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Many heavy metals inhibit electron transfer reactions in Photosystem II (PSII). Cd 2+ is known to exchange, with high affinity in a slow reaction, for the Ca 2+ cofactor in the Ca/Mn cluster that constitutes the oxygen-evolving center. This results in inhibition of photosynthetic oxygen evolution. There are also indications that Cd 2+ binds to other sites in PSII, potentially...
Ca 2+ depletion of Photosystem II from spinach results in reversible retardation of electron transfer on both donor and acceptor sides. On the donor side, a decrease of the electron transfer rate from TyrZ results in an enhanced charge recombination between the oxidized primary donor, P680 + , and the reduced acceptor quinone, Q -A , which in turn leads to a decrease...
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