京派迪畅科技发展有限公司
<120> 一种COVID-19冠状病毒重组S1蛋白及其应用
<130> KHP201110733.8
<150> 2020103133725
<151> 2020-04-20
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Claims (9)

1.一种COVID-19冠状病毒重组S1蛋白,其特征在于,其氨基酸序列如SEQ ID NO.1,SEQID NO.2或SEQ ID NO.3所示。
2.权利要求1所述COVID-19冠状病毒重组S1蛋白的以下任一种应用,
(1)在制备COVID-19冠状病毒疫苗中的应用;
(2)在制备COVID-19冠状病毒诊断试剂或试剂盒中的应用;
(3)在制备COVID-19冠状病毒多克隆抗体或单克隆抗体中的应用;
(4)在制备预防或治疗COVID-19冠状病毒引起疾病的药物中的应用;
(5)在制备抑制或杀灭COVID-19冠状病毒的药物中的应用;
(6)在制备COVID-19冠状病毒高免血清中的应用;
(7)在筛选COVID-19冠状病毒治疗药物中的应用;
(8)在COVID-19冠状病毒疫苗质量检测中的应用;
(9)在检测COVID-19冠状病毒中的应用;
(10)在预防或治疗COVID-19冠状病毒引起疾病中的应用。
3.根据权利要求2所述的应用,其特征在于,所述诊断试剂为抗体诊断试剂或抗原诊断试剂。
4.含有权利要求1所述COVID-19冠状病毒重组S1蛋白的产品,所述产品为以下任一:
(1)预防或治疗COVID-19冠状病毒的疫苗;
(2)预防或治疗COVID-19冠状病毒的药物;
(3)预防或治疗COVID-19冠状病毒的诊断试剂或试剂盒;
(4)高免血清;
(5)融合蛋白。
5.权利要求1所述COVID-19冠状病毒重组S1蛋白的制备方法,其特征在于,用人IgG的信号肽去替代COVID-19冠状病毒S1蛋白的信号肽。
6.根据权利要求5所述的制备方法,其特征在于,用人IgG重链蛋白的信号肽去替代COVID-19冠状病毒S1蛋白的信号肽。
7.以权利要求1所述的COVID-19冠状病毒重组S1蛋白为免疫原,制得的单克隆抗体。
8.以权利要求1所述的COVID-19冠状病毒重组S1蛋白为免疫原,制得的多克隆抗体。
9.一种提高S1重组蛋白在真核细胞中表达量的方法,其特征在于,人IgG1重链的信号肽与SARS-CoV2病毒S1蛋白连接并插入到哺乳动物细胞表达载体,获得重组质粒,用其转染哺乳动物细胞,在细胞上清液中获得高浓度的病毒重组S1蛋白;所述人IgG1重链的信号肽序列如SEQ ID NO.4所示,所述SARS-CoV2病毒S1蛋白的氨基酸序列如SEQ ID NO.1所示。
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