2mtz

Haddock model of Bacillus subtilis L,D-transpeptidase in complex with a peptidoglycan hexamuropeptide

spinqualitylabelsall models 2mtz Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2mtz is a 7 chain structure with sequence from Bacillus subtilis and Bacillus subtilis subsp. subtilis str. 168. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solid-state NMR Ligands: AMU, API, DAL, FGA, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function YKUD_BACSU Probable enzyme that may play an important role in cell wall biology. Publication Abstract from PubMed The maintenance of bacterial cell shape and integrity is largely attributed to peptidoglycan, a highly cross-linked biopolymer. The transpeptidases that perform this cross-linking are important targets for antibiotics. Despite this biomedical importance, to date no structure of a protein in complex with an intact bacterial peptidoglycan has been resolved, primarily due to the large size and flexibility of peptidoglycan sacculi. Here we use solid-state NMR spectroscopy to derive for the first time an atomic model of an l,d-transpeptidase from Bacillus subtilis bound to its natural substrate, the intact B. subtilis peptidoglycan. Importantly, the model obtained from protein chemical shift perturbation data shows that both domains-the catalytic domain as well as the proposed peptidoglycan recognition domain-are important for the interaction and reveals a novel binding motif that involves residues outside of the classical enzymatic pocket. Experiments on mutants and truncated protein constructs independently confirm the binding site and the implication of both domains. Through measurements of dipolar-coupling derived order parameters of bond motion we show that protein binding reduces the flexibility of peptidoglycan. This first report of an atomic model of a protein-peptidoglycan complex paves the way for the design of new antibiotic drugs targeting l,d-transpeptidases. The strategy developed here can be extended to the study of a large variety of enzymes involved in peptidoglycan morphogenesis. Atomic model of a cell-wall cross-linking enzyme in complex with an intact bacterial peptidoglycan.,Schanda P, Triboulet S, Laguri C, Bougault CM, Ayala I, Callon M, Arthur M, Simorre JP J Am Chem Soc. 2014 Dec 24;136(51):17852-60. doi: 10.1021/ja5105987. Epub 2014, Dec 10. PMID:25429710 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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