7kqt

A 1.84-A resolution crystal structure of heme-dependent L-tyrosine hydroxylase in complex with 3-fluoro-L-tyrosine and cyanide

spinqualitylabelsall models 7kqt, resolution 1.83Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.835Å Ligands: CYN, HEM, TRS, YOF Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The heme-dependent l-tyrosine hydroxylases (TyrHs) in natural product biosynthesis constitute a new enzyme family in contrast to the nonheme iron enzymes for DOPA production. A representative TyrH exhibits dual reactivity of C-H and C-F bond cleavage when challenged with 3-fluoro-l-tyrosine (3-F-Tyr) as a substrate. However, little is known about how the enzyme mediates two distinct reactions. Herein, a new TyrH from the thermophilic bacterium Streptomyces sclerotialus (SsTyrH) was functionally and structurally characterized. A de novo crystal structure of the enzyme-substrate complex at 1.89-A resolution provides the first comprehensive structural study of this hydroxylase. The binding conformation of l-tyrosine indicates that C-H bond hydroxylation is initiated by electron transfer. Mutagenesis studies confirmed that an active site histidine, His88, participates in catalysis. We also obtained a 1.68-A resolution crystal structure in complex with the monofluorinated substrate, 3-F-Tyr, which shows one binding conformation but two orientations of the fluorine atom with a ratio of 7:3, revealing that the primary factor of product distribution is the substrate orientation. During in crystallo reaction, a ferric-hydroperoxo intermediate (compound 0, Fe(3+)-OOH) was observed with 3-F-Tyr as a substrate based on characteristic spectroscopic features. We determined the crystal structure of this compound 0-type intermediate and refined it to 1.58-A resolution. Collectively, this study provided the first molecular details of the heme-dependent TyrH and determined the primary factor that dictates the partitioning between the dual reactivities of C-H and C-F bond activation. Molecular Rationale for Partitioning between C-H and C-F Bond Activation in Heme-Dependent Tyrosine Hydroxylase.,Wang Y, Davis I, Shin I, Xu H, Liu A J Am Chem Soc. 2021 Mar 18. doi: 10.1021/jacs.1c00175. PMID:33734681 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hydroxylases 3D structures

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