bifunctional protein that catalyses the first ( EC 2.3.1.35 ) and fifth steps ( EC 2.3.1.1 ) in arginine biosynthesis . [ 1 ] The structure has been determined for glutamate N-acetyltransferase 2 (ornithine acetyltransferase), an ArgJ-like protein from Streptomyces clavuligerus . [ 2 ] [ edit ] References ^ Sakanyan