Spectroscopy and reactivity of a photogenerated tryptophan radical in a structurally defined protein environment.
Spectroscopy and reactivity of a photogenerated tryptophan radical in a structurally defined protein environment.
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结构明确的蛋白质环境中光生色氨酸自由基的光谱和反应性。
DOI:
10.1021/ja037203i
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发表时间:
2003
影响因子:
15
通讯作者:
Gray,HarryB
中科院分区:
文献类型:
--
作者:
Miller,JeremiahE;Gradinaru,Cristian;Crane,BrianR;DiBilio,AngelJ;Wehbi,WilliamA;Un,Sun;Winkler,JayR;Gray,HarryB
Near-UV irradiation of structurally characterized [Re(I)(CO)3(1,10-phenanthroline)(Q107H)](W48F/Y72F/H83Q/Y108W)AzM(II) [Az =Pseudomonasaeruginosaazurin, M = Cu, Zn]/[Co(NH3)5Cl]Cl2produces a tryptophan radical (W108•) with unprecedented kinetic stability. After rapid formation (k= 2.8 × 106s-1), the radical persists for more than 5 h at room temperature in the folded ReAzM(II) structure. The absorption spectrum of ReAz(W108•)M(II) exhibits maxima at 512 and 536 nm. Oxidation of K4[Mo(CN)8] by ReAz(W108•)Zn(II) places the W108•/W108 reduction potential in the protein above 0.8 V vs NHE.