期刊
JOURNAL OF INORGANIC BIOCHEMISTRY
卷 105, 期 6, 页码 806-811出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2011.03.004
关键词
ETPFd; Ferredoxin; Schizosaccharomyces pombe; Ser mutants; Electron-transfer; Fd reductase
资金
- National Institutes of Health [AI072443]
- Ministero dell'Universita e della Ricerca (MIUR) of Italy [2007KAWXCL_001]
Schizosaccharomyces pombe (Sp) ferredoxin contains a C-terminal electron transfer protein ferredoxin domain (etp(Fd)) that is homologous to adrenodoxin. The ferredoxin has been characterized by spectroelectrochemical methods, and Mossbauer, UV-Vis and circular dichroism spectroscopies. The Mossbauer spectrum is consistent with a standard diferric [2Fe-2S](2+) cluster. While showing sequence homology to vertebrate ferredoxins, the E degrees' and the reduction thermodynamics for etp(Fd) (-0.392 V) are similar to plant-type ferredoxins. Relatively stable Cys to Set derivatives were made for each of the four bound Cys residues and variations in the visible spectrum in the 380-450 nm range were observed that are characteristic of oxygen ligated clusters, including members of the [2Fe-2S] cluster IscU/ISU scaffold proteins. Circular dichroism spectra were similar and consistent with no significant structural change accompanying these mutations. All derivatives were active in an NADPH-Fd reductase cytochrome c assay. The binding affinity of Fd to the reductase was similar, however, V-max reflecting rate limiting electron transfer was found to decrease similar to 13-fold. The data are consistent with relatively minor perturbations of both the electronic properties of the cluster following substitution of the Fe-bond S atom with O, and the electronic coupling of the cluster to the protein. (C) 2011 Elsevier Inc. All rights reserved.
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