6pab | pdb_00006pab

E. coli L-asparaginase II in complex with L-Asp at pH 7.0

spinqualitylabelsall models 6pab, resolution 1.73Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6pab is a 4 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.73Å Ligands: ASP, CIT, IMD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ASPG2_ECOLI Publication Abstract from PubMed Twenty crystal structures of the complexes of l-asparaginase with l-Asn, l-Asp, and succinic acid that are currently available in the Protein Data Bank, as well as 11 additional structures determined in the course of this project, were analyzed in order to establish the level of conservation of the geometric parameters describing interactions between the substrates and the active site of the enzymes. We found that such stereochemical relationships are highly conserved, regardless of the organism from which the enzyme was isolated, specific crystallization conditions, or the nature of the ligands. Analysis of the geometry of the interactions, including Burgi-Dunitz and Flippin-Lodge angles, indicated that Thr12 (Escherichia coli asparaginase II numbering) is optimally placed to be the primary nucleophile in the most likely scenario utilizing a double-displacement mechanism, whereas catalysis through a single-displacement mechanism appears to be the least likely. Geometric considerations support the double-displacement catalytic mechanism of l-asparaginase.,Lubkowski J, Wlodawer A Protein Sci. 2019 Oct;28(10):1850-1864. doi: 10.1002/pro.3709. Epub 2019 Aug 29. PMID:31423681 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Asparaginase 3D structures

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