1wr5

Three dimensional Structure of the E41K mutant of Tetraheme Cytochrome c3 from Desulfovibrio vulgaris Miyazaki F

spinqualitylabelsall models 1wr5, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1wr5 is a 1 chain structure with sequence from Desulfovibrio vulgaris str. 'Miyazaki F'. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.4Å Ligands: EOH, HEC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CYC3_NITV9 Participates in sulfate respiration coupled with phosphorylation by transferring electrons from the enzyme dehydrogenase to ferredoxin. 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 Tyrosine 43 is positioned parallel to the fifth heme axial ligand, His34, of heme 1 in the tetraheme cytochrome c(3). The replacement of tyrosine with leucine increased the redox potential of heme 1 by 44 and 35 mV at the first and last reduction steps, respectively; its effects on the other hemes are small. In contrast, the Y43F mutation hardly changed the potentials. It shows that the aromatic ring at this position contributes to lowering the redox potential of heme 1 locally, although this cannot be the major contribution to the extremely low redox potentials of cytochrome c(3). Furthermore, temperature-dependent line-width broadening in partially reduced samples established that the aromatic ring at position 43 participates in the control of the kinetics of intramolecular electron transfer. The rate of reduction of Y43L cytochrome c(3) by 5-deazariboflavin semiquinone under partially reduced conditions was significantly different from that of the wild type in the last stage of the reduction, supporting the involvement of Tyr43 in regulation of reduction kinetics. The mutation of Y43L, however, did not induce a significant change in the crystal structure. Role of the aromatic ring of Tyr43 in tetraheme cytochrome c(3) from Desulfovibrio vulgaris Miyazaki F.,Ozawa K, Takayama Y, Yasukawa F, Ohmura T, Cusanovich MA, Tomimoto Y, Ogata H, Higuchi Y, Akutsu H Biophys J. 2003 Nov;85(5):3367-74. PMID:14581238 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome C 3D structures

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