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• W1490451796 abstract "Protein carboxyl methyltransferases, which catalyze transfer of methyl groups from S-adenosyl-L-methionine to the free carboxyl groups of acidic amino acids in proteins, can be divided into two classes based on several characteristics, such as the stoichiometry of substrate protein methylation, base stability of the incorporated methyl group, specificity for substrate, and participation in a regulatory system with which methylesterases are associated. The presence of such an enzyme in a photosynthetic system was demonstrated in the present work. The extent of methylation of chloroplast proteins was stimulated 30% by light and then decreased by the same amount in the presence of the electron transport inhibitor 3-(3',4'-dichlorophenyl)-1', 1'-dimethylurea or uncouplers of phosphorylation, indicating a dependence of the methyltransferase activity on photosynthetic electron transport and the trans-membrane delta pH. The light-independent, as well as the light-dependent, activity is probably of chloroplast origin since the extent of light stimulation in the purified thylakoid membranes and the stromal fraction was similar, and at low concentrations of S-adenosyl-L-methionine the small subunit of ribulose-1,5-bisphosphate carboxylase:oxygenase was found to be the predominant substrate. The labeling pattern of chloroplast proteins and labeling of an exogenous nonchloroplast protein indicated that the methyltransferase activity was not substrate-specific, although at low concentrations of the methyl donor, the small subunit of ribulose-1,5-bisphosphate carboxylase:oxygenase was labeled almost exclusively. Based on the low stoichiometry (less than 100 pmol/mg protein) of the methylation, its base lability, irreversibility, and the lack of substrate specificity except at very low concentrations of methyl donor, it was inferred that the chloroplast methyltransferase is best classified as a class II system that may function as part of a repair mechanism to replace racemized amino acids." @default.
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• W1490451796 date "1987-07-01" @default.
• W1490451796 modified "2023-09-29" @default.
• W1490451796 title "Light-regulated methylation of chloroplast proteins." @default.
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• W1490451796 doi "https://doi.org/10.1016/s0021-9258(18)48004-0" @default.
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