protein-glutamic acid ligase activity, initiating
protein-glutamic acid ligase activity, initiating
L-glutamyl-[protein] + L-glutamate + ATP = gamma-L-glutamyl-L-glutamyl-[protein] + ADP + phosphate + H(+)
l-glutamyl-[protein] + l-glutamate + atp = gamma-l-glutamyl-l-glutamyl-[protein] + adp + phosphate + h(+)