1.1.3.15	Ag+	up to 4fold induction	
1.1.3.15	Cd2+	induction	
1.1.3.15	Cu2+	exposure of cells to mM copper sulfate, strong induction. Highest induction at 0.3 mM, about 16-fold increase in activity. Identification of a copper-response element in the 5'-region of the LctO gene	
1.1.3.15	CuSO4	induces copper regulated promoter, upregulates LctO 17fold (2D gel)	
1.1.3.15	additional information	Zn2+, Fe2+, Ni2+, Mn2+, and Ca2+ have no significant effect on lctO expression