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- W3166353208 abstract "Phytochrome proteins are light receptors that play a pivotal role in regulating the life cycles of plants and microorganisms. Intriguingly, while cyanobacterial phytochrome Cph1 and cyanobacteriochrome AnPixJ use the same phycocyanobilin (PCB) chromophore to absorb light, their excited-state behavior is very different. We employ multiscale calculations to rationalize the different early photoisomerization mechanisms of PCB in Cph1 and AnPixJ. We found that their electronic S1 , T1 , and S0 potential minima exhibit distinct geometric and electronic structures due to different hydrogen bond networks with the protein environment. These specific interactions influence the S1 electronic structures along the photoisomerization paths, ultimately leading to internal conversion in Cph1 but intersystem crossing in AnPixJ. This explains why the excited-state relaxation in AnPixJ is much slower (ca. 100 ns) than in Cph1 (ca. 30 ps). Further, we predict that efficient internal conversion in AnPixJ can be achieved upon protonating the carboxylic group that interacts with PCB." @default.
- W3166353208 created "2021-06-22" @default.
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- W3166353208 date "2021-07-16" @default.
- W3166353208 modified "2023-09-25" @default.
- W3166353208 title "Hydrogen‐Bond Network Determines the Early Photoisomerization Processes of Cph1 and AnPixJ Phytochromes" @default.
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- W3166353208 doi "https://doi.org/10.1002/anie.202104853" @default.
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