3wnu

The crystal structure of catalase-peroxidase, KatG, from Synechococcus PCC7942

spinqualitylabelsall models 3wnu, resolution 2.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wnu is a 1 chain structure with sequence from Synechococcus elongatus PCC 7942 = FACHB-805. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.2Å Ligands: NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function KATG_SYNE7 Bifunctional enzyme with both catalase and broad-spectrum peroxidase activity.[HAMAP-Rule:MF_01961] Publication Abstract from PubMed The crystal structure of catalase-peroxidase from Synechococcus elongatus PCC7942 (SeKatG) was solved by molecular replacement and refined to an Rwork of 16.8% and an Rfree of 20.6% at 2.2 A resolution. The asymmetric unit consisted of only one subunit of the catalase-peroxidase molecule, including a protoporphyrin IX haem moiety and two sodium ions. A typical KatG covalent adduct was formed, Met248-Tyr222-Trp94, which is a key structural element for catalase activity. The crystallographic equivalent subunit was created by a twofold symmetry operation to form the functional dimer. The overall structure of the dimer was quite similar to other KatGs. One sodium ion was located close to the proximal Trp314. The location and configuration of the proximal cation site were very similar to those of typical peroxidases such as ascorbate peroxidase. These features may provide a structural basis for the behaviour of the radical localization/delocalization during the course of the enzymatic reaction. The 2.2 A resolution structure of the catalase-peroxidase KatG from Synechococcus elongatus PCC7942.,Kamachi S, Wada K, Tamoi M, Shigeoka S, Tada T Acta Crystallogr F Struct Biol Commun. 2014 Mar;70(Pt 3):288-93. doi:, 10.1107/S2053230X14002052. Epub 2014 Feb 19. PMID:24598912 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Catalase 3D structures

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