CN113351191B - 多齿配体的新型imac色谱介质及其制备方法 - Google Patents
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- B01J20/281—Sorbents specially adapted for preparative, analytical or investigative chromatography
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- B01D15/38—Selective adsorption, e.g. chromatography characterised by the separation mechanism involving specific interaction not covered by one or more of groups B01D15/265 - B01D15/36
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Abstract
本发明提供一种多齿配体的新型IMAC色谱介质,其特征在于:该介质具有如式(1)所示的结构:并公开了其制备方法。本发明的新型IMAC色谱介质,具有更多可与金属离子螯合的螯合齿,进一步增强填料对目的蛋白的选择性,降低固相介质与生物分子的亲和力,从而减少非特异吸附。
Description
技术领域
本发明专利涉及一种多齿配体的新型IMAC色谱介质及其制备方法。
背景技术
固定化金属亲和色谱(IMAC)是通过将特定金属离子(通常为Ni2+、Cu2+、Zn2+或Co2+)固定在固相支持介质上,利用生物分子中某些化学基团进行亲和纯化的技术,技术发展已有较长时间,金属配合物结构逐渐发展,从亚氨基二乙酸(IDA)、氨三乙酸(NTA)、三(羧甲基)乙二胺(TED)到最近的乙二胺四乙酸(EDTA),金属螯合配基数量逐渐上升,带来的效果也是显而易见的,即对纯化体系中常用的螯合剂(如EDTA)和还原剂(如巯基乙醇/DTT)的耐受性逐渐上升,且获得的生物产品纯度也逐渐提高。
中国专利文献CN 109789385 A提供了一种将EDTA通过酰胺键连接至固相支持物的色谱介质,提供了五齿螯合的条件。
发明内容
本发明的目的是提供一种多齿配体的新型IMAC色谱介质,提供可与金属离子螯合的6齿结构,进一步降低了固相介质与生物分子的亲和力,从而减少非特异吸附。
本发明采用的技术方案为:一种多齿配体的新型IMAC色谱介质,其特征在于:该介质具有如式(1)所示的结构:
其中G是固相支持介质;
R1为H,C1-C3烷烃或醇中的一种;
R2为提供额外配体齿的COOH,CONH2或CH2OH中的一种;
n1为2或3;
n2为0-3中任一整数。
优选的,所述固相支持介质为多孔固相支持物或磁性介质。
优选的,所述固相支持介质为琼脂糖、葡聚糖、硅胶或磁珠。
优选的,所述固相支持介质直径为20-200μm,由琼脂糖制成,n1为2,n2为0或1,R1为H,R2为COOH。更优选的直径为45-160μm。
优选的,所述固相支持介质加载有金属离子,所述金属离子为Cu2+、Ni2+、Zn2+、Co2+、Fe3+或Ga3+。更优选的方案为Ni2+。
本发明还公开了上述的多齿配体的新型IMAC色谱介质的制备方法,其特征在于其步骤包括:
(1)活化固相支持介质,在固相支持介质中引入羧基;
(2)活化后的固相支持物与含羧基、酰胺或羟基的分子连接;
(3)步骤(2)的产物通过含酰胺键的缩合剂与含胺多羧酸缩合连接,得到如式(1)所示的介质。
优选的,步骤(2)中含羧基、酰胺或羟基的分子为甘氨酸、α-丙氨酸、β-丙氨酸、乙醇胺、α-丙醇胺、β-丙醇胺、2-氨基乙酰胺、2-氨基丙酰胺或3-氨基丙酰胺的其中一种或任意两种或多种的组合。
优选的,步骤(3)中含胺多羧酸为乙二胺四乙酸或丙二胺四乙酸,使用的缩合剂为EDC或EDCI。
优选的,步骤(1)中的活化在碱性条件下进行,活化剂为环氧氯丙烷,环氧溴丙烷,乙二醇双缩水甘油醚、1,4-丁二醇双缩水甘油醚、1,6-己二醇双缩水甘油醚或聚乙二醇双缩水甘油醚的一种或任意两种或任意多种的组合。
优选的,还包括步骤(4):步骤(3)的产物与金属离子螯合。
本发明的新型IMAC色谱介质,具有更多可与金属离子螯合的螯合齿,进一步增强填料对目的蛋白的选择性,降低固相介质与生物分子的亲和力,从而减少非特异吸附。利用本发明的新型多齿配体色谱介质进行蛋白纯化能够得到高纯度的目的蛋白。
