Effect of solution viscosity on intraprotein electron transfer between the FMN and heme domains in inducible nitric oxide synthase.

Effect of solution viscosity on intraprotein electron transfer between the FMN and heme domains in inducible nitric oxide synthase.
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DOI:
10.1016/j.febslet.2011.07.022
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发表时间:
2011-08-19
期刊:
影响因子:
3.5
通讯作者:
Feng C
Feng C
中科院分区:
生物学3区
文献类型:
--
作者:
Li W;Fan W;Elmore BO;Feng C

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人iNOS加氧酶/FMN构建体中的FMN-血红素蛋白内电子转移(IET)动力学通过激光闪光光解作为溶液粘度(1.0-3.0 cP)的函数来测定。在乙二醇或蔗糖的存在下,一个明显的IET速率常数值的减少,观察到在溶液粘度的增加。对于两种粘原,IET速率常数与粘度成正比。这表明,粘度,而不是添加的增粘剂的其他性质,导致IET速率对溶剂浓度的依赖性。IET动力学和黄素荧光结果表明,FMN血红素IET在iNOS门控的FMN结构域的大的构象变化,和对接FMN/血红素状态是短暂的填充。
The FMN–heme intraprotein electron transfer (IET) kinetics in a human iNOS oxygenase/FMN construct were determined by laser flash photolysis as a function of solution viscosity (1.0–3.0 cP). In the presence of ethylene glycol or sucrose, an appreciable decrease in the IET rate constant value was observed with an increase in the solution viscosity. The IET rate constant is inversely proportional to the viscosity for both viscosogens. This indicates that viscosity, and not other properties of the added viscosogens, causes the dependence of IET rates on the solvent concentration. The IET kinetics and flavin fluorescence results indicate that the FMN–heme IET in iNOS is gated by a large conformational change of the FMN domain, and that the docked FMN/heme state is populated transiently.
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发表时间: 2006-09-01
影响因子: 3
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