产品简介

天然蛋白A（Protein A）是一种发现于金黄色葡萄球菌的细胞壁表面蛋白，天然蛋白G（Protein G）是一种分离自G型或C型链球菌属的细胞表面蛋白，二者功能相似，主要通过与免疫球蛋白（Ig）的Fc区相互作用，可结合大多数哺乳动物的IgG。然而两者结合特异性上有所不同（详细见附录1，蛋白A，G对不同物种Ig的结合能力总表）。蛋白A，蛋白G常共价偶联在固体载体如琼脂糖珠或丙烯酸树脂小珠上，直接用以做免疫沉淀（IP）或者免疫共沉淀（Co-IP）来进行蛋白功能相关研究，或者直接装在层析柱上来纯化单克隆或者多克隆抗体。

本品使用的是基因改造后的蛋白A和蛋白G，不仅维持其本身的Ig亲和特性，同时也去除了天然蛋白本身的非主要结合域以降低非特异性结合。本品同时将蛋白A和蛋白G共价偶联到琼脂糖凝胶微球表面，比单独的蛋白A或者蛋白G都有更广的结合范围，适合于所有蛋白A琼脂糖珠和蛋白G琼脂糖珠单独可以结合的Ig，实用性更高。

产品信息

产品性质

储存条件

2~8℃保存，有效期2年。

附录1. 蛋白A，G对不同物种Ig的结合能力总表

Ver.CN20230824

Q：为什么柱子反压过高？

A：可能是填料被堵塞；裂解液中含有微笑的固体颗粒，建议上柱前使用 0.22 µm/0.45

µm 滤膜过滤。

Q：为什么洗脱组分中没有目的蛋白？

A：可能是抗体被降解；建议适当的提高洗脱pH。

Q：该产品可以直接使用吗？

A：Protein A 琼脂糖珠最好在使用前充分颠倒若干次，使琼脂糖珠混合均匀。

Q：该产品可以贮存在–20℃吗？

A：不可以，不可冷冻该产品。应置于 4°贮存。

Q：说明书中COIP实验操作中取适量填料是要加多少量的填料？

A：一般填料的量是根据自己要做的样品的量决定。最小的常用COIP体系为：20ul填料+5ug抗体与总体积500ul 总蛋白浓度1mg/ml的裂解液混合孵育。

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