Quenching Dynamics of Ultraviolet-Light Perception by UVR8 Photoreceptor.

Quenching Dynamics of Ultraviolet-Light Perception by UVR8 Photoreceptor.
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DOI:
10.1021/jz402396k
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发表时间:
2014-01-02
期刊:
The journal of physical chemistry letters
影响因子:
--
通讯作者:
Zhong D
Zhong D
中科院分区:
其他
文献类型:
--
作者:
Liu Z;Li X;Zhong FW;Li J;Wang L;Shi Y;Zhong D

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UVR8是最近发现的一种以同型二聚体为活性状态的UV-B光感受器。界面色氨酸 (W285) 的 UV-B 感知导致二聚体解离成两个功能单体。在这里,我们研究了 UVR8 中 W285 紫外线感知背后的分子机制。我们在界面四色氨酸簇内观察到约 150 ps 内的显着猝灭动力学,以及在 1-2 纳秒内从其他十个色氨酸到色氨酸簇的不寻常的共振能量转移,以提高功能效率。随着 W285 突变为 F,猝灭动力学在该完整突变二聚体中被高度抑制,总体荧光强度急剧增加 6 倍,表明 W285 作为主要猝灭剂。这些结果揭示了有效紫外线感知的独特能量转移机制,以及 W285 在初级猝灭动力学中启动二聚体解离以触发该功能的关键功能作用。
UVR8 is a recently discovered UV-B photoreceptor with a homodimer as the active state. UV-B perception of an interfacial tryptophan (W285) causes dissociation of the dimer into two functional monomers. Here, we investigate the molecular mechanism behind UV perception by W285 in UVR8. We observed a significant quenching dynamics in about 150 ps within the interfacial four-tryptophan cluster and an unusual resonance energy transfer from the other ten tryptophans to the tryptophan cluster in 1–2 nanoseconds to enhance functional efficiency. With mutation of W285 to F, the quenching dynamics is highly suppressed in this intact mutant dimer and the overall fluorescence intensity dramatically increases by a factor of 6, indicating W285 as a dominant quencher. These results reveal a unique energy transfer mechanism for efficient UV perception and the critical functional role of W285 for primary quenching dynamics for initiating dimer dissociation to trigger the function.
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