1ofw

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Three dimensional structure of the oxidized form of nine heme cytochrome c at PH 7.5

Structural highlights

1ofw is a 2 chain structure with sequence from Desulfovibrio desulfuricans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.5Å
Ligands:ACT, GOL, HEC
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CYC9_DESDA May form part of a transmembrane redox complex through which electrons are transferred to the cytoplasm for reduction of sulfate.

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 nine-heme cytochrome c is a monomeric multiheme cytochrome found in Desulfovibrio desulfuricans ATCC 27774. The polypeptide chain comprises 296 residues and wraps around nine hemes of type c. It is believed to take part in the periplasmic assembly of proteins involved in the mechanism of hydrogen cycling, receiving electrons from the tetraheme cytochrome c3. With the purpose of understanding the molecular basis of electron transfer processes in this cytochrome, we have determined the crystal structures of its oxidized and reduced forms at pH 7.5 and performed theoretical calculations of the binding equilibrium of protons and electrons in these structures. This integrated study allowed us to observe that the reduction process induced relevant conformational changes in several residues, as well as protonation changes in some protonatable residues. In particular, the surroundings of hemes I and IV constitute two areas of special interest. In addition, we were able to ascertain the groups involved in the redox-Bohr effect present in this cytochrome and the conformational changes that may underlie the redox-cooperativity effects on different hemes. Furthermore, the thermodynamic simulations provide evidence that the N- and C-terminal domains function in an independent manner, with the hemes belonging to the N-terminal domain showing, in general, a lower redox potential than those found in the C-terminal domain. In this way, electrons captured by the N-terminal domain could easily flow to the C-terminal domain, allowing the former to capture more electrons. A notable exception is heme IX, which has low redox potential and could serve as the exit path for electrons toward other proteins in the electron transfer pathway.

Redox-Bohr and other cooperativity effects in the nine-heme cytochrome C from Desulfovibrio desulfuricans ATCC 27774: crystallographic and modeling studies.,Bento I, Teixeira VH, Baptista AM, Soares CM, Matias PM, Carrondo MA J Biol Chem. 2003 Sep 19;278(38):36455-69. Epub 2003 May 15. PMID:12750363[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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Citations
2 reviews cite this structure
Soares et al. (2012)
No citations found

See Also

References

  1. Bento I, Teixeira VH, Baptista AM, Soares CM, Matias PM, Carrondo MA. Redox-Bohr and other cooperativity effects in the nine-heme cytochrome C from Desulfovibrio desulfuricans ATCC 27774: crystallographic and modeling studies. J Biol Chem. 2003 Sep 19;278(38):36455-69. Epub 2003 May 15. PMID:12750363 doi:10.1074/jbc.M301745200

Contents


PDB ID 1ofw

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