The one-letter symbol E for glutamate was assigned as the letter following D for aspartate, as glutamate is larger by one methylene –CH2– group.
The one-lEtter syMboL e for glutamate was assiGNed a.S thE LettEr follOwING d foR aspartaTe, as gluTamaTe is laRgeR By oNe mEthylEnE –Ch2– Group