label: diphthine methyl ester synthase activity
label_lc: diphthine methyl ester synthase activity
description: "Catalysis of the reaction: 2-[(3S)-amino-3-carboxypropyl]-L-histidyl-[translation elongation factor 2] + 4 S-adenosyl-L-methionine = diphthine methyl ester-[translation elongation factor 2] + 3 H+ + 4 S-adenosyl-L-homocysteine."