3mjo | pdb_00003mjo

Small subunit (R2F) of native ribonucleotide reductase from Corynebacterium ammoniagenes

spinqualitylabelsall models 3mjo, resolution 1.36Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3mjo is a 2 chain structure with sequence from "bacterium_ammoniagenes"_cooke_and_keith_1927 "bacterium ammoniagenes" cooke and keith 1927. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MN3 Gene: nrdF ("Bacterium ammoniagenes" Cooke and Keith 1927) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [O69274_CORAM] Provides the precursors necessary for DNA synthesis. Catalyzes the biosynthesis of deoxyribonucleotides from the corresponding ribonucleotides (By similarity).[PIRNR:PIRNR000355] 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 PubMed The X-ray crystallographic structure of the native R2F subunit of the ribonucleotide reductase (RNR) of Corynebacterium ammoniagenes ATCC 6872 is reported, with a resolution of 1.36 A. The metal site contains an oxo/hydroxo-bridged manganese dimer, located near a tyrosine residue (Y115). The coordination of the manganese dimer and its distance to a nearby tyrosine residue resemble the di-iron metalloradical cofactor of class I RNR from Escherichia coli . Multifrequency EPR measurements of the highly active C. ammoniagenes R2F subunit show that the metal site contains a ferromagnetically exchange-coupled Mn(III)Mn(III) dimer weakly coupled to a tyrosyl radical. A mechanism for the metalloradical cofactor (Mn(III)Mn(III)Y(*)) generation is proposed. H(2)O(2) (HO(2)(-)) instead of O(2) is hypothesized as physiological oxidant for the Mn dimer which in turn oxidizes the tyrosine Y115. Changes in the ligand sphere of both manganese ions during metalloradical generation direct the complex formation of this cofactor, disfavoring alternate reaction pathways such as H(2)O(2) dismutation, as observed for manganese catalase, a structural analogue of the R2F metal site. The presented results demonstrate the importance of manganese for radical formation in this RNR and confirm the assignment of this enzyme to class Ib. A tyrosyl-dimanganese coupled spin system is the native metalloradical cofactor of the R2F subunit of the ribonucleotide reductase of Corynebacterium ammoniagenes.,Cox N, Ogata H, Stolle P, Reijerse E, Auling G, Lubitz W J Am Chem Soc. 2010 Aug 18;132(32):11197-213. PMID:20698687 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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