CN114163520B - 一种血源性人IgM抗体纯化介质制备方法 - Google Patents
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- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/06—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies from serum
- C07K16/065—Purification, fragmentation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/42—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins
- C07K16/4283—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against immunoglobulins against an allotypic or isotypic determinant on Ig
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Abstract
本发明公开了一种血源性人IgM抗体纯化介质制备方法,将一株能与人源IgM抗体特异性结合的二抗AT2910(anti‑μ链)通过CNBr偶联与琼脂糖介质偶联,获得IgM抗体纯化介质;本发明方法简单,易生产放大,方便大规模血清中生产人源IgM;本发明对人源IgM抗体的结构影响小,分离纯化得到的人源IgM抗体纯度高,特异性强,作为较好的免疫原使用;本发明可用于羊抗人IgM血清或兔抗人IgM血清的大规模制备,满足抗原供应。
Description
技术领域
本发明属于生物技术领域,特别涉及一种血源性人IgM抗体纯化介质制备方法。
背景技术
现有方法多采用PEG沉淀法或硫酸铵(SAS)沉淀法,此外再通过凝胶过滤层析技术(Gel filtration chromatography)、离子交换层析(Ion-exchange columnchromatography,IEC)。
现有方法较为复杂,步骤较多,分离纯化得到的人源IgM抗体纯度不高,作为最终产品或免疫原使用的话易对实验造成交差反应,且对人源IgM抗体的结构有一定的破坏,此外该方法得率不高,不利于大规模生产。
本发明方法简单,易生产放大,对人源IgM抗体的结构影响小,分离纯化得到的人源IgM抗体纯度高,作为较好的免疫原使用。
发明内容
本发明提供了一种血源性人IgM抗体纯化介质制备方法,以解决现有技术中的问题。
为了实现上述目的,本发明采用以下技术方案:
一种血源性人IgM抗体纯化介质制备方法,将一株能与人源IgM抗体μ链特异性结合的二抗AT2910通过CNBr偶联与琼脂糖介质偶联,获得IgM抗体纯化介质。
进一步的,具体的制备方法,包括以下步骤:
S1、使用偶联缓冲液对AT2910蛋白进行透析置换缓冲液,按照体积比为1:40透析两次,A280测蛋白浓度;
S2、琼脂糖CNBr冻干粉(GE Health Care)﹕AT2910=1ml﹕4mg(V/W)的比例称取相应质量的琼脂糖冻干粉,1g冻干粉对应3.5ml的成品琼脂糖凝胶柱体积;
S3、按照每g冻干粉对应20mL 1mM HCl将琼脂糖冻干粉重悬后,放置4℃活化2h;
S4、用1mM HCl将活化好的琼脂糖CNBr冲洗至少10分钟,再用去离子水冲洗将HCl完全置换,然后使用偶联缓冲液平衡;
S5、将平衡好的琼脂糖CNBr和透析好的AT2910蛋白按照所述步骤2的比例于4℃条件下在旋转混合仪上充分混合3h进行偶联;
S6、将偶联后的柱料填充到层析柱内,使用5倍柱体积的偶联缓冲液漂洗;
S7、将柱料转移到0.01M的Tris-HCl缓冲液中终止偶联反应2h;
S8、使用至少5倍柱料体积的0.1M醋酸钠或醋酸缓冲液和0.01M Tris-HCl缓冲液交替漂洗,至少循环3次;
S9、将最终获得的IgM抗体纯化介质保存在0.01M PBS,含0.02%NaN3(w/v)中,保存于4℃。
进一步的,所述偶联缓冲液包括0.1M NaHCO3和0.3M NaCl,所述偶联缓冲液pH=7.4。
进一步的,所述Tris-HCl缓冲液的pH=8.0。
进一步的,所述醋酸钠的pH=4.0,所述醋酸缓冲液的pH=4.0。
进一步的,所述PBS的pH=7.4。
与人源IgM抗体特异性结合的二抗AT2910的重链可变区的CDR1,CDR2,CDR3的序列如SEQ ID NO:1,SEQ ID NO:2,SEQ ID NO:3所示。
与人源IgM抗体特异性结合的二抗AT2910的轻链可变区的CDR1,CDR2,CDR3的序列如SEQ ID NO:4,SEQ ID NO:5,SEQ ID NO:6所示。
与现有技术相比,本发明具有以下有益效果:
