Thermoluminescence measurements on chloride-depleted and calcium-depleted photosystem II
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منابع مشابه
Thermoluminescence evidence for light-induced oxidation of tyrosine and histidine residues in manganese-depleted photosystem II particles.
In the thermoluminescence (TL) glow curve of photosystem II, particles depleted of manganese, a tyrosine modifier, 7-chloro-4-nitrobenz-2-oxa-1,3-diazole (NBD) abolishes the TL band appearing around -55 degrees C (TL-55). Addition of a histidine modifier, diethylpyrocarbonate results in the disappearance of the band peaking around -30 degrees C (TL-30). NBD treatment also abolishes the EPR sign...
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In the recombination process of Photosystem II (S(2)Q(A)(-)-->S(1)Q(A)) the limiting step is the electron transfer from the reduced primary acceptor pheophytin Ph(-) to the oxidized primary donor P(+) and the rate depends on the equilibrium constant between states S(2)PPhQ(A)(-) and S(1)P(+)Ph(-)Q(A). Accordingly, mutations that affect the midpoint potential of Ph or of P result in a modified r...
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Ž . Ž . Four quanta of light, absorbed by Photosystem II PS II , drive the catalytic center of oxygen evolution OEC through w x Ž . Ž . five transitions which are named S ́S to S ́S TMS 1 . Manganese Mn , tyrosine Y and a chemically 0 1 3 4 0 4 Z ill-defined compound, X, serve as redox cofactors. Transient optical absorption spectra of PS II core particles have led us to ) ) y w x propose that ...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 1998
ISSN: 0005-2728
DOI: 10.1016/s0005-2728(98)00009-7