Crystallization and preliminary X-ray crystallographic studies of UDP-N-acetylenolpyruvylglucosamine reductase.
The overexpression and purification of the second enzyme in Escherichia coli peptidoglycan biosynthesis, UDP-N-acetylenolpyruvylglucosamine reductase (MurB), provided sufficient protein to undertake crystallization and X-ray crystallographic studies of the enzyme. MurB crystallizes in 14-20% PEG 8000, 100 mM sodium cacodylate, pH 8.0, and 200 mM calcium acetate in the presence of its substrate UDP-N-acetylglucosamine enolpyruvate. Crystals of MurB belong to the tetragonal space group P4(1)2(1)2 with a = b = 49.6 A, c = 263.2 A, and alpha = beta = gamma = 90 degrees at -160 degrees C and diffract to at least 2.5 A. Screening for heavy atom derivatives has yielded a single site that is reactive with both methylmercury nitrate and Thimerosal.
Benson
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Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115.
Walsh
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CT
Hogle
J M
JM
D001426:Bacterial Proteins; D002237:Carbohydrate Dehydrogenases / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000201:enzymology*; D010457:Peptidoglycan / Q000096:biosynthesis
D001426:Bacterial Proteins; D010457:Peptidoglycan; D002237:Carbohydrate Dehydrogenases; C023215:UDP-N-acetylmuramate dehydrogenase