title: A structural variation for MurB: X-ray crystal structure of Staphylococcus aureus UDP-N-acetylenolpyruvylglucosamine reductase (MurB).
abstract: The X-ray crystal structure of the substrate free form of Staphylococcus aureus UDP-N-acetylenolpyruvylglucosamine reductase (MurB) has been solved to 2.3 A resolution with an R-factor of 20.3% and a free R-factor of 22.3%. While the overall fold of the S. aureus enzyme is similar to that of the homologous Escherichia coli MurB X-ray crystal structure, notable distinctions between the S. aureus and E. coli MurB protein structures occur in residues involved in substrate binding. Analysis of available MurB sequences from other bacteria suggest that the S. aureus MurB structure is representative of a distinct structural class of UDP-N-acetylenolpyruvylglucosamine reductases including Bacillus subtilis and Helicobacter pylori that are characterized by a modified mechanism for substrate binding.
authors.affiliation: Structural, Analytical, and Medicinal Chemistry, Biology, and Protein Science, Pharmacia Corporation, 301 Henrietta Street, Kalamazoo, Michigan 49007, USA. timothy.e.benson@pharmacia.com
authors.forename: T E
authors.initials: TE
authors.lastname: Benson
authors.forename: M S
authors.initials: MS
authors.lastname: Harris
authors.forename: G H
authors.initials: GH
authors.lastname: Choi
authors.forename: J I
authors.initials: JI
authors.lastname: Cialdella
authors.forename: J T
authors.initials: JT
authors.lastname: Herberg
authors.forename: J P
authors.initials: JP
authors.lastname: Martin
authors.forename: E T
authors.initials: ET
authors.lastname: Baldwin
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry; D001665:Binding Sites; D002237:Carbohydrate Dehydrogenases / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D005182:Flavin-Adenine Dinucleotide / Q000737:chemistry; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D017510:Protein Folding; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012996:Solutions; D013211:Staphylococcus aureus / Q000201:enzymology*; D013379:Substrate Specificity
chemical_list: D001426:Bacterial Proteins; D012996:Solutions; D005182:Flavin-Adenine Dinucleotide; D002237:Carbohydrate Dehydrogenases; C023215:UDP-N-acetylmuramate dehydrogenase