6z4r

sperm whale myoglobin mutant (H64V V64A) bearing the non-canonical amino acid 3-thienylalanine as axial heme ligand

spinqualitylabelsall models 6z4r, resolution 1.96Å 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 1.96Å Ligands: HEM, Q78 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Changing the primary metal coordination sphere is a powerful strategy for tuning metalloprotein properties. Here we used amber stop codon suppression with engineered pyrrolysyl-tRNA synthetases, including two newly evolved enzymes, to replace the proximal histidine in myoglobin with N delta -methylhistidine, 5-thiazoyl-alanine, 4-thiazoylalanine and 3-(3-thienyl)alanine. In addition to tuning the heme redox potential over a >200 mV range, these noncanonical ligands modulate the protein's carbene transfer activity with ethyl diazoacetate. Variants with increased reduction potential proved superior for cyclopropanation and N-H insertion, whereas variants with reduced E o values gave higher S-H insertion activity. Given the functional importance of histidine in many enzymes, these genetically encoded analogues could be valuable tools for probing mechanism and enabling new chemistries. Noncanonical heme ligands steer carbene transfer reactivity in an artificial metalloenzyme.,Pott M, Tinzl M, Hayashi T, Ota Y, Dunkelmann D, Mittl PRE, Hilvert D Angew Chem Int Ed Engl. 2021 Apr 20. doi: 10.1002/anie.202103437. PMID:33880851 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Myoglobin 3D structures

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