A protein complex that acts both as N-acetylglutamate synthase (NAGS) catalysing the production of N-Acetylglutamate from glutamate and acetyl-CoA, and as N-acetylglutamate kinase (NAGK) catalysing the reaction ATP + N-acetyl-L-glutamate = ADP + N-acetyl-L-glutamyl 5-phosphate. [ http://www.ncbi.nlm.nih.gov/pubmed/11553611 ]