Structural highlights
Function
[TKT1_ECOLI] Catalyzes the reversible transfer of a two-carbon ketol group from sedoheptulose-7-phosphate to glyceraldehyde-3-phosphate, producing xylulose-5-phosphate and ribose-5-phosphate. Catalyzes the transfer of a two-carbon ketol group from a ketose donor to an aldose acceptor, via a covalent intermediate with the cofactor thiamine pyrophosphate.[1]
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 PubMed
The Escherichia coli enzyme transketolase, a dimeric protein of 2 x 70 kDa (662 amino acids) has been prepared from an overexpression system in E. coli. The purified enzyme has been crystallized from PIPES buffer pH 6.4 and ammonium sulfate. The crystals which grow as large plates diffract to greater than 1.9 A, resolution and are of the space group P2(1)2(1)2(1) with unit-cell dimensions of a = 74.6, b = 125.6 and c = 151.0 A, (Z = 8 with one transketolase dimer in the asymmetric unit). The structure has been solved by molecular replacement using the yeast transketolase enzyme structure as a search model. The enzyme is being used for large-scale biotransformations using various aldehydes and hydroxypyruvate as substrates.
Crystallization and preliminary X-ray crystallographic data with Escherichia coli transketolase.,Littlechild J, Turner N, Hobbs G, Lilly M, Rawas A, Watson H Acta Crystallogr D Biol Crystallogr. 1995 Nov 1;51(Pt 6):1074-6. doi:, 10.1107/S0907444995005415. PMID:15299777[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Asztalos P, Parthier C, Golbik R, Kleinschmidt M, Hubner G, Weiss MS, Friedemann R, Wille G, Tittmann K. Strain and near attack conformers in enzymic thiamin catalysis: X-ray crystallographic snapshots of bacterial transketolase in covalent complex with donor ketoses xylulose 5-phosphate and fructose 6-phosphate, and in noncovalent complex with acceptor aldose ribose 5-phosphate. Biochemistry. 2007 Oct 30;46(43):12037-52. Epub 2007 Oct 3. PMID:17914867 doi:10.1021/bi700844m
- ↑ Littlechild J, Turner N, Hobbs G, Lilly M, Rawas A, Watson H. Crystallization and preliminary X-ray crystallographic data with Escherichia coli transketolase. Acta Crystallogr D Biol Crystallogr. 1995 Nov 1;51(Pt 6):1074-6. doi:, 10.1107/S0907444995005415. PMID:15299777 doi:http://dx.doi.org/10.1107/S0907444995005415
