spermidine + L-glutamate + ATP <=> gamma-L-glutamylspermidine + ADP + phosphate + H(+)
spermidine + l-glutamate + atp <=> gamma-l-glutamylspermidine + adp + phosphate + h(+)
spermidine + L-glutamate + ATP <=> gamma-L-glutamylspermidine + ADP + phosphate + H(+)
spermidine + l-glutamate + atp <=> gamma-l-glutamylspermidine + adp + phosphate + h(+)