附图说明
图1为大肠杆菌裂解液中His标签重组蛋白A的纯化效果图。M:蛋白Marker。S:蛋白上清。FT:各组流穿。Elution:各组洗脱。con:对照。A-C:实施例1-3制备的纯化介质。
图2为大肠杆菌裂解液中His标签重组T4DNA Ligase的上清及流穿。M:蛋白Marker。S:蛋白上清。con:对照。A-C:实施例1-3制备的纯化介质。
图3为大肠杆菌裂解液中His标签重组T4DNA Ligase的洗涤液。M:蛋白Marker。con:对照。A-C:实施例1-3制备的纯化介质。
图4为大肠杆菌裂解液中His标签重组T4DNA Ligase的洗脱液。M:蛋白Marker。con:对照。A-C:实施例1-3制备的纯化介质。箭头所指蛋白条带为AB介质洗脱组分不含有的非特异吸附的杂蛋白。
下面结合附图对本发明的具体实施方式做进一步说明。
具体实施方式
实施例1
取10ml Sepharose CL-6B,水洗除去乙醇。加入水8ml,环氧氯丙烷1ml,10M NaOH1ml,置于摇床中,40℃活化2h。将活化的凝胶用水洗至中性。加入10ml含0.1M Na2CO3,1M甘氨酸,pH 11的溶液,置于摇床中60℃反应过夜。100ml水洗除去反应液。加入1M EDTA,pH8.0,混匀后加入0.19g EDCI,25℃反应1h,再加入0.19g EDCI,25℃过夜。100ml水洗除去反应液。加入10ml 100mM NiSO4混匀后过滤,50ml水洗,50ml NaCl洗,100ml水洗,保存于10ml20%乙醇中。标记为介质A。
本实施例的反应原理如下:第一步活化
第二步引入羧基
第三步缩合多羧酸
最终得到的介质A的结构式为:
实施例2
取10ml Sepharose CL-6B,水洗除去乙醇。加入水8ml,环氧氯丙烷1.5ml,10MNaOH0.5ml,置于摇床中,30℃活化3h。将活化的凝胶用水洗至中性。加入10ml含0.1MNa2CO3,1Mβ-丙氨酸,pH 9.5的溶液,置于摇床中40℃反应过夜。100ml水洗除去反应液。加入0.5M EDTA,pH 8.0,混匀后加入0.1g EDCI,25℃反应3h,再加入0.1g EDCI,25℃过夜。100ml水洗除去反应液。加入10ml 100mM NiSO4混匀后过滤,50ml水洗,50ml NaCl洗,100ml水洗,保存于10ml 20%乙醇中。标记为介质B,其结构式如下:
实施例3
取10ml Sepharose CL-6B,水洗除去乙醇。加入水8.8ml,环氧氯丙烷0.6ml,10MNaOH0.6ml,置于摇床中,35℃活化4h。将活化的凝胶用水洗至中性。加入10ml 1M乙醇胺,pH10.0的溶液,置于摇床中40℃反应过夜。100ml水洗除去反应液。加入1M EDTA,pH 8.0,混匀后加入0.1g EDCI,25℃反应1h,再加入0.1g EDCI,25℃过夜。100ml水洗除去反应液。加入10ml 100mM NiSO4混匀后过滤,50ml水洗,50ml NaCl洗,100ml水洗,保存于10ml 20%乙醇中。标记为介质C,其结构式如下:
实施例4
取10ml羟基磁珠,100ml水洗。加入水8.8ml,环氧氯丙烷0.6ml,10M NaOH 0.6ml,置于摇床中,40℃活化2h。将活化的磁珠用水洗至中性。加入10ml含0.1M Na2CO3,1M甘氨酸,pH 11的溶液,置于摇床中60℃反应过夜。100ml水洗除去反应液。加入1M EDTA,pH 8.0,混匀后加入0.19g EDCI,25℃反应1h,再加入0.19g EDCI,25℃过夜。100ml水洗除去反应液。加入10ml 100mM NiSO4混匀后过滤,50ml水洗,50ml NaCl洗,100ml水洗,保存于10ml20%乙醇中。其结构式同实施例1。
实施例5
取10ml羟基磁珠,100ml水洗。加入水8ml,环氧氯丙烷1.5ml,10M NaOH 0.5ml,置于摇床中,30℃活化3h。将活化的凝胶用水洗至中性。加入10ml含0.1M Na2CO3,1Mβ-丙氨酸,pH 9.5的溶液,置于摇床中40℃反应过夜。100ml水洗除去反应液。加入0.5M EDTA,pH 8.0,混匀后加入0.1g EDCI,25℃反应3h,再加入0.1g EDCI,25℃过夜。100ml水洗除去反应液。加入10ml 100mM NiSO4混匀后过滤,50ml水洗,50ml NaCl洗,100ml水洗,保存于10ml 20%乙醇中。其结构式同实施例2。
