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
Gray,HarryB
中科院分区:
化学1区
文献类型:
--
作者:
Miller,JeremiahE;Gradinaru,Cristian;Crane,BrianR;DiBilio,AngelJ;Wehbi,WilliamA;Un,Sun;Winkler,JayR;Gray,HarryB

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结构表征的[Re(I)(CO)3(1,10-phenanthroline)(Q107 H)](W 48 F/Y 72 F/H83 Q/Y108 W)AzM(II)[Az = Pseudomonasaerosaazurin,M = Cu,Zn]/[Co(NH3)5Cl] Cl 2在近紫外照射下产生具有前所未有的动力学稳定性的色氨酸自由基(W108·)。自由基快速形成后(k= 2.8 × 106 s-1),在室温下折叠的ReAzM(II)结构中,自由基的存在时间大于5 h。ReAz(W108·)M(II)的最大吸收波长为512和536 nm。K4[Mo(CN)8]被ReAz(W108·)Zn(II)氧化使蛋白质中的W108·/W108还原电位高于0.8 V(相对于NHE)。
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.