1r6y
From Proteopedia
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Crystal structure of YgiN from Escherichia coli
Overview
Naturally synthesized quinones perform a variety of important cellular, functions. Escherichia coli produce both ubiquinone and menaquinone, which, are involved in electron transport. However, semiquinone intermediates, produced during the one-electron reduction of these compounds, as well as, through auto-oxidation of the hydroxyquinone product, generate reactive, oxygen species that stress the cell. Here, we present the crystal, structure of YgiN, a protein of hitherto unknown function. The, three-dimensional fold of YgiN is similar to that of ActVA-Orf6, monooxygenase, which acts on hydroxyquinone substrates. YgiN shares a, promoter with "modulator of drug activity B," a protein with activity, similar to that of mammalian DT-diaphorase capable of reducing mendione., YgiN was able to reoxidize menadiol, the product of the "modulator of drug, activity B" (MdaB) enzymatic reaction. We therefore refer to YgiN as, quinol monooxygenase. Modulator of drug activity B is reported to be, involved in the protection of cells from reactive oxygen species formed, during single electron oxidation and reduction reactions. The enzymatic, activities, together with the structural characterization of YgiN, lend, evidence to the possible existence of a novel quinone redox cycle in E., coli.
About this Structure
1R6Y is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Structural and biochemical evidence for an enzymatic quinone redox cycle in Escherichia coli: identification of a novel quinol monooxygenase., Adams MA, Jia Z, J Biol Chem. 2005 Mar 4;280(9):8358-63. Epub 2004 Dec 21. PMID:15613473
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