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The high resolution structure of Mycobacterium tuberculosis LeuB (Rv2995c)The high resolution structure of Mycobacterium tuberculosis LeuB (Rv2995c)
Structural highlights
FunctionLEU3_MYCTU Catalyzes the oxidation of 3-carboxy-2-hydroxy-4-methylpentanoate (3-isopropylmalate) to 3-carboxy-4-methyl-2-oxopentanoate. The product decarboxylates to 4-methyl-2 oxopentanoate.[HAMAP-Rule:MF_01035] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe crystal structure of the enzyme 3-isopropylmalate dehydrogenase (IPMDH) from Mycobacterium tuberculosis (LeuB, Mtb-IPMDH, Rv2995c) without substrate or co-factor was determined at 1.65 A resolution, which is the highest resolution reported for an IPMDH to date. The crystals contain two functional dimers in the asymmetric unit in an arrangement close to a tetramer of D2 symmetry. Despite the absence of a substrate or inhibitor bound to the protein, the structure of the monomer resembles the previously observed closed form of the enzyme more closely than the open form. A comparison with the substrate complex of IPMDH from Thiobacillus ferrooxidans and the co-factor complex of the Thermus thermophilus enzyme revealed a close relationship of the active-site architecture between the various bacterial enzymes. The inhibitor O-isobutenyl oxalylhydroxamate was found to bind to the active site of IPMDH in a mode similar to the substrate isopropylmalate. The high-resolution Structure of LeuB (Rv2995c) from Mycobacterium tuberculosis.,Singh RK, Kefala G, Janowski R, Mueller-Dieckmann C, von Kries JP, Weiss MS J Mol Biol. 2005 Feb 11;346(1):1-11. Epub 2004 Dec 23. PMID:15663922[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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