1qj4
From Proteopedia
HYDROXYNITRILE-LYASE FROM HEVEA BRASILIENSIS AT ATOMIC RESOLUTION
Structural highlights
FunctionHNL_HEVBR Involved in cyanogenesis, the release of HCN from injured tissues. Decomposes a varieties of (R) or (S) cyanohydrins into HCN and the corresponding aldehydes and ketones. The natural substrate of this enzyme is (S)-acetone cyanohydrin. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe X-ray crystal structure of native hydroxynitrile lyase from Hevea brasiliensis (Hb-HNL) has been determined at 1.1 A resolution. It refined to a final R of 11.5% for all data and an Rfree of 14.4%. The favorable data-to-parameter ratio at atomic resolution made the refinement of individual anisotropic displacement parameters possible. The data also allowed a clear distinction of the alternate orientations of all histidine and the majority of asparagine and glutamine side chains. A number of hydrogen atoms, including one on the imidazole of the mechanistically important His-235, became visible as peaks in a difference electron density map. The structure revealed a discretely disordered sidechain of Ser-80, which is part of the putative catalytic triad. Analysis of the anisotropy indicated an increased mobility of residues near the entrance to the active site and within the active site. Atomic resolution crystal structure of hydroxynitrile lyase from Hevea brasiliensis.,Gruber K, Gugganig M, Wagner UG, Kratky C Biol Chem. 1999 Jul-Aug;380(7-8):993-1000. PMID:10494852[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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