Spectroscopic characterization of YedY: the role of sulfur coordination in a Mo(V) sulfite oxidase family enzyme form.
Spectroscopic characterization of YedY: the role of sulfur coordination in a Mo(V) sulfite oxidase family enzyme form.
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YedY 的光谱表征:Mo(V) 亚硫酸盐氧化酶家族酶形式中硫配位的作用。
DOI:
10.1021/ja903087k
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发表时间:
2009
影响因子:
15
通讯作者:
Kirk,MartinL
中科院分区:
文献类型:
--
作者:
Yang,Jing;Rothery,Richard;Sempombe,Joseph;Weiner,JoelH;Kirk,MartinL
Electronic paramagnetic resonance (EPR), electronic absorption, and magnetic circular dichroism spectroscopies have been performed on YedY, a SUOX fold protein with a Mo domain that is remarkably similar to that found in chicken sulfite oxidase,Arabidopsis thalianaplant sulfite oxidase, and the bacterial sulfite dehydrogenase fromStarkeya novella. Low-energy dithiolene → Mo and cysteine thiolate → Mo charge-transfer bands have been assigned for the first time in a Mo(V) form of a SUOX fold protein, and the spectroscopic data have been used to interpret the results of bonding calculations. The analysis shows that second coordination sphere effects modulate dithiolene and cysteine sulfur covalency contributions to the Mo bonding scheme. In particular, a more acute Ooxo−Mo−SCys−C dihedral angle results in increased cysteine thiolate S → Mo charge transfer and a largeg1in the EPR spectrum. The spectrosocopic results, coupled with the available structural data, indicate that these second coordination sphere effects may play key roles in modulating the active-site redox potential, facilitating hole superexchange pathways for electron transfer regeneration, and affecting the type of reactions catalyzed by sulfite oxidase family enzymes.
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DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
Frank Inscore;Hemant Joshi;Anne E. McElhaney;J. Enemark
通讯作者:
J. Enemark
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
G. L. Wilson;R. Greenwood;J. Pilbrow;J. T. Spence;A. G. Wedd
通讯作者:
A. G. Wedd
影响因子:
12.9
作者:
Gregory J. Workun;Kamila Moquin;R. Rothery;J. Weiner
通讯作者:
Gregory J. Workun;Kamila Moquin;R. Rothery;J. Weiner
影响因子:
15
作者:
Peariso, K;McNaughton, RL;Kirk, ML
通讯作者:
Kirk, ML
影响因子:
5.7
作者:
R. Hille
通讯作者:
R. Hille