Energy Transfer and Radical-Pair Dynamics in Photosystem I with Different Red Chlorophyll a Pigments.

ABSTRACT: We establish a general kinetic scheme for the energy transfer and radical-pair dynamics in photosystem I (PSI) of Chlamydomonas reinhardtii, Synechocystis PCC6803, Thermosynechococcus elongatus and Spirulina platensis grown under white-light conditions. With the help of simultaneous target analysis of transient-absorption data sets measured with two selective excitations, we resolved the spectral and kinetic properties of the different species present in PSI. WL-PSI can be described as a Bulk Chl a in equilibrium with a higher-energy Chl a, one or two Red Chl a and a reaction-center compartment (WL-RC). Three radical pairs (RPs) have been resolved with very similar properties in the four model organisms. The charge separation is virtually ir

SUBMITTER: van Stokkum IHM 

PROVIDER: S-EPMC11012434 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature