Photoprotection through ultrafast charge recombination in photochemical reaction centres under oxidizing conditions.

ABSTRACT: Engineering natural photosynthesis to address predicted shortfalls in food and energy supply requires a detailed understanding of its molecular basis and the intrinsic photoprotective mechanisms that operate under fluctuating environmental conditions. Long-lived triplet or singlet excited electronic states have the potential to cause photodamage, particularly in the presence of oxygen, and so a variety of mechanisms exist to prevent formation of such states or safely dissipate their energy. Here, we report a dramatic difference in spectral evolution in fully reduced and partially oxidized Rhodobacter sphaeroides reaction centres (RCs) following excitation of the monomeric bacteriochlorophyll (BChl) cofactors at 805 nm. Three types of preparation were studied, including RCs purified as prot

SUBMITTER: Ma F 

PROVIDER: S-EPMC5566878 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature