2c2i
Structure and function of Rv0130, a conserved hypothetical protein from M.tuberculosis
Structural highlights
FunctionHTDZ_MYCTU Shows trans-enoyl-CoA hydratase/3-hydroxyacyl-CoA dehydratase activity. In vitro, can hydrate (2E)-butenoyl-CoA, (2E)-hexenoyl-CoA and (2E)-decenoyl-CoA.[1] [2] [3] 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 PubMedA large fraction of the Mycobacterium tuberculosis genome codes for proteins of unknown function. We here report the structure of one of these proteins, Rv0130, solved to a resolution of 1.8 a. The Rv0130 monomer features a single hotdog fold composed of a highly curved beta-sheet on top of a long and a short alpha-helix. Two monomers in turn pack to form a double-hotdog-folded homodimer, similar to a large group of enzymes that use thiol esters as substrates. Rv0130 was found to contain a highly conserved R-specific hydratase motif buried deeply between the two monomers. Our biochemical studies show that the protein is able to hydrate a short trans-2-enoyl-coenzyme A moiety with a k(cat) of 1.1 x 10(2) sec(-1). The importance of the side chains of D40 and H45 for hydratase activity is demonstrated by site-directed mutagenesis. In contrast to many hotdog-folded proteins, a proline residue distorts the central helix of Rv0130. This distortion allows the creation of a long, curved tunnel, similar to the substrate-binding channels of long-chain eukaryotic hydratase 2 enzymes. Structure and function of Rv0130, a conserved hypothetical protein from Mycobacterium tuberculosis.,Johansson P, Castell A, Jones TA, Backbro K Protein Sci. 2006 Oct;15(10):2300-9. Epub 2006 Sep 8. PMID:16963641[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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