Table 1

Effects of divalent cations on DXP reductoisomerase activity

AdditionSpecific activity, units/mg protein
No0.3
EDTAND
MnC1211.8
CoCl26.0
MgCl24.0
CaCl20.2
NiSO40.2
ZnSO40.3
CuSO4ND
FeSO4ND
  • Enzyme activity was assayed in the standard mixture described under Materials and Methods with 1 mM metal chlorides, metal sulfates, or EDTA. ND, not detected.