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Conformational changes on substrate binding revealed by structures of Methylobacterium extorquens malate dehydrogenase

Journal Article · · Acta Crystallographica. Section F, Structural Biology Communications
In this paper, three high-resolution X-ray crystal structures of malate dehydrogenase (MDH; EC 1.1.1.37) from the methylotrophMethylobacterium extorquensAM1 are presented. By comparing the structures of apo MDH, a binary complex of MDH and NAD+, and a ternary complex of MDH and oxaloacetate with ADP-ribose occupying the pyridine nucleotide-binding site, conformational changes associated with the formation of the catalytic complex were characterized. While the substrate-binding site is accessible in the enzyme resting state or NAD+-bound forms, the substrate-bound form exhibits a closed conformation. This conformational change involves the transition of an α-helix to a 310-helix, which causes the adjacent loop to close the active site following coenzyme and substrate binding. Finally, in the ternary complex, His284 forms a hydrogen bond to the C2 carbonyl of oxaloacetate, placing it in a position to donate a proton in the formation of (2S)-malate.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
Laboratory Directed Research and Development (LDRD); USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1477666
Report Number(s):
LA-UR-18-24857
Journal Information:
Acta Crystallographica. Section F, Structural Biology Communications, Journal Name: Acta Crystallographica. Section F, Structural Biology Communications Journal Issue: 10 Vol. 74; ISSN ACSFEN; ISSN 2053-230X
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

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