protein-L-isoaspartate (D-aspartate) O-methyltransferase activity https://github.com/geneontology/go-ontology/issues/30193 protein O-methyltransferase (L-isoaspartate) L-isoaspartyl/D-aspartyl protein carboxyl methyltransferase activity Catalysis of the reaction: S-adenosyl-L-methionine + protein L-beta-aspartate = S-adenosyl-L-homocysteine + protein L-beta-aspartate methyl ester. GO:0004719 protein D-aspartate methyltransferase activity protein (D-aspartate) methyltransferase activity EC:2.1.1.77 protein L-isoaspartate methyltransferase activity protein beta-aspartate O-methyltransferase activity Reactome:R-HSA-5676966 protein-beta-aspartate O-methyltransferase activity protein-L-isoaspartate O-methyltransferase activity molecular_function L-isoaspartyl protein carboxyl methyltransferase activity S-adenosyl-L-methionine:protein-L-isoaspartate O-methyltransferase activity protein L-isoaspartyl methyltransferase activity MetaCyc:2.1.1.77-RXN D-aspartyl/L-isoaspartyl methyltransferase activity L-aspartyl/L-isoaspartyl protein methyltransferase activity protein-L-isoaspartate(D-aspartate) O-methyltransferase activity RHEA:12705 S-adenosylmethionine-dependent methyltransferase activity protein carboxyl O-methyltransferase activity