4z9f

Halohydrin hydrogen-halide-lyase, HheA

spinqualitylabelsall models 4z9f, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4z9f is a 8 chain structure with sequence from Corsp. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL Gene: hheA (CORSP) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Halohydrin hydrogen-halide-lyase (H-Lyase) is a bacterial enzyme that is involved in the degradation of halohydrins. This enzyme catalyzes the intramolecular nucleophilic displacement of a halogen by a vicinal hydroxyl group in halohydrins to produce the corresponding epoxides. The epoxide products are subsequently hydrolyzed by an epoxide hydrolase, yielding the corresponding 1, 2-diol. Until now, six different H-Lyases have been studied. These H-Lyases are grouped into three subtypes (A, B, and C) based on amino acid sequence similarities and exhibit different enantioselectivity. Corynebacterium sp. strain N-1074 has two different isozymes of H-Lyase, HheA (A-type) and HheB (B-type). We have determined their crystal structures to elucidate the differences in enantioselectivity among them. All three groups share a similar structure, including catalytic sites. The lack of enantioselectivity of HheA seems to be due to the relatively wide size of the substrate tunnel compared to that of other H-Lyases. Among the B-type H-Lyases, HheB shows relatively high enantioselectivity compared to that of HheBGP1 . This difference seems to be due to amino acid replacements at the active site tunnel. The binding mode of 1, 3-dicyano-2-propanol at the catalytic site in the crystal structure of the HheB-DiCN complex suggests that the product should be (R)-epichlorohydrin, which agrees with the enantioselectivity of HheB. Comparison with the structure of HheC provides a clue for the difference in their enantioselectivity. Proteins 2015; 83:2230-2239. (c) 2015 Wiley Periodicals, Inc. Crystal structures of halohydrin hydrogen-halide-lyases from Corynebacterium sp. N-1074.,Watanabe F, Yu F, Ohtaki A, Yamanaka Y, Noguchi K, Yohda M, Odaka M Proteins. 2015 Dec;83(12):2230-9. doi: 10.1002/prot.24938. Epub 2015 Oct 16. PMID:26422370 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Epoxidase 3D structures

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