1.13.11.50 E69Q lower thermal stability of beta-sheet secondary structure, half catalytic center activity and remarkably silent difference in apparent substrate binding compared to the wild type enzyme 675466 1.13.11.50 E98A site-direted mutagenesis 711267 1.13.11.50 E98Q an interplay of residues Glu98, His104, Glu11 (from the neighbor subunit), and Arg80 is the most important for the Fe2+ transport in and out of the protein 742322 1.13.11.50 E98Q site-direted mutagenesis 711267 1.13.11.50 F115A site-directed mutagenesis, the mutant shows reduced turnover and altered iron binding compared to the wild-type enzyme 725553 1.13.11.50 F119A site-directed mutagenesis, the mutant shows reduced turnover and altered iron binding compared to the wild-type enzyme 725553 1.13.11.50 F59A site-directed mutagenesis, the mutant shows reduced turnover and altered iron binding compared to the wild-type enzyme 725553 1.13.11.50 H104E no activity in initial rate assays with substrate pentan-2,4-dione, no binding of Fe2+ at binding site I, small effect on other metal ions 696107 1.13.11.50 H104N approximately 1% of the specific activity of wild-type enzyme with substrate pentan-2,4-dione, retains binding affinity for Fe2+ at binding site I, binding seems to be tighter than in wild-type, small effect on other metal ions 696107 1.13.11.50 H62E no activity in initial rate assays with substrate pentan-2,4-dione, no binding of Fe2+ at binding site I, small effect on other metal ions 696107