Open AccessFemtosecond visible transient absorption spectroscopy of chlorophyll- f -containing photosystem II
Author(s) -
Noura Zamzam,
R. Rakowski,
Marius Kaučikas,
Gabriel Dorlhiac,
Stefania Viola,
Dennis J. Nürnberg,
Andrea Fantuzzi,
A. William Rutherford,
Jasper J. van Thor
Publication year - 2020
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.2006016117
Subject(s) - chlorophyll , light harvesting complexes of green plants , chlorophyll a , photosystem ii , ultrafast laser spectroscopy , photochemistry , chemistry , photosystem i , chlorophyll b , photosynthesis , p700 , spectroscopy , chlorophyll fluorescence , excited state , physics , atomic physics , biochemistry , organic chemistry , quantum mechanics
Significance Far-red photosystem II (FR-PSII) contains a small number of FR-chlorophylls (-f or -d ) with the rest (∼85%) being chlorophyll-a molecules. Here ultrafast studies on FR-PSII support a model in which the primary electron donor is a FR-chlorophyll (P720 , likely in the ChlD1 position), while the second electron donor is chlorophyll-a at the PD1 position, forming PD1 +• . Excitation energy transfer from chlorophyll-a to the FR-chlorophylls is ultrafast. The excited state of FR-chlorophyll remains highly localized, i.e., P720 * does not share the excitation with the chlorophyll-a pigments. This is markedly different from both the conventional, chlorophyll-a PSII, and the chlorophyll-d PSII ofAcaryochloris marina . The entropic and site-energy differences result in efficient but apparently slower stabilization of the charge-separated state.
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