6qk0

R2-like ligand-binding oxidase E69D mutant with anaerobically reconstituted Mn/Fe cofactor

spinqualitylabelsall models 6qk0, resolution 2.09Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6qk0 is a 2 chain structure with sequence from Geobacillus kaustophilus HTA426. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.091Å Ligands: FE2, MN, PLM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q5KW80_GEOKA Publication Abstract from PubMed Heterobimetallic Mn/Fe proteins represent a new cofactor paradigm in bioinorganic chemistry and pose countless outstanding questions. The assembly of the active site defies common chemical convention by contradicting the Irving-Williams series, while the scope of reactivity remains unexplored. In this work, the assembly and C-H bond activation process in the Mn/Fe R2-like ligand-binding oxidase (R2lox) protein is investigated using a suite of biophysical techniques, including time-resolved optical spectroscopy, global kinetic modeling, X-ray crystallography, electron paramagnetic resonance spectroscopy, protein electrochemistry, and mass spectrometry. Selective metal binding is found to be under thermodynamic control, with the binding sites within the apo-protein exhibiting greater Mn(II) affinity than Fe(II) affinity. The comprehensive analysis of structure and reactivity of wild-type R2lox and targeted primary and secondary sphere mutants indicate that the efficiency of C-H bond activation directly correlates with the Mn/Fe cofactor reduction potentials and is inversely related to divalent metal binding affinity. These findings suggest the R2lox active site is precisely tuned for achieving both selective heterobimetallic binding and high levels of reactivity and offer a mechanism to examine the means by which proteins achieve appropriate metal incorporation. Key Structural Motifs Balance Metal Binding and Oxidative Reactivity in a Heterobimetallic Mn/Fe Protein.,Kisgeropoulos EC, Griese JJ, Smith ZR, Branca RMM, Schneider CR, Hogbom M, Shafaat HS J Am Chem Soc. 2020 Mar 18;142(11):5338-5354. doi: 10.1021/jacs.0c00333. Epub, 2020 Mar 9. PMID:32062969 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonucleotide reductase 3D structures

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