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- W2534975530 abstract "The regulatory mechanism of state transitions was studied in Chlamydomonas reinhardtii (C.r.) wild type (WT) as well as mutant strains deficient in the photosystem I (PSI) or the photosystem II (PSII) core. Time-resolved fluorescence measurements were obtained on instantly frozen cells incubated beforehand in the dark in aerobic or anaerobic conditions which leads to state 1 (S1) or state 2 (S2). WT data contains information on the light-harvesting complex (LHC) connected to PSI and PSII. The mutants' data contain information on either LHCII-LHCI-PSI or LHCII-PSII, plus information on LHC antennas devoid of a PS core. In a simultaneous analysis of the data from all strains under S1 or S2 conditions a unified model for the excited state dynamics at 77 K was created. This yielded the completely resolved LHCII-LHCI-PSI and LHCII-PSII dynamics and quantified the state transitions. In WT cells the fraction of light absorbed by LHCII connected to PSII decreases from 45% in S1 to 29% in S2, while it increases from 0% to 16% for LHCII connected to PSI. Thus (16/45 =) 36% of all LHCII is involved in the state transition. In the mutant strains deficient in the PSI core, the red most species peaking at 716 nm disappears completely, indicating that this far red Chl pigment is located in the PSI core. In the mutant strain deficient in the PSII core, red shifted species with maxima at 684 and 686 nm appear in the LHCII antenna. LHCII-684 is quenched and decays with a rate of (310 ps)− 1." @default.
- W2534975530 created "2016-10-28" @default.
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- W2534975530 date "2017-01-01" @default.
- W2534975530 modified "2023-10-05" @default.
- W2534975530 title "A model for the 77 K excited state dynamics in Chlamydomonas reinhardtii in state 1 and state 2" @default.
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- W2534975530 doi "https://doi.org/10.1016/j.bbabio.2016.10.001" @default.
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