本发明方法简单,易生产放大,方便大规模血清中生产人源IgM;
本发明对人源IgM抗体的结构影响小,分离纯化得到的人源IgM抗体纯度高,特异性强,作为较好的免疫原使用;
本发明可用于羊抗人IgM血清或兔抗人IgM血清的大规模制备,满足抗原供应。
实施方式
下面结合实施例对本发明作更进一步的说明。
实施例1
一种血源性人IgM抗体纯化介质制备方法,将一株能与人源IgM抗体μ链特异性结合的二抗AT2910通过CNBr偶联与琼脂糖介质偶联,获得IgM抗体纯化介质。
所述质制备方法,包括以下步骤:
S1、使用偶联缓冲液(0.1M NaHCO3+0.3M NaCl,pH=7.4)对AT2910蛋白进行透析置换缓冲液,按照体积比为1:40透析两次,A280测蛋白浓度;
S2、琼脂糖CNBr冻干粉(GE Health Care)﹕AT2910=1ml﹕4mg(V/W)的比例称取相应质量的琼脂糖冻干粉,1g冻干粉对应3.5ml的成品琼脂糖凝胶柱体积;
S3、按照每g冻干粉对应20mL 1mM HCl将琼脂糖冻干粉重悬后,放置4℃活化2h;
S4、用1mM HCl将活化好的琼脂糖CNBr冲洗至少10分钟,再用去离子水冲洗将HCl完全置换,然后使用偶联缓冲液平衡;
S5、将平衡好的琼脂糖CNBr和透析好的AT2910蛋白按照所述步骤2的比例于4℃条件下在旋转混合仪上充分混合3h进行偶联;
S6、将偶联后的柱料填充到层析柱内,使用5倍柱体积的偶联缓冲液漂洗;
S7、将柱料转移到0.01M的Tris-HCl缓冲液(pH 8.0)中终止偶联反应2h;
S8、使用至少5倍柱料体积的0.1M醋酸钠或醋酸缓冲液(pH 4.0)和0.01M Tris-HCl缓冲液(pH 8.0)交替漂洗,至少循环3次;
S9、将最终获得的IgM抗体纯化介质保存在0.01M PBS(pH 7.4),含0.02%NaN3(w/v)中,保存于4℃。
实施例2
AT2910为通过杂交瘤细胞融合技术获得的一株单克隆抗体,可以特异性结合人IgM-μ链,其轻重链CDR区核苷酸序列通过细胞株测序获得,AT2910的制备过程如下:
1、腹水处理:500mL AT2910腹水在25℃或室温条件下用10微米孔径慢速滤纸过滤去除油脂、沉淀杂蛋白、组织碎片等固体不容物;
2、柱平衡:使用柱体积为100mL的Protein G层析柱,用平衡缓冲液(0.02mM Tris+0.2M NaCl,pH=7.4)平衡5倍柱体积,柱平衡好后将蛋白紫外检测仪显示值A280值调整为
0,作为基线;
3、上样:用1000mL体积的平衡缓冲液(0.02mM Tris+0.2M NaCl,pH=7.4)稀释腹水,稀释后的腹水作为样品上样,使用蠕动泵在20-25℃条件下上样,流速为10mL/min;
4、平衡:上样完成后再用1000mL的平衡液(0.02mM Tris+0.2M NaCl,pH=7.4)平衡Protein G柱,平衡至无蛋白流出,即蛋白紫外检测值A280显示值为0,流速为20mL/min;
5、解离:平衡完成后使用解离液(0.1M甘氨酸,pH=3)进行解离,当蛋白紫外检测仪显示值大于0.3时开始收集蛋白,当蛋白紫外检测仪显示值小于0.3时停止收集蛋白,收集管中预先加入0.1倍收集体积的2M Tris(pH8.0),流速为10mL/min;
6、平衡:解离完成后继续用解离液(0.1M甘氨酸,pH=3)洗涤柱至无蛋白流出,再用去离子水平衡柱约5-10倍柱体积,最终用20%的乙醇保存ProteinG柱;
7、透析:合并收集蛋白组分,使用偶联缓冲液(0.1M NaHCO3+0.3M NaCl,pH=7.4)对AT2910蛋白进行透析置换缓冲液,按照体积比为1:40透析两次,透析间隔不低于4小时。
与人源IgM抗体特异性结合的二抗AT2910的重链可变区的CDR1,CDR2,CDR3的序列如SEQ ID NO:1,SEQ ID NO:2,SEQ ID NO:3所示。
与人源IgM抗体特异性结合的二抗AT2910的轻链可变区的CDR1,CDR2,CDR3的序列如SEQ ID NO:4,SEQ ID NO:5,SEQ ID NO:6所示。
重链CDR1的序列SEQID NO:1:FTYTMFMS;
重链CDR2的序列SEQID NO:2:VLNADSTRY;
重链CDR3的序列SEQID NO:3:SAVDTTY;
轻链CDR1的序列SEQID NO:4:SSRDWKY;
轻链CDR2的序列SEQID NO:5:SDNPLR;
轻链CDR3的序列SEQID NO:6:QGDTWTNS。
与人源IgM抗体特异性结合的二抗AT2910的核心序列:
H-chain:CDR1(-Phe-Thr-Tyr-Thr-Met-Phe-Met-Ser-),
CDR2(-Val-Leu-Asn-Ala-Asp-Ser-Thr-Arg-Tyr-),
CDR3(-Ser-Ala-Val-Asp-Thr-Thr-Tyr-)
L-chain:CDR1(-Ser-Ser-Arg-Asp-Trp-Lys-Tyr-),CDR2(-Ser-Asp-Asn-Pro-Leu-Arg-),
