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pubmed-article:19648051pubmed:abstractTextCatalytic quinone cofactors derived from post-translational modification of amino acid residues within the enzyme polypeptide have roles in a variety of biological processes ranging from metabolism in bacteria to inflammation and connective tissue maturation in humans. In recent years, studies of the biosynthesis of one of these cofactors, tryptophan tryptophylquinone (TTQ), have provided examples of novel chemistry that is required for the generation of these protein-derived cofactors. A novel c-type diheme enzyme, MauG, catalyzes a six-electron oxidation that completes TTQ biosynthesis in a 119-kDa protein substrate. The post-translational modification reactions proceed via an unprecedented Fe(V) equivalent catalytic intermediate comprising two hemes; one an Fe(IV)=O and the other a six-coordinate Fe(IV) with axial ligands provided by amino acid residues. This high-valent diheme species is an alternative to Compound I, an Fe(IV)=O heme with a porphyrin or amino acid cation radical, which is typically the reactive intermediate of heme-dependent oxygenases and peroxidases.lld:pubmed
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pubmed-article:19648051pubmed:authorpubmed-author:DavidsonVicto...lld:pubmed
pubmed-article:19648051pubmed:authorpubmed-author:WilmotCarrie...lld:pubmed
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pubmed-article:19648051pubmed:pagination469-74lld:pubmed
pubmed-article:19648051pubmed:dateRevised2010-12-3lld:pubmed
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pubmed-article:19648051pubmed:year2009lld:pubmed
pubmed-article:19648051pubmed:articleTitleUncovering novel biochemistry in the mechanism of tryptophan tryptophylquinone cofactor biosynthesis.lld:pubmed
pubmed-article:19648051pubmed:affiliationDepartment of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 321 Church Street SE, Minneapolis, MN 55455, USA. wilmo004@umn.edulld:pubmed
pubmed-article:19648051pubmed:publicationTypeJournal Articlelld:pubmed
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