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叫我阿离哈92

新虫 (初入文坛)

[求助] 关于酶活性检测的问题 已有1人参与

关于酶的检测的,文献中说到的NADPH-generating system 是怎么参与到酶检测的,起到的作用是什么?这段就没怎么看懂,求能人指教



The incubation mixture, with a total volume of 200 μl, consisted of 100mM potassium phosphate buffer (pH 7.4), NADPH-generating system (1 mM NADP+, 10 mM glucose-6-phosphate, 1 unit/mL of glucose-6-phosphate dehydrogenase, and 4 mM MgCl2), and human liver microsomes or CYPs.
In all experiments, NCMN (20 mM dissolved in acetonitrile previously) was serially diluted to the required concentrations and the final concentration of acetonitrile did not exceed 1% (v/v) in the mixture. After preincubation at 37oC for 3 min, the reaction was initiated by adding NADPH-generating system and further incubated at 37oC in a shaking water bath. The reaction was terminated by the addition of ice-cold acetonitrile (100 μl). The
mixture was kept on ice until it was centrifuged at 20,000×g for 20 min at 4oC. Aliquots of supernatants were stored at -20oC until analysis. Aliquots of supernatants were taken for further fluorescence analysis (Gain = 60 for substrate and Gain =100 for metabolite). Control incubations without
NADPH-generating system or without substrate or without CYP enzyme sources were carried out to investigate whether the formation of metabolite(s) was enzyme (CYP)- and NADPH-dependent. All incubations throughout the study were carried out in duplicate with SD.values generally below
10%.
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cai3110274

木虫 (职业作家)

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3楼: Originally posted by 叫我阿离哈92 at 2017-04-28 15:53:18
那我该怎么配置这个再生体系?使用的时候有什么注意的地方嘛?
...

查下参考文献 一般都有写加多少量的 直接加在酶反应体系中 注意单位换算一下就可以了
夫天地者万物之逆旅
4楼2017-05-13 23:15:22
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cai3110274

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感谢参与,应助指数 +1
叫我阿离哈92: 金币+5, 有帮助 2017-05-13 21:33:29
NADPH-generating system (1 mM NADP+, 10 mM glucose-6-phosphate, 1 unit/mL of glucose-6-phosphate dehydrogenase, and 4 mM MgCl2)
这个是NADPH再生体系,是PPP途径的第一步反应,看下反应式就知道了
CYP酶反应时消耗NADPH,再生体系保证了NADPH的供应
大概是这么个意思
夫天地者万物之逆旅
2楼2017-04-28 08:23:25
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叫我阿离哈92

新虫 (初入文坛)

引用回帖:
2楼: Originally posted by cai3110274 at 2017-04-28 08:23:25
NADPH-generating system (1 mM NADP+, 10 mM glucose-6-phosphate, 1 unit/mL of glucose-6-phosphate dehydrogenase, and 4 mM MgCl2)
这个是NADPH再生体系,是PPP途径的第一步反应,看下反应式就知道了
CYP酶 ...

那我该怎么配置这个再生体系?使用的时候有什么注意的地方嘛?

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3楼2017-04-28 15:53:18
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