CDR3(-Gln-Gly-Asp-Thr-Trp-Thr-Asn-Ser-)
H-chain:CDR1(ttt-acc-tat-acc-atg-ttt-atg-agc),
CDR2(gtg-ctg-aac-gcg-gat-agc-acc-cgt-tat),
CDR3(agc-gcg-gtg-gat-acc-acc-tat)
L-chain:CDR1(agc-agc-cgt-gat-tgg-aaa-tat),
CDR2(agc-gat-aac-ccg-ctg-cgt),
CDR3(cag-ggc-gat-acc-tgg-acc-aac-agc)
对于抗体来说CDR序列为核心,除此之外其他序列不重要,但依然附完整序列:
>H-chain:
QVQLQESGPELVKPGASLSLTCIASFTYTMFMSIEWMRQFPGKSLEWIGNVLNADSTRYYNEKFKGKAKLTVKESASTVYLEFSRLTSDESAVYYCAIHSAVDTTYDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK
>L-chain
DIVLTQSPASLAVSLGQRATRATISASQGSSRDWKYFMNWYQQKAGQPPKLLISDNPLRESGIPVRFSGRGSGTDFTINIHPVEEEDVATYYCQQGDTWTNSFGAGTKLELKRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRNucleotide sequence:
>H-chain:
caggtgcagctgcaggaaagcggcccggaactggtgaaaccgggcgcgagcctgagcctgacctgcattgcgagctttacctataccatgtttatgagcattgaatggatgcgtcagtttccgggcaaaagcctggaatggattggcaacgtgctgaacgcggatagcacccgttattataacgaaaaatttaaaggcaaagcgaaactgaccgtgaaagaaagcgcgagcaccgtgtatctggaatttagccgtctgaccagcgatgaaagcgcggtgtattattgcgcgattcatagcgcggtggataccacctatgattattggggccagggcaccagcgtgaccgtgagcagcgcgaaaaccaccccgccgagcgtgtatccgctggcgccgggcagcgcggcgcagaccaacagcatggtgaccctgggctgcctggtgaaaggctattttccggaaccggtgaccgtgacctggaacagcggcagcctgagcagcggcgtgcatacctttccggcggtgctgcagagcgatctgtataccctgagcagcagcgtgaccgtgccgagcagcacctggccgagcgaaaccgtgacctgcaacgtggcgcatccggcgagcagcaccaaagtggataaaaaaattgtgccgcgtgattgcggctgcaaaccgtgcatttgcaccgtgccggaagtgagcagcgtgtttatttttccgccgaaaccgaaagatgtgctgaccattaccctgaccccgaaagtgacctgcgtggtggtggatattagcaaagatgatccggaagtgcagtttagctggtttgtggatgatgtggaagtgcataccgcgcagacccagccgcgtgaagaacagtttaacagcacctttcgtagcgtgagcgaactgccgattatgcatcaggattggctgaacggcaaagaatttaaatgccgtgtgaacagcgcggcgtttccggcgccgattgaaaaaaccattagcaaaaccaaaggccgtccgaaagcgccgcaggtgtataccattccgccgccgaaagaacagatggcgaaagataaagtgagcctgacctgcatgattaccgatttttttccggaagatattaccgtggaatggcagtggaacggccagccggcggaaaactataaaaacacccagccgattatggataccgatggcagctattttgtgtatagcaaactgaacgtgcagaaaagcaactgggaagcgggcaacacctttacctgcagcgtgctgcatgaaggcctgcataaccatcataccgaaaaaagcctgagccatagcccgggcaaa
>L-chain:
