期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 1, 页码 69-72出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz402396k
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资金
- National Science Foundation [CHE0748358]
- National Institute of Health [GM095997]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0748358, 1412033] Funding Source: National Science Foundation
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 10 tryptophans to the tryptophan cluster in 1-2 ns 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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