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Titolo:
Determination of iron-ligand bond lengths in ferric and ferrous horse heart cytochrome c using multiple scattering analyses of XAFS data
Autore:
Cheng, MC; Rich, AM; Armstrong, RS; Ellis, PJ; Lay, PA;
Indirizzi:
Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia Univ Sydney Sydney NSWAustralia 2006 h Chem, Sydney, NSW 2006, Australia
Titolo Testata:
INORGANIC CHEMISTRY
fascicolo: 25, volume: 38, anno: 1999,
pagine: 5703 - 5708
SICI:
0020-1669(199912)38:25<5703:DOIBLI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ABSORPTION FINE-STRUCTURE; FERRICYTOCHROME-C; EXAFS DATA; RESOLUTION; COMPLEXES; SPECTROSCOPY; MYOGLOBIN; FEATURES; EDGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Lay, PA Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 Sydney, NSW 2006, Australia
Citazione:
M.C. Cheng et al., "Determination of iron-ligand bond lengths in ferric and ferrous horse heart cytochrome c using multiple scattering analyses of XAFS data", INORG CHEM, 38(25), 1999, pp. 5703-5708

Abstract

X-ray absorption fine structure (XAFS) data were obtained from frozen aqueous solutions (10 K) of horse heart ferri- and ferrocyt c. Models of the structure about the Fe center were refined to optimize the fit between the observed XAFS in the range 0 less than or equal to k less than or equal to 16.3 Angstrom(-1) and the XAFS calculated using both single-scattering (SS) and multiple-scattering (MS) calculations. The bond lengths obtained are more accurate and precise than those determined previously for cyt c from various species using X-ray crystallography. The Fe-N bond lengths are 1.98-1.99 Angstrom for both oxidation states of cyt c. The Fe-S bond of ferricyt c (2.33 Angstrom) is significantly longer than that of ferrocyt c (2.29 Angstrom). The small changes in the bond lengths are consistent with the small reorganizational energy required for the fast electron-transfer reaction of cyt c.

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Documento generato il 02/12/20 alle ore 08:12:48