Gatattgtgctgacccagagcccggcgagcctggcggtgagcctgggccagcgtgcgacccgtgcgaccattagcgcgagccagggcagcagccgtgattggaaatattttatgaactggtatcagcagaaagcgggccagccgccgaaactgctgattagcgataacccgctgcgtgaaagcggcattccggtgcgttttagcggccgtggcagcggcaccgattttaccattaacattcatccggtggaagaagaagatgtggcgacctattattgccagcagggcgatacctggaccaacagctttggcgcgggcaccaaactggaactgaaacgtgcggatgcggcgccgaccgtgagcatttttccgccgagcagcgaacagctgaccagcggcggcgcgagcgtggtgtgctttctgaacaacttttatccgaaagatattaacgtgaaatggaaaattgatggcagcgaacgtcagaacggcgtgctgaacagctggaccgatcaggatagcaaagatagcacctatagcatgagcagcaccctgaccctgaccaaagatgaatatgaacgtcataacagctatacctgcgaagcgacccataaaaccagcaccagcccgattgtgaaaagctttaaccgt。
以上所述仅是本发明的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
SEQUENCE LISTING
<110> 南京京达生物技术有限公司
<120> 一种血源性人IgM抗体纯化介质制备方法
<130>
<160> 6
<170> PatentIn version 3.3
<210> 1
<211> 8
<212> PRT
<213> 人工序列
<400> 1
Phe Thr Tyr Thr Met Phe Met Ser
1 5
<210> 2
<211> 9
<212> PRT
<213> 人工序列
<400> 2
Val Leu Asn Ala Asp Ser Thr Arg Tyr
1 5
<210> 3
<211> 7
<212> PRT
<213> 人工序列
<400> 3
Ser Ala Val Asp Thr Thr Tyr
1 5
<210> 4
<211> 7
<212> PRT
<213> 人工序列
<400> 4
Ser Ser Arg Asp Trp Lys Tyr
1 5
<210> 5
<211> 6
<212> PRT
<213> 人工序列
<400> 5
Ser Asp Asn Pro Leu Arg
1 5
<210> 6
<211> 8
<212> PRT
<213> 人工序列
<400> 6
Gln Gly Asp Thr Trp Thr Asn Ser
1 5
Claims (3)
1.一种血源性人IgM抗体纯化介质制备方法,其特征在于,将与人源IgM抗体μ链特异性结合的二抗AT2910通过CNBr与琼脂糖介质偶联,获得IgM抗体纯化介质;
所述二抗AT2910的重链可变区的CDR1,CDR2,CDR3的序列分别如SEQ ID NO:1,SEQ IDNO:2,SEQ ID NO:3所示;
轻链可变区的CDR1,CDR2,CDR3的序列分别如SEQ ID NO:4,SEQ ID NO:5,SEQ ID NO:6所示。
2.根据权利要求1所述的一种血源性人IgM抗体纯化介质制备方法,其特征在于,包括以下步骤:S1、使用偶联缓冲液对AT2910蛋白进行透析置换缓冲液,按照体积比为1:40透析两次,A280测蛋白浓度;
S2、琼脂糖CNBr冻干粉﹕AT2910=1ml﹕4mg的比例称取相应质量的琼脂糖冻干粉,1g冻干粉对应3.5ml的成品琼脂糖凝胶柱体积;
S3、按照每g冻干粉对应20mL 1mM HCl将琼脂糖冻干粉重悬后,放置4℃活化2h;
S4、用1mM HCl将活化好的琼脂糖CNBr冲洗至少10分钟,再用去离子水冲洗将HCl完全置换,然后使用偶联缓冲液平衡;
S5、将平衡好的琼脂糖CNBr和透析好的AT2910蛋白按照所述步骤2的比例于4℃条件下在旋转混合仪上充分混合3h进行偶联;
S6、将偶联后的柱料填充到层析柱内,使用5倍柱体积的偶联缓冲液漂洗;
S7、将柱料转移到0.01M的Tris-HCl缓冲液中终止偶联反应2h;
S8、使用至少5倍柱料体积的0.1M醋酸钠或醋酸缓冲液和0.01M Tris-HCl缓冲液交替漂洗,至少循环3次;
S9、将最终获得的IgM抗体纯化介质保存在0.01M PBS,含0.02%NaN3(w/v)中,保存于4℃。
3.根据权利要求2所述的一种血源性人IgM抗体纯化介质制备方法,其特征在于,所述偶联缓冲液包括0.1M NaHCO3和0.3M NaCl,所述偶联缓冲液pH=7.4。
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