1snn
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(New page: 200px<br /><applet load="1snn" size="450" color="white" frame="true" align="right" spinBox="true" caption="1snn, resolution 1.55Å" /> '''3,4-dihydroxy-2-buta...)
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Revision as of 00:23, 21 November 2007
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3,4-dihydroxy-2-butanone 4-phosphate synthase from Methanococcus jannaschii
Overview
The crystal structure of Methanococcus jannaschii 3,4-dihydroxy-2-butanone, 4-phosphate synthase in complex with the substrate ribulose 5-phosphate at, a dimetal centre has recently been determined at 1.7 A resolution. The, enzyme converts ribulose 5-phosphate into 3,4-dihydroxy-2-butanone, 4-phosphate, while its C4 atom is released as formate. The resulting, four-carbon body supplies all eight C atoms for the xylene moiety of, riboflavin. Three of the four hydroxyl groups of ribulose 5-phosphate were, coordinated by the metal ions. Based on crystallographic refinement, the, metals were assigned as zinc and calcium, which were present in the, crystallization buffer. Neither metal supports the enzymatic reaction. In, the present study, the correctness of this assignment is assessed using, anomalous diffraction data collected at the high-energy side of the zinc, absorption edge (lambda = 1.2823 A). Only the three tentative zinc ions, give strong peaks in an anomalous difference Fourier map (>20sigma), whereas the four tentative calcium ions do not show anomalous signals, above the noise level. These results confirm the initial assignment. In, addition, the resolution was improved to 1.55 A.
About this Structure
1SNN is a Single protein structure of sequence from Methanocaldococcus jannaschii with 5RP, ZN and CA as ligands. Full crystallographic information is available from OCA.
Reference
Metal sites in 3,4-dihydroxy-2-butanone 4-phosphate synthase from Methanococcus jannaschii in complex with the substrate ribulose 5-phosphate., Steinbacher S, Schiffmann S, Bacher A, Fischer M, Acta Crystallogr D Biol Crystallogr. 2004 Jul;60(Pt 7):1338-40. Epub 2004, Jun 22. PMID:15213409
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