1g57
From Proteopedia
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CRYSTAL STRUCTURE OF 3,4-DIHYDROXY-2-BUTANONE 4-PHOSPHATE SYNTHASE
Overview
BACKGROUND: 3,4-Dihydroxy-2-butanone-4-phosphate synthase catalyzes a, commitment step in the biosynthesis of riboflavin. On the enzyme, ribulose, 5-phosphate is converted to 3,4-dihydroxy-2-butanone 4-phosphate and, formate in steps involving enolization, ketonization, dehydration, skeleton rearrangement, and formate elimination. The enzyme is absent in, humans and an attractive target for the discovery of antimicrobials for, pathogens incapable of acquiring sufficient riboflavin from their hosts., The homodimer of 23 kDa subunits requires Mg(2+) for activity. RESULTS:, The first three-dimensional structure of the enzyme was determined at 1.4, A resolution using the multiwavelength anomalous diffraction (MAD) method, on Escherichia coli protein crystals containing gold. The protein consists, of an alpha + beta fold having a complex linkage of beta strands., Intersubunit contacts are mediated by numerous hydrophobic interactions, and three hydrogen bond networks. CONCLUSIONS: A proposed active site was, identified on the basis of amino acid residues that are conserved among, the enzyme from 19 species. There are two well-separated active sites per, dimer, each of which comprise residues from both subunits. In addition to, three arginines and two threonines, which may be used for recognizing the, phosphate group of the substrate, the active site consists of three, glutamates, two aspartates, two histidines, and a cysteine which may, provide the means for general acid and base catalysis and for coordinating, the Mg(2+) cofactor within the active site.
About this Structure
1G57 is a Single protein structure of sequence from Escherichia coli with CS as ligand. Full crystallographic information is available from OCA.
Reference
Crystal structure of 3,4-dihydroxy-2-butanone 4-phosphate synthase of riboflavin biosynthesis., Liao DI, Calabrese JC, Wawrzak Z, Viitanen PV, Jordan DB, Structure. 2001 Jan 10;9(1):11-8. PMID:11342130
Page seeded by OCA on Tue Nov 20 15:42:55 2007
