western blot :目的蛋白分子量120(胞内域)和300(膜蛋白),表达量少,请问裂解培养的细胞可以直接用1*蛋白loading buffer裂解细胞提取蛋白吗,之后的蛋白浓度测定可以直接用紫外分光光度法测吗?这种方法提取蛋白与RIPA裂解液相比有什么优缺点吗?新手求助,如果能有具体的操作步骤更好了,先谢过了。作者: NBA 时间: 2013-6-4 16:59
A general protocol for sample preparation is described below.
Treat cells by adding fresh media containing regulator for desired time.
Aspirate media from cultures; wash cells with 1X PBS; aspirate.
Lyse cells by adding 1X SDS sample buffer (100 μl per well of 6-well plate or 500 μl per plate of 10 cm diameter plate). Immediately scrape the cells off the plate and transfer the extract to a microcentrifuge tube. Keep on ice.
Sonicate for 10–15 seconds for complete cell lysis and to shear DNA (to reduce sample viscosity).
Heat a 20 μl sample to 95–100°C for 5 minutes; cool on ice.
Microcentrifuge for 5 minutes.
Load 20 μl onto SDS-PAGE gel (10 cm x 10 cm). NOTE: CST recommends loading prestained molecular weight markers (#7720, 10 μl/lane) to verify electrotransfer and biotinylated protein ladder (#7727, 10 μl/lane) to determine molecular weights.
Electrotransfer to nitrocellulose or PVDF membrane.