Structural highlights
Publication Abstract from PubMedThe 3-hydroxyisobutyrate dehydrogenase (HIBADH) family catalyzes the NAD+- or NADP+-dependent oxidation of various beta-hydroxyacid substrates into their cognate semialdehydes for diverse metabolic pathways. Because HIBADH group members exhibit different substrate specificities, the substrate-recognition mode of each enzyme should be individually characterized. In the current study, we report the biochemical and structural analysis of a HIBADH group enzyme from Bacillus cereus (bcHIBADH). bcHIBADH mediates a dehydrogenation reaction on S-3-hydroxyisobutyrate substrate with high catalytic efficiency in an NAD+-dependent manner; it also oxidizes l-serine and 3-hydroxypropionate with lower activity. bcHIBADH consists of two domains and is further assembled into a functional dimer rather than a tetramer that has been commonly observed in other prokaryotic HIBADH group members. In the bcHIBADH structure, the interdomain cleft forms a putative active site and simultaneously accommodates both an NAD+ cofactor and a substrate mimic. Our structure-based comparative analysis highlights structural motifs that are important in the cofactor and substrate recognition of the HIBADH group. Structural and biochemical characterization of the Bacillus cereus 3-hydroxyisobutyrate dehydrogenase.,Park SC, Kim PH, Lee GS, Kang SG, Ko HJ, Yoon SI Biochem Biophys Res Commun. 2016 Apr 24. pii: S0006-291X(16)30640-4. doi:, 10.1016/j.bbrc.2016.04.126. PMID:27120461[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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