5hxd

Crystal structure of murein-tripeptide amidase MpaA from Escherichia coli O157

spinqualitylabelsall models 5hxd, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5hxd is a 2 chain structure with sequence from Escherichia coli O157:H7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: CAC, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MPAA_ECO57 Publication Abstract from PubMed Peptidoglycan (PG) is an essential component of the cell wall, and undergoes reconstruction by various PG hydrolases during cell growth, development and division. The murein- tripeptide (Mtp) amidase MpaA belongs to PG hydrolase family and is responsible for cleaving the gamma-D-Glu-meso-Dap amide bond in the Mtp released during PG turnover. The current paper reports the crystal structure of MpaA from Escherichia coli (E. coli) O157 at 2.6 A resolution. The asymmetric unit consists of two protein molecules and each monomer represents the common alpha/beta fold of metallo-carboxypeptidases (MCP). The Tyr133-Asp143 loop appears to mediate the entrance and binding of the substrate into the active groove. A structural comparison of MpaA with its homologue from Vibrio harveyi showed that MpaA has narrower active pocket entrance with a smaller surface opening, which is determined by the Val204-Thr211 loop. The reported structure provides a starting point for the molecular mechanism of MpaA in a significant human pathogen. Crystal Structure of Murein-Tripeptide Amidase MpaA from Escherichia coli O157 at 2.6 A Resolution.,Ma Y, Bai G, Cui Y, Zhao J, Yuan Z, Liu X Protein Pept Lett. 2016 Nov 28. PMID:27894248 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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