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- W4229365870 abstract "Protein structural dynamics can span many orders of magnitude in time. Photoactive yellow protein's (PYP) reversible photocycle encompasses picosecond isomerization of the light-absorbing chromophore as well as large scale protein backbone motions occurring on a millisecond timescale. Femtosecond-to-millisecond time-resolved mid-infrared spectroscopy is employed here to uncover structural details of photocycle intermediates up to chromophore protonation and the first structural changes leading to the formation of the partially unfolded signaling state pB. The data show that a commonly thought stable transient photocycle intermediate is actually formed after a sequence of several smaller structural changes. We provide residue-specific spectroscopic evidence that protonation of the chromophore on a few hundreds of microseconds timescale is delayed with respect to deprotonation of the nearby E46 residue. That implies that the direct proton donor is not E46 but most likely a water molecule. Such details may assist the ongoing photocycle and protein folding simulation efforts on the complex and wide time-spanning photocycle of the model system PYP." @default.
- W4229365870 created "2022-05-10" @default.
- W4229365870 creator A5070800561 @default.
- W4229365870 creator A5076681929 @default.
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- W4229365870 date "2022-05-28" @default.
- W4229365870 modified "2023-10-14" @default.
- W4229365870 title "Femtosecond-to-millisecond mid-IR spectroscopy of photoactive yellow protein uncovers structural micro-transitions of the chromophore’s protonation mechanism" @default.
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- W4229365870 doi "https://doi.org/10.1063/5.0091918" @default.
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