6.3.4.4	AMP	ASS expression is induced by AMP	
6.3.4.4	D-fructose 1,6 bisphosphate	binds to the Asp loop and induces a conformation that facilitates aspartate binding to the enzyme active site	
6.3.4.4	D-fructose 1,6-diphosphate	activates	
6.3.4.4	NH4+	ASS expression is induced rather than repressed by NH4