title: Superoxide dismutases: ancient enzymes and new insights.
abstract: Superoxide dismutases (SODs) catalyze the de toxification of superoxide. SODs therefore acquired great importance as O(2) became prevalent following the evolution of oxygenic photosynthesis. Thus the three forms of SOD provide intriguing insights into the evolution of the organisms and organelles that carry them today. Although ancient organisms employed Fe-dependent SODs, oxidation of the environment made Fe less bio-available, and more dangerous. Indeed, modern lineages make greater use of homologous Mn-dependent SODs. Our studies on the Fe-substituted MnSOD of Escherichia coli, as well as redox tuning in the FeSOD of E. coli shed light on how evolution accommodated differences between Fe and Mn that would affect SOD performance, in SOD proteins whose activity is specific to one or other metal ion.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA. afm@uky.edu
authors.forename: Anne-Frances
authors.initials: AF
authors.lastname: Miller
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005057:Eukaryotic Cells / Q000201:enzymology; D006801:Humans; D008956:Models, Chemical; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D011387:Prokaryotic Cells / Q000201:enzymology; D013482:Superoxide Dismutase / Q000737:chemistry* / Q000145:classification / Q000378:metabolism; D013481:Superoxides / Q000737:chemistry* / Q000378:metabolism
chemical_list: D013481:Superoxides; D013482:Superoxide Dismutase
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