5imb

Crystal structure of peptidyl-tRNA hydrolase mutant-N14D from Vibrio cholerae

spinqualitylabelsall models 5imb, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5imb is a 2 chain structure with sequence from Vibrio cholerae O1 biovar El Tor str. N16961. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.4Å Ligands: CSO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PTH_VIBCH The natural substrate for this enzyme may be peptidyl-tRNAs which drop off the ribosome during protein synthesis. Publication Abstract from PubMed Bacterial peptidyl-tRNA hydrolase (Pth; EC 3.1.1.29) hydrolyzes the peptidyl-tRNAs accumulated in the cytoplasm and thereby prevents cell death by alleviating tRNA starvation. X-ray and NMR studies of Vibrio cholerae Pth (VcPth) and mutants of its key residues involved in catalysis show that the activity and selectivity of the protein depends on the stereochemistry and dynamics of residues H24, D97, N118, and N14. D97-H24 interaction is critical for activity because it increases the nucleophilicity of H24. The N118 and N14 have orthogonally competing interactions with H24, both of which reduce the nucleophilicity of H24 and are likely to be offset by positioning of a peptidyl-tRNA substrate. The region proximal to H24 and the lid region exhibit slow motions that may assist in accommodating the substrate. Helix alpha3 exhibits a slow wobble with intermediate time scale motions of its N-cap residue N118, which may work as a flypaper to position the scissile ester bond of the substrate. Overall, the dynamics of interactions between the side chains of N14, H24, D97, and N118, control the catalysis of substrate by this enzyme. Unraveling the stereochemical and dynamic aspects of the catalytic site of bacterial peptidyl-tRNA hydrolase.,Kabra A, Shahid S, Pal RK, Yadav R, Pulavarti SV, Jain A, Tripathi S, Arora A RNA. 2017 Feb;23(2):202-216. doi: 10.1261/rna.057620.116. Epub 2016 Nov 10. PMID:28096445 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Peptidyl-tRNA hydrolase

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