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补充β-actin抗体的一些信息:
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肌动蛋白(actin)是一种重要的骨架蛋白,目前在动物细胞中发现至少有6种亚型存在:“Nonmuscle beta- and gamma-actin, also known as cytoplasmic actin, are predominantly expressed in nonmuscle cells, controling cell structure and motility. alpha-cardiac and alpha-skeletal actin are expressed in striated cardiac and skeletal muscles, respectively; two smooth muscle actins, alpha- and gamma-actin, are found primarily in vascular smooth muscle and enteric smooth muscle, respectively. ”
因此,理论上,特异性针对beta-actin的抗体必然在心肌和横纹肌中检测不到条带.但实际上,因为存在如下问题:
1,不同型actin之间具有较高的序列相似性(>90%).
2,公司制备抗体是选用beta-actin的某一段小短肽作为免疫原.
因此,可能会因为选取的短肽在不同型actin之间保守与否,而导致所制备抗体具有一定的组织特异性.如,选取的短肽仅在beta型存在,所得抗体就仅能检测Nonmuscle 细胞中的actin,而选取的短肽在六型中均存在,则此抗体除Nonmuscle细胞外,还可以检测cardiac,skeletal,smooth muscle细胞的actin.