3hun | pdb_00003hun

Crystal structure of Penicillin binding protein 4 from Staphylococcus aureus COL in complex with Ampicillin

spinqualitylabelsall models 3hun, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hun is a 2 chain structure with sequence from Staac. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZZ7 Gene: pbp4 (STAAC) Activity: Serine-type D-Ala-D-Ala carboxypeptidase, with EC number 3.4.16.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Penicillin binding proteins (PBPs) are membrane-associated proteins that catalyze the final step of murein biosynthesis. These proteins function as either transpeptidases or carboxypeptidases and in a few cases demonstrate transglycosylase activity. Both transpeptidase and carboxypeptidase activities of PBPs occur at the D-Ala-D-Ala terminus of a murein precursor containing a disaccharide pentapeptide comprising N-acetylglucosamine and N-acetyl-muramic acid-L-Ala-D-Glu-L-Lys-D-Ala-D-Ala. Beta-lactam antibiotics inhibit these enzymes by competing with the pentapeptide precursor for binding to the active site of the enzyme. Here we describe the crystal structure, biochemical characteristics, and expression profile of PBP4, a low-molecular-mass PBP from Staphylococcus aureus strain COL. The crystal structures of PBP4-antibiotic complexes reported here were determined by molecular replacement, using the atomic coordinates deposited by the New York Structural Genomics Consortium. While the pbp4 gene is not essential for the viability of S. aureus, the knockout phenotype of this gene is characterized by a marked reduction in cross-linked muropeptide and increased vancomycin resistance. Unlike other PBPs, we note that expression of PBP4 was not substantially altered under different experimental conditions, nor did it change across representative hospital- or community-associated strains of S. aureus that were examined. In vitro data on purified recombinant S. aureus PBP4 suggest that it is a beta-lactamase and is not trapped as an acyl intermediate with beta-lactam antibiotics. Put together, the expression analysis and biochemical features of PBP4 provide a framework for understanding the function of this protein in S. aureus and its role in antimicrobial resistance. Molecular basis for the role of Staphylococcus aureus penicillin binding protein 4 in antimicrobial resistance.,Navratna V, Nadig S, Sood V, Prasad K, Arakere G, Gopal B J Bacteriol. 2010 Jan;192(1):134-44. Epub . PMID:19854906 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Penicillin-binding protein 3D structures

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