1.13.99.1 Fe2+ 1 mM 671152, 676819 1.13.99.1 Fe2+ 1 mM Fe(II) + 4 mM quinolinate activate to 70% of the Fe(II)/cysteine system, Fe(II) alone causes very little activation, quinolinate gives considerable activation in absence of Fe(II), activation by Fe(II) and quinolinate is very temperature dependent 6866 1.13.99.1 Fe2+ 1 mM Fe(II) and 2 mM cysteine 6866, 6874 1.13.99.1 Fe2+ 1 mM Fe2+ plus 2mM cysteine required 172313 1.13.99.1 Fe2+ 2 mM used in assay conditions 764595 1.13.99.1 Fe2+ best activation system 6866 1.13.99.1 Fe2+ contains iron most probably in divalent form, enzyme consisting of 16 subunits contains 8 iron atoms per molecule 6870 1.13.99.1 Fe2+ either reagent alone gives very little activation 6874 1.13.99.1 Fe2+ iron protein 6869, 6870 1.13.99.1 Fe2+ less active preparations: 1.5 atoms of iron per molecule 6869 1.13.99.1 Fe2+ most active preparation: 4 mol of iron per 65000 MW protein 6869 1.13.99.1 Fe2+ no other metal ion can replace Fe(II) 6874 1.13.99.1 Fe2+ nonheme iron enzyme 6875 1.13.99.1 Iron contains a non-heme dinuclear iron cluster, observations implicate the mixed-valent, diiron-(II/III) form of the enzyme as the active state 672164 1.13.99.1 Iron diiron cluster 687712 1.13.99.1 Iron dinuclear iron cluster 672163 1.13.99.1 Iron enzyme contains non-heme iron 660234 1.13.99.1 Iron the mixed-valent, II/III state of iron, rather than the conventional II/II state, activates O2 for D-glucuronate production in the MIOX reaction 676860 1.13.99.1 Iron uses its dinuclear iron cluster to activate O2 for cleavage of myo-inositol that binds to the mixed-valence diiron center via a bridging alkoxide 674174