3.5.4.5	Co2+	-	669137	
3.5.4.5	Mg2+	1 mM, activity 101%	209644	
3.5.4.5	Mg2+	activation	669137	
3.5.4.5	Mn2+	-	209644, 669137	
3.5.4.5	Mn2+	10 mM, activity 106%	209644	
3.5.4.5	Mn2+	slight activation	209649	
3.5.4.5	Zinc	wild-type enzyme and mutant enzymes R56A, R56Q and C53H/R56Q contain about 1 mol of zinc per subunit. Mutant enzyme R56D contains 0.2 mol of zinc per subunit	654757	
3.5.4.5	Zn2+	-	686066	
3.5.4.5	Zn2+	1 M tightly bound zinc per enzyme subunit, activated by added zinc	209664	
3.5.4.5	Zn2+	1 mM, activity 103%	209644