an L-alpha-amino acid + L-arginine + ATP = L-arginyl-L-alpha-amino acid + ADP + phosphate + H(+)
an l-alpha-amino acid + l-arginine + atp = l-arginyl-l-alpha-amino acid + adp + phosphate + h(+)
"L-arginine-specific L-amino acid ligase"
"l-arginine-specific l-amino acid ligase"