CoIPProtocol1
一 原理:IP是利用抗原蛋白质和抗体的特异性结合以及细菌蛋白质的“prorein A"特异性地结合到免疫球蛋白的FC片段的现象活用开发出来的方法。目前多用精制的prorein A预先结合固化在argarose的beads上,使之与含有抗原的溶液及抗体反应后,beads上的prorein A就能吸附抗原达到精制的目的。实验最需要注意点就是抗体的性质。抗体不同和抗原结合能力也不同,免染能结合未必能用在IP反应。建议仔细检查抗体的说明书。特别是多抗的特异性是问题。其次,要注意溶解抗原的缓冲液的性质。多数的抗原是细胞构成的蛋白,特别是骨架蛋白,缓冲液必须要使其溶解。为此,必须使用含有强界面活性剂的缓冲液,尽管它有可能影响一部分抗原抗体的结合。另一面,如用弱界面活性剂溶解细胞,就不能充分溶解细胞蛋白。即便溶解也产生与其它的蛋白结合的结果,抗原决定族被封闭,影响与抗体的结合,即使IP成功,也是很多蛋白与抗体共沉的悲惨结果。再次,为......阅读全文
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IP防水等级测试方法(二)
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7. Resuspend the pellet with 3 ml S1 solution (Figure 3). The pellet should be resuspended readily by pipetting up and down. A pellet that cannot be r
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1. Wear gloves at all time including filling pipet tip in racks, filling jars with Eppendorf tubes, and weighing chemicals to prepare solution