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- W1985732120 abstract "Two purified isozymes of protein carboxyl methyltransferase from bovine brain catalyze the substoichiometric transfer of methyl groups in vitro from S-adenosyl-L-[methyl-3H]methionine to several erythrocyte membrane proteins, which include bands 2.1, 3, and 4.1, as well as several integral membrane polypeptides. D-Aspartic acid beta-[3H]methyl ester has been isolated from proteolytic digests of these methylated proteins, suggesting that protein D-aspartyl residues can serve as methyl-acceptor sites for the two brain enzymes. This formation of D-aspartic acid beta-[3H]methyl ester is competitively inhibited by the peptide L-Val-L-Tyr-L-Pro-L-isoAsp-Gly-L-Ala, which contains an L-aspartyl residue in an unusual beta-peptide linkage. Since this peptide is a stoichiometric substrate for the brain methyltransferases, it appears that one enzymatic activity can catalyze methyl ester formation at both D-aspartyl and L-isoaspartyl sites. In these respects, the activity of both brain isozymes closely resembles those previously described for the erythrocyte enzyme. The results are discussed in terms of a model in which derivatized aspartyl residues in proteins, arising by either racemization or isomerization, are recognized by the methyltransferase; the enzyme may function in either the metabolism or correction of the altered structures. The presence of a similar enzyme in both translationally active (brain) and inactive (erythrocyte) tissues suggests that the reactions are of general importance to cellular integrity." @default.
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- W1985732120 date "1984-12-01" @default.
- W1985732120 modified "2023-09-23" @default.
- W1985732120 title "Mammalian brain and erythrocyte carboxyl methyltransferases are similar enzymes that recognize both D-aspartyl and L-isoaspartyl residues in structurally altered protein substrates." @default.
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- W1985732120 doi "https://doi.org/10.1073/pnas.81.24.7757" @default.
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