Determination of iron-ligand bond lengths in ferric and ferrous horse heart cytochrome c using multiple scattering analyses of XAFS data

被引：31

作者：

Cheng, MC ^{[1
]}

Rich, AM ^{[1
]}

Armstrong, RS ^{[1
]}

Ellis, PJ ^{[1
]}

Lay, PA ^{[1
]}

机构：

[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia

来源：

INORGANIC CHEMISTRY | 1999年 / 38卷 / 25期

关键词：

D O I：

10.1021/ic990395r

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：5703 / 5708

页数：6

共 38 条

[31] Determination of the Fe-ligand bond lengths and Fe-N-O bond angles in horse heart ferric and ferrous nitrosylmyoglobin using multiple-scattering XAFS analyses [J].