S-adenosyl-L-methionine + protein L-isoaspartate = S-adenosyl-L-homocysteine + protein L-isoaspartate α-methyl ester
protein-L-isoaspartate O-methyltransferase; protein-β-aspartate O-methyltransferase; D-aspartyl/L-isoaspartyl methyltransferase; L-isoaspartyl/D-aspartyl protein carboxyl methyltransferase; protein (D-aspartate) methyltransferase; protein D-aspartate methyltransferase; protein L-isoaspartate methyltransferase; protein L-isoaspartyl methyltransferase; protein O-methyltransferase (L-isoaspartate); L-aspartyl/L-isoaspartyl protein methyltransferase
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[EC 220.127.116.11 created 1984, modified 1989 (EC 18.104.22.168 created 1972, modified 1983, modified 1989, part incorporated 1992)]