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Pathway Description
Oxidative Phosphorylation
Escherichia coli
Metabolic Pathway
The process of oxidative phosphorylation involves multiple interactions of ubiquinone with succinic acid, resulting in a fumaric acid and ubiquinol.
Ubiquinone interacts with succinic acid through a succinate:quinone oxidoreductase resulting in a fumaric acid an ubiquinol. This enzyme has various cofactors, ferroheme b, 2FE-2S, FAD, and 3Fe-4S iron-sulfur cluster.
Then 2 ubiquinol interact with oxygen and 4 hydrogen ion through a cytochrome bd-I terminal oxidase resulting in a 4 hydrogen ion transferred into the periplasmic space, 2 water returned into the cytoplasm and 2 ubiquinone, which stay in the inner membrane.
The ubiquinone interacts with succinic acid through a succinate:quinone oxidoreductase resulting in a fumaric acid an ubiquinol.
Then 2 ubiquinol interacts with oxygen and 4 hydrogen ion through a cytochrome bd-II terminal oxidase resulting in a 4 hydrogen ion transferred into the periplasmic space, 2 water returned into the cytoplasm and 2 ubiquinone, which stay in the inner membrane.
The ubiquinone interacts with succinic acid through a succinate:quinone oxidoreductase resulting in a fumaric acid an ubiquinol.
The 2 ubiquinol interact with oxygen and 8 hydrogen ion through a cytochrome bo terminal oxidase resulting in a 8 hydrogen ion transferred into the periplasmic space, 2 water returned into the cytoplasm and 2 ubiquinone, which stays in the inner membrane.
The ubiquinone then interacts with 5 hydrogen ion through a NADH dependent ubiquinone oxidoreductase I resulting in NAD, hydrogen ion released into the periplasmic space and an ubiquinol.
The ubiquinol is then processed reacting with oxygen, and 4 hydrogen through a ion cytochrome bd-I terminal oxidase resulting in 4 hydrogen ions released into the periplasmic space, 2 water molecules into the cytoplasm and 2 ubiquinones.
The ubiquinone then interacts with 5 hydrogen ion through a NADH dependent ubiquinone oxidoreductase I resulting in NAD, hydrogen ion released into the periplasmic space and an ubiquinol.
The 2 ubiquinol interact with oxygen and 8 hydrogen ion through a cytochrome bo terminal oxidase resulting in a 8 hydrogen ion transferred into the periplasmic space, 2 water returned into the cytoplasm and 2 ubiquinone, which stays in the inner membrane.
References
Oxidative Phosphorylation References
Matsushita K, Ohnishi T, Kaback HR: NADH-ubiquinone oxidoreductases of the Escherichia coli aerobic respiratory chain. Biochemistry. 1987 Dec 1;26(24):7732-7.
Pubmed: 3122832
Bogachev AV, Murtazina RA, Skulachev VP: H+/e- stoichiometry for NADH dehydrogenase I and dimethyl sulfoxide reductase in anaerobically grown Escherichia coli cells. J Bacteriol. 1996 Nov;178(21):6233-7.
Pubmed: 8892824
Puustinen A, Finel M, Haltia T, Gennis RB, Wikstrom M: Properties of the two terminal oxidases of Escherichia coli. Biochemistry. 1991 Apr 23;30(16):3936-42.
Pubmed: 1850294
Wikstrom M, Hummer G: Stoichiometry of proton translocation by respiratory complex I and its mechanistic implications. Proc Natl Acad Sci U S A. 2012 Mar 20;109(12):4431-6. doi: 10.1073/pnas.1120949109. Epub 2012 Mar 5.
Pubmed: 22392981
Kita K, Konishi K, Anraku Y: Terminal oxidases of Escherichia coli aerobic respiratory chain. I. Purification and properties of cytochrome b562-o complex from cells in the early exponential phase of aerobic growth. J Biol Chem. 1984 Mar 10;259(5):3368-74.
Pubmed: 6365921
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