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晴晨夕语

新虫 (小有名气)

[求助] 酶活性测定已有1人参与

我要测C-S lyase酶活性,文献里说:细胞破碎时,加入无菌玻璃珠然后漩涡,这个漩涡是指漩涡振荡器吗?
         酶反应液:Reaction mixtures[containing 0.2 mM 5,5′-dithiobis (2-nitrobenzoic acid)] (DTNB),100 μM PLP, 4 mM substrate, CFEs (approximately 30 μg protein)in 100 mM potassium phosphate (pH 7.5) solution]也没说反应液体积。那我应该按多少配啊?(如果我体积少了,酶粗提取液30微克,那底物不就不够了吗?会影响酶的活性吧)
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yunshenglmm

金虫 (小有名气)

【答案】应助回帖

最近也在做酵母体外酶活测定,看资料酵母应该重悬在裂解缓冲液中,加等倍glassbeads,涡旋。有一种裂解缓冲液应该适合:
Breaking Buffer 50 mM sodium phosphate, pH 7.4
1 mM PMSF (phenylmethylsulfonyl fluoride or other protease inhibitors)
1 mM EDTA
5% glycerol
1. Prepare a stock solution of your desired protease inhibitors and store
appropriately. Follow manufacturer's recommendations.
2. For 1 liter, dissolve in 900 ml deionized water:
6 g sodium phosphate (monobasic), 372 mg EDTA, and 50 ml glycerol
3. Use NaOH to adjust pH and bring up the volume to 1 liter. Store at 4°C.
4. Right before use, add the protease inhibitors.
2楼2014-08-02 14:11:52
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