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Insights into the inhibitory mechanisms of NADH on the αγ heterodimer of human NAD-dependent isocitrate dehydrogenase.

Abstract：

:Human NAD-dependent isocitrate dehydrogenase (NAD-IDH) catalyzes the oxidative decarboxylation of isocitrate in the citric acid cycle. In the α2βγ heterotetramer of NAD-IDH, the γ subunit plays the regulatory role and the β subunit the structural role. Previous biochemical data have shown that mammalian NAD-IDHs can be inhibited by NADH; however, the molecular mechanism is unclear. In this work, we show that the αβ, αγ and α2βγ enzymes of human NAD-IDH can be inhibited by NADH, and further determine the crystal structure of the αγ heterodimer bound with an Mg2+ and an NADH at the active site and an NADH at the allosteric site, which resembles that of the inactive αMgγ heterodimer. The NADH at the active site occupies the binding site for NAD+ and prevents the binding of the cofactor. The NADH at the allosteric site occupies the binding sites for ADP and citrate and blocks the binding of the activators. The biochemical data confirm that the NADH binding competes with the binding of NAD+ and the binding of citrate and ADP, and the two effects together contribute to the NADH inhibition on the activity. These findings provide insights into the inhibitory mechanisms of the αγ heterodimer by NADH.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Liu Y,Hu L,Ma T,Yang J,Ding J

doi

10.1038/s41598-018-21584-7

subject

Has Abstract

pub_date

2018-02-16 00:00:00

pages

3146

issue

1

issn

2045-2322

pii

10.1038/s41598-018-21584-7

journal_volume

8

pub_type

杂志文章

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