23867 hypothetical proteinThalassiosira pseudonana
GO:0008757 GO:0004719 GO:0006464 -
S-adenosylmethionine-dependent methyltransferase activity
Catalysis of the transfer of a methyl group from S-adenosyl-L-methionine to a substrate.
protein-L-isoaspartate (D-aspartate) O-methyltransferase activity
Catalysis of the reaction: S-adenosyl-L-methionine + protein L-beta-aspartate = S-adenosyl-L-homocysteine + protein L-beta-aspartate methyl ester.
cellular protein modification process
The covalent alteration of one or more amino acids occurring in proteins, peptides and nascent polypeptides (co-translational, post-translational modifications) occurring at the level of an individual cell. Includes the modification of charged tRNAs that are destined to occur in a protein (pre-translation modification).