Elucidating the Molecular Mechanism of Ultrafast Pfr-State Photoisomerization in Bathy Bacteriophytochrome PaBphP.

ABSTRACT: Bacteriophytochromes are photoreceptors that regulate various physiological processes induced by photoisomerization in a linear tetrapyrrole chromophore upon red/far-red light absorption. Here, we investigate the photoinduced Pfr-state isomerization mechanism of a bathy bacteriophytochrome from Pseudomonas aeruginosa combining femtosecond-resolved fluorescence and absorption methods. We observed initial coherent oscillation motions in the first 1 ps with low-frequency modes below 60 cm^-1, then a bifurcation of the wavepacket with the distinct excited-state lifetimes in a few picoseconds, and finally chromophore-protein coupled ground-state conformational evolution on nanosecond time scales. Together with systematic mutational studies, we revealed the critical roles of hyd

SUBMITTER: Wang D 

PROVIDER: S-EPMC7268903 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature