3o72

Crystal structure of EfeB in complex with heme

spinqualitylabelsall models 3o72, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3o72 is a 4 chain structure with sequence from Escherichia coli O157:H7 str. TW14359. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.95Å Ligands: HEM, MSE, OXY Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed EfeB/YcdB is a member of the dye-decolorizing peroxidase (DyP) protein family. Recent study has shown that this protein can extract iron from heme without breaking the tetrapyrrole ring. We report the crystal structure of EfeB from E. coli O157 bound to heme at 1.95 Aresolution. The EfeB monomer contains two domains. The heme molecule is located in a large hydrophobic pocket in the C-terminal domain. A long loop connecting the two domains extensively interacts with the heme, which is a distinctive structural feature of EfeB homologues. A large tunnel formed by this loop and the beta-sheet of C-terminal domain provides a potential cofactor/substrate binding site. Biochemical data show that the production of protoporphyrin IX (PPIX) is closely related to the peroxidation activity. The mutant D235N keeps nearly the same activity of guaiacol peroxidase as the wild type protein, while the corresponding mutation in the classic DyP protein family completely abolishes the peroxidation activity. These results suggest that EfeB is a unique member of the DyP protein family. In addition, dramatically enhanced fluorescence excitation and emission of EfeB-PPIX was observed, implying this protein may be used as a red color fluorescence marker. Crystal structure and biochemical features of EfeB/YcdB from Escherichia coli O157: Asp235 plays divergent roles in different enzyme-catalyzed processes.,Liu X, Du Q, Wang Z, Zhu D, Huang Y, Li N, Wei T, Xu S, Gu L J Biol Chem. 2011 Feb 15. PMID:21324904 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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