1gpu
From Proteopedia
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(New page: 200px<br /> <applet load="1gpu" size="450" color="white" frame="true" align="right" spinBox="true" caption="1gpu, resolution 1.86Å" /> '''TRANSKETOLASE COMPL...)
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Revision as of 17:40, 29 October 2007
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TRANSKETOLASE COMPLEX WITH REACTION INTERMEDIATE
Overview
Kinetic and spectroscopic data indicated that addition of the donor, substrate hydroxypyruvate to the thiamin diphosphate (ThDP)-dependent, enzyme transketolase (TK) led to the accumulation of the, alpha-carbanion/enamine of (alpha,beta-dihydroxyethyl) ThDP, the key, reaction intermediate in enzymatic thiamin catalysis. The, three-dimensional structure of this intermediate trapped in the active, site of yeast TK was determined to 1.9-A resolution by using, cryocrystallography. The electron density suggests a planar, alpha-carbanion/enamine intermediate having the E-configuration. The, reaction intermediate is firmly held in place through direct hydrogen, bonds to His-103 and His-481 and an indirect hydrogen bond via a water, molecule to His-69. The 4-NH(2) group of the amino-pyrimidine ... [(full description)]
About this Structure
1GPU is a [Single protein] structure of sequence from [Saccharomyces cerevisiae] with CA and THD as [ligands]. Active as [[1]], with EC number [2.2.1.1]. Full crystallographic information is available from [OCA].
Reference
Snapshot of a key intermediate in enzymatic thiamin catalysis: crystal structure of the alpha-carbanion of (alpha,beta-dihydroxyethyl)-thiamin diphosphate in the active site of transketolase from Saccharomyces cerevisiae., Fiedler E, Thorell S, Sandalova T, Golbik R, Konig S, Schneider G, Proc Natl Acad Sci U S A. 2002 Jan 22;99(2):591-5. Epub 2002 Jan 2. PMID:11773632
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