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Seven synthetic peptide analogs of the phosphorylation site of the light-harvesting chlorophyll a/b complex II (LHC II) were used to examine the substrate specificity of thylakoid-bound LHC II kinase in higher plants. The peptides were phosphorylated by spinach and pea thylakoid membranes in which LHC II kinase had been activated by illumination. Phosphorylation was under redox control, as shown by...
Spinach thylakoids contain at least 8 proteins (8.3-58 kDa) whose phosphorylation is strongly inhibited by the plastoquinone antagonist 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB). Reduction of DBMIB with ascorbate completely or partially relieves inhibition for all proteins other than the 27 kDa light-harvesting complex (LHC) II and a synthetic dodecapeptide (MRKSATTKKAVC). The peptide,...
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