label: L-glutamyl-[protein] + S-adenosyl-L-methionine <=> [protein]-L-glutamate 5-O-methyl ester + S-adenosyl-L-homocysteine
label_lc: l-glutamyl-[protein] + s-adenosyl-l-methionine <=> [protein]-l-glutamate 5-o-methyl ester + s-adenosyl-l-homocysteine