实施例6
按照如下Buffer配制裂解缓冲液(Buffer1)和洗脱缓冲液(Buffer2),
Buffer 1:
50mM NaH2PO4
300mM NaCl
pH 7.5。
Buffer 2:
50mM NaH2PO4
300mM NaCl
50mM咪唑
pH 7.5。
将大肠杆菌表达的带有6个His标签的重组蛋白A离心收集,沉淀用Buffer1重悬,超声破碎,离心收集蛋白上清;将对照和实施例1-3中制备的填料各1ml装入重力柱,水洗并用Buffer1平衡,用5ml蛋白上清过柱收集流穿液,10ml Buffer1洗涤,5ml Buffer2洗脱并收集,对各组分取样电泳。电泳结果如图1所示。其中对照为按照美国专利US2011/0071274A1的实施例1中记载的方法制备的纯化介质。
实施例7
按照如下Buffer配制裂解缓冲液(Buffer3)、洗涤缓冲液(Buffer4)及洗脱缓冲液(Buffer5)。
Buffer 3:
50mM NaH2PO4
150mM NaCl
pH 7.5。
Buffer 4:
50mM NaH2PO4
700mM NaCl
50mM咪唑
pH 7.5。
Buffer 5:
50mM NaH2PO4
150mM NaCl
50mM咪唑
pH 7.5。
将大肠杆菌表达的带有6个His标签的T4DNA Ligase离心收集,沉淀用Buffer3重悬,超声破碎,离心收集蛋白上清,将对照和实施例1-3中制备的填料各1ml装入重力柱,水洗并用Buffer3平衡,用5ml蛋白上清过柱收集流穿液,10ml Buffer3洗涤,5ml Buffer4洗涤并收集,5ml Buffer5洗脱并收集,对各组分取样电泳,电泳结果如图2-4所示。其中对照为按照US 20110071274实施例1中记载的方法制备的纯化介质。
如图1-4所示,螯合齿的增加能够增强填料对目的蛋白的选择性,相较对照,介质A-C均能减少杂蛋白的吸附,提供的额外羧基(介质AB)比额外羟基(介质C)效果更加明显。
Claims (10)
1.一种多齿配体的新型IMAC色谱介质,其特征在于:该介质具有如式(1)所示的结构:
(1)
其中G是活化后的固相支持介质;
R1为H,C1-C3烷烃或醇中的一种;
R2为提供额外配体齿的COOH,CONH2或CH2OH中的一种;
n1为2或3;
n2为0-3中任一整数。
2.根据权利要求1所述的多齿配体的新型IMAC色谱介质,其特征在于:所述固相支持介质为多孔固相支持物或磁性介质。
3.根据权利要求2所述的多齿配体的新型IMAC色谱介质,其特征在于:所述固相支持介质为琼脂糖、葡聚糖、硅胶或磁珠。
4.根据权利要求1-3中任一项所述的多齿配体的新型IMAC色谱介质,其特征在于:所述固相支持介质直径为20-200μm,由琼脂糖制成,n1为2,n2为0或1,R1为H,R2为COOH。
5.根据权利要求1-3中任一项所述的多齿配体的新型IMAC色谱介质,其特征在于:所述固相支持介质加载有金属离子,所述金属离子为Cu2+、Ni2+、Zn2+、Co2+、Fe3+或Ga3+。
6.根据权利要求1-5中任一项所述的多齿配体的新型IMAC色谱介质的制备方法,其特征在于其步骤包括:
(1)活化固相支持介质;
(2)活化后的固相支持介质与含羧基、酰胺或羟基的分子连接,在固相支持介质中引入羧基;
(3)步骤(2)的产物通过含酰胺键的缩合剂与含胺多羧酸缩合连接,得到如式(1)所示的介质。
7.根据权利要求6所述的制备方法,其特征在于:步骤(2)中含羧基、酰胺或羟基的分子为甘氨酸、α-丙氨酸、β-丙氨酸、乙醇胺、α-丙醇胺、β-丙醇胺、2-氨基乙酰胺、2-氨基丙酰胺或3-氨基丙酰胺的其中一种或任意两种或多种的组合。
8.根据权利要求7所述的制备方法,其特征在于:步骤(3)中含胺多羧酸为乙二胺四乙酸或丙二胺四乙酸,使用的缩合剂为EDC或EDCI。
9.根据权利要求8所述的制备方法,其特征在于:步骤(1)中的活化在碱性条件下进行,活化剂为环氧氯丙烷,环氧溴丙烷,乙二醇双缩水甘油醚、1,4-丁二醇双缩水甘油醚、1,6-己二醇双缩水甘油醚或聚乙二醇双缩水甘油醚的一种或任意两种或任意多种的组合。
10.根据权利要求6-9中任一项所述的制备方法,其特征在于:还包括步骤(4):步骤(3)的产物与金属离子螯合。
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