4.4.1.3 Ca2+ - 747144 4.4.1.3 Cobalt DddW has the highest affinity for binding Fe(II) at 5 nM, followed by Co(II), Ni(II), and Cu(II) at about 1-3 microM 749057 4.4.1.3 copper DddW has the highest affinity for binding Fe(II) at 5 nM, followed by Co(II), Ni(II), and Cu(II) at about 1-3 microM 749057 4.4.1.3 Iron isolated protein contains 0.5 Fe per subunit. The UV-visible spectrum exhibits a feature at 550 nm, consistent with a tyrosinate-Fe(III) ligand-to-metal charge transfer transition. Both the Fe(III) oxidized and Fe(II) reduced species are active 747110 4.4.1.3 Iron the as-isolated enzyme contains 0.2-0.4 equivalents of bound iron. DddW has the highest affinity for binding Fe(II) at 5 nM, followed by Co(II), Ni(II), and Cu(II) at about 1-3 microM, with Mn(II) and Fe(III) exhibiting weaker binding affinities. The presence of Fe(II) or Mn(II) elicits an about 40fold increase in DddW lyase activity compared to the apo-enzyme 749057 4.4.1.3 Manganese the presence of Fe(II) or Mn(II) elicits an about 40fold increase in DddW lyase activity compared to the apo-enzyme 749057 4.4.1.3 Mn2+ - 747144 4.4.1.3 additional information none of the metals Co, Cu, Mn, Ni or Zn is detected at above background levels 716137 4.4.1.3 Nickel DddW has the highest affinity for binding Fe(II) at 5 nM, followed by Co(II), Ni(II), and Cu(II) at about 1-3 microM 749057 4.4.1.3 Zinc Zn2+ is bound at the active site 748399