5ell

Crystal structure of L-aspartate/glutamate-specific racemase from Escherichia coli

spinqualitylabelsall models 5ell, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ell is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.801Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function C3SWD2_ECOLX Publication Abstract from PubMed We determined the crystal structure of EcL-DER to elucidate protein function and substrate specificity. Unlike other asp/glu racemases, EcL-DER has an unbalanced pair of catalytic residues, Thr83/Cys197, at the active site that is crucial for l- to d-unidirectional racemase activity. EcL-DER exhibited racemase activity for both l-glutamate and l-aspartate, but had threefold higher activity for l-glutamate. Based on the structure of the EcL-DER(C197S) mutant in complex with l-glutamate, we determined the binding mode of the l-glutamate substrate in EcL-DER and provide a structural basis for how the protein utilizes l-glutamate as a main substrate. The unidirectionality, despite an equilibrium constant of unity, can be understood in terms of the Haldane relationship. Structural basis for an atypical active site of an l-aspartate/glutamate-specific racemase from Escherichia coli.,Ahn JW, Chang JH, Kim KJ FEBS Lett. 2015 Dec 21;589(24 Pt B):3842-7. doi: 10.1016/j.febslet.2015.11.003., Epub 2015 Nov 7. PMID:26555188 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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