1ohl
YEAST 5-AMINOLAEVULINIC ACID DEHYDRATASE PUTATIVE CYCLIC REACTION INTERMEDIATE COMPLEXYEAST 5-AMINOLAEVULINIC ACID DEHYDRATASE PUTATIVE CYCLIC REACTION INTERMEDIATE COMPLEX
Structural highlights
FunctionHEM2_YEAST Catalyzes an early step in the biosynthesis of tetrapyrroles. Binds two molecules of 5-aminolevulinate per subunit, each at a distinct site, and catalyzes their condensation to form porphobilinogen. 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 X-ray structure of yeast 5-aminolaevulinic acid dehydratase, in which the catalytic site of the enzyme is complexed with a putative cyclic intermediate composed of both substrate moieties, has been solved at 0.16 nm (1.6 A) resolution. The cyclic intermediate is bound covalently to Lys(263) with the amino group of the aminomethyl side chain ligated to the active-site zinc ion in a position normally occupied by a catalytic hydroxide ion. The cyclic intermediate is catalytically competent, as shown by its turnover in the presence of added substrate to form porphobilinogen. The findings, combined with those of previous studies, are consistent with a catalytic mechanism in which the C-C bond linking both substrates in the intermediate is formed before the C-N bond. X-ray structure of a putative reaction intermediate of 5-aminolaevulinic acid dehydratase.,Erskine PT, Coates L, Butler D, Youell JH, Brindley AA, Wood SP, Warren MJ, Shoolingin-Jordan PM, Cooper JB Biochem J. 2003 Aug 1;373(Pt 3):733-8. PMID:12777167[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||