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• W2002792273 abstract "Time-resolved resonance Raman spectroscopy is used to obtain chromophore vibrational spectra of the pR, pB', and pB intermediates during the photocycle of photoactive yellow protein. In the pR spectrum, the C8-C9 stretching mode at 998 cm(-1) is approximately 60 cm(-1) lower than in the dark state, and the combination of C-O stretching and C7H=C8H bending at 1283 cm(-1) is insensitive to D2O substitution. These results indicate that pR has a deprotonated, cis chromophore structure and that the hydrogen bonding to the chromophore phenolate oxygen is preserved and strengthened in the early photoproduct. However, the intense C7H=C8H hydrogen out-of-plane (HOOP) mode at 979 cm(-1) suggests that the chromophore in pR is distorted at the vinyl and adjacent C8-C9 bonds. The formation of pB' involves chromophore protonation based on the protonation state marker at 1174 cm(-1) and on the sensitivity of the COH bending at 1148 cm(-1) as well as the combined C-OH stretching and C7H=C8H bending mode at 1252 cm(-1) to D2O substitution. The hydrogen out-of-plane Raman intensity at 985 cm(-1) significantly decreases in pB', suggesting that the pR-to-pB' transition is the stage where the stored photon energy is transferred from the distorted chromophore to the protein, producing a more relaxed pB' chromophore structure. The C=O stretching mode downshifts from 1660 to 1651 cm(-1) in the pB'-to-pB transition, indicating the reformation of a hydrogen bond to the carbonyl oxygen. Based on reported x-ray data, this suggests that the chromophore ring flips during the transition from pB' to pB. These results confirm the existence and importance of the pB' intermediate in photoactive yellow protein receptor activation." @default.
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• W2002792273 date "2004-04-01" @default.
• W2002792273 modified "2023-09-30" @default.
• W2002792273 title "Time-Resolved Resonance Raman Structural Studies of the pB′ Intermediate in the Photocycle of Photoactive Yellow Protein" @default.
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• W2002792273 doi "https://doi.org/10.1016/s0006-3495(04)74294-0" @default.
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