Structure and function of Rv0130, a conserved hypothetical protein from Mycobacterium tuberculosis
2006 (English)In: Protein Science, ISSN 0961-8368, Vol. 15, no 10, 2300-2309 p.Article in journal (Refereed) Published
A 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 angstrom. 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.
Place, publisher, year, edition, pages
2006. Vol. 15, no 10, 2300-2309 p.
Rv0130, Mycobacterium tuberculosis, hydratase, hotdog fold, crystal structure
IdentifiersURN: urn:nbn:se:uu:diva-94234DOI: 10.1110/ps.062309306ISI: 000240851300008PubMedID: 16963641OAI: oai:DiVA.org:uu-94234DiVA: diva2:168016