(glycyl)(n+1)-glycyl-L-glutamyl-[protein] + ADP + phosphate + H(+) => (glycyl)(n)-glycyl-L-glutamyl-[protein] + glycine + ATP
(glycyl)(n+1)-glycyl-l-glutamyl-[protein] + adp + phosphate + h(+) => (glycyl)(n)-glycyl-l-glutamyl-[protein] + glycine + atp