7ul6

CryoEM structure of full-length dimeric ClbP

spinqualitylabelsall models 7ul6, resolution 3.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7ul6 is a 2 chain structure with sequence from Escherichia coli CFT073. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.73Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q0P7K6_ECOLX Publication Abstract from PubMed Colibactin, a DNA cross-linking agent produced by gut bacteria, is implicated in colorectal cancer. Its biosynthesis uses a prodrug resistance mechanism: a non-toxic precursor assembled in the cytoplasm is activated after export to the periplasm. This activation is mediated by ClbP, an inner-membrane peptidase with an N-terminal periplasmic catalytic domain and a C-terminal three-helix transmembrane domain. Although the transmembrane domain is required for colibactin activation, its role in catalysis is unclear. Our structure of full-length ClbP bound to a product analog reveals an interdomain interface important for substrate binding and enzyme stability and interactions that explain the selectivity of ClbP for the N-acyl-D-asparagine prodrug motif. Based on structural and biochemical evidence, we propose that ClbP dimerizes to form an extended substrate-binding site that can accommodate a pseudodimeric precolibactin with its two terminal prodrug motifs in the two ClbP active sites, thus enabling the coordinated activation of both electrophilic warheads. Structural basis of colibactin activation by the ClbP peptidase.,Velilla JA, Volpe MR, Kenney GE, Walsh RM Jr, Balskus EP, Gaudet R Nat Chem Biol. 2023 Feb;19(2):151-158. doi: 10.1038/s41589-022-01142-z. Epub 2022 , Oct 17. PMID:36253550 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Beta-lactamase 3D structures

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