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落日余晖34

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[求助] 一种酶是否需要多种辅酶才能发挥酶活呢?

1.各位虫友好,最近在做的酶的催化时,发现该酶不仅需要NADH,也需要FMN,请问这种酶需要这两种辅酶才能发挥酶活吗?但是从酶活测定上看,只有NADH被消耗了,那这FMN的作用是什么呢?
2.另外为什么要选择磷酸钾缓冲液呢?磷酸钠是否也可以呢,钾钠在酶催化上游什么区别吗?
3.以下是酶活验证步骤,请各位虫友指教了:The enzyme assay of ca2ENR was performed by monitoring the consumption of NADH using a DU® 800 UV/Visible Spectrophotometer . A reaction mixture containing 100 mM potassium phosphate (pH 7.0), 0.2 mM NADH, 5 μM FMN and 5 μM purified ca2ENR protein was prepared in a quartz cuvette with a butyl rubber stopper. After replacing the head space with nitrogen gas, a reaction was initiated by addition of 10 mM 4ACA at 30 °C. The reduction of 4ACA into 4AHCAwas measured as the decrease in absorbance at 370 nm due to oxidation of NADH.
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