2.4.1.101	Ba2+	no activation	488360	
2.4.1.101	Ba2+	slight activation	488368, 488370	
2.4.1.101	Ca2+	-	488370	
2.4.1.101	Ca2+	can substitute Mn2+	488371	
2.4.1.101	Ca2+	slight activation	488360, 488368, 488370	
2.4.1.101	Ca2+	the enzyme in testicular fluid has an absolute requirement for either Co2+, or Mn2+, Mg2+ and ca2+. The activity is stimulated by the cations in the above order. The enzyme from cauda epididymal fluid has an absolute requirement for Mn2+ or Ca2+, with Co2+ and Mg2+ being ineffective	658192	
2.4.1.101	Cd2+	78% efficiency	488360	
2.4.1.101	Cd2+	activation	488360, 488368, 488370	
2.4.1.101	Cd2+	can substitute for Mn2+ with 20%	488368	
2.4.1.101	Co2+	91% efficiency	488360	
2.4.1.101	Co2+	activation	488360, 488368, 488370	
2.4.1.101	Co2+	can substitute for Mn2+ with 80%	488368	
2.4.1.101	Co2+	Co2+, Mn2+ or Mg2+ required, Co2+ is most effective	659000	
2.4.1.101	Co2+	requirement	488379	
2.4.1.101	Co2+	the enzyme in testicular fluid has an absolute requirement for either Co2+, or Mn2+, Mg2+ and ca2+. The activity is stimulated by the cations in the above order. The enzyme from cauda epididymal fluid has an absolute requirement for Mn2+ or Ca2+, with Co2+ and Mg2+ being ineffective	658192	
2.4.1.101	Fe2+	activation	488360, 488368, 488370	
2.4.1.101	Fe2+	can substitute for Mn2+ with 65% efficiency	488368	
2.4.1.101	Fe2+	slight	488360	
2.4.1.101	Mg2+	61% efficiency	488360	
2.4.1.101	Mg2+	activation	488360, 488368, 488370	
2.4.1.101	Mg2+	can substitute for Mn2+ with 40%	488368	
2.4.1.101	Mg2+	Co2+, Mn2+ or Mg2+ required	659000	
2.4.1.101	Mg2+	the enzyme in testicular fluid has an absolute requirement for either Co2+, or Mn2+, Mg2+ and ca2+. The activity is stimulated by the cations in the above order. The enzyme from cauda epididymal fluid has an absolute requirement for Mn2+ or Ca2+, with Co2+ and Mg2+ being ineffective	658192	
2.4.1.101	Mn2+	-	488381	
2.4.1.101	Mn2+	18-26 mM	488362	
2.4.1.101	Mn2+	2 mM	488363	
2.4.1.101	Mn2+	20-80 mM	488372	
2.4.1.101	Mn2+	25-100 mM	488370	
2.4.1.101	Mn2+	binds not independently of UDP-N-acetyl-D-glucose	488376	
2.4.1.101	Mn2+	can also use Ca2+	488371	
2.4.1.101	Mn2+	Co2+, Mn2+ or Mg2+ required, optimal concentration is 50 mM	659000	
2.4.1.101	Mn2+	maximal activity in the presence of 2 mM Mn2+	722834	
2.4.1.101	Mn2+	required	760144	
2.4.1.101	Mn2+	required for activity	721884	
2.4.1.101	Mn2+	requirement	394591, 488360, 488361, 488362, 488363, 488364, 488365, 488366, 488368, 488370, 488371, 488372, 488379	
2.4.1.101	Mn2+	the enzyme in testicular fluid has an absolute requirement for either Co2+, or Mn2+, Mg2+ and ca2+. The activity is stimulated by the cations in the above order. The enzyme from cauda epididymal fluid has an absolute requirement for Mn2+ or Ca2+, with Co2+ and Mg2+ being ineffective	658192	
2.4.1.101	additional information	no activation by Cu2+	488360, 488368, 488370	
2.4.1.101	additional information	no activation by Hg2+	488360	
2.4.1.101	additional information	no activation by Sr2+, Pb2+	488368, 488370	
2.4.1.101	additional information	not stimulated by Mg2+, Co2+, Ca2+, Zn2+ and C2+	722834	
2.4.1.101	Ni2+	34% efficiency	488360	
2.4.1.101	Ni2+	activation	488360, 488368, 488370	
2.4.1.101	Ni2+	can substitute for Mn2+ with 20%	488368	
2.4.1.101	Sn2+	slight activation	488368, 488370	
2.4.1.101	Zn2+	19% efficiency	488360	
2.4.1.101	Zn2+	activation	488360, 488368, 488370	
2.4.1.101	Zn2+	can substitute for Mn2+ with 8%	488368