1QME

PENICILLIN-BINDING PROTEIN 2X (PBP-2X)

Summary for 1QME

• Entry DOI: 10.2210/pdb1qme/pdb
• Related: 1PMD 1QMF
• Descriptor: PENICILLIN-BINDING PROTEIN 2X, SULFATE ION (3 entities in total)
• Functional Keywords: penicillin-binding protein, peptidoglycan synthesis, resistance, cell wall, transmembrane
• Biological source: STREPTOCOCCUS PNEUMONIAE
• Total number of polymer chains: 1
• Total formula weight: 77096.16

Authors

Gordon, E.J.,Mouz, N.,Duee, E.,Dideberg, O. (deposition date: 1999-09-28, release date: 2000-05-25, Last modification date: 2023-12-13)

Primary citation

Gordon, E.J.,Mouz, N.,Duee, E.,Dideberg, O.
The Crystal Structure of the Penicillin-Binding Protein 2X from Streptococcus Pneumoniae and its Acyl-Enzyme Form: Implication in Drug Resistance.
J.Mol.Biol., 299:477-, 2000

PubMed Abstract: Penicillin-binding proteins (PBPs), the primary targets for beta-lactam antibiotics, are periplasmic membrane-attached proteins responsible for the construction and maintenance of the bacterial cell wall. Bacteria have developed several mechanisms of resistance, one of which is the mutation of the target enzymes to reduce their affinity for beta-lactam antibiotics. Here, we describe the structure of PBP2x from Streptococcus pneumoniae determined to 2.4 A. In addition, we also describe the PBP2x structure in complex with cefuroxime, a therapeutically relevant antibiotic, at 2.8 A. Surprisingly, two antibiotic molecules are observed: one as a covalent complex with the active-site serine residue, and a second one between the C-terminal and the transpeptidase domains. The structure of PBP2x reveals an active site similar to those of the class A beta-lactamases, albeit with an absence of unambiguous deacylation machinery. The structure highlights a few amino acid residues, namely Thr338, Thr550 and Gln552, which are directly related to the resistance phenomenon.

PubMed: 10860753
DOI: 10.1006/JMBI.2000.3740

Experimental method

X-RAY DIFFRACTION (2.4 Å)