Redox potentials of ubiquinone, menaquinone, phylloquinone, and plastoquinone in aqueous solution
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چکیده
منابع مشابه
Half-life of ubiquinone and plastoquinone in spinach cells.
The half-life of plastoquinone (PQ), ubiquinone-9 (UQ-9) and ubiquinone-10 (UQ-10) in spinach tissue was determined. This was achieved by monitoring the decay of radioactivity incorporated into these lipids from a labeled precursor. The half-life of PQ was 15 h while for UQ-9 and UQ-10 it was longer, i.e. 30 h. The values of half-lives of PQ and UQ suggest a high rate of turnover of these lipid...
متن کاملMenaquinone-4 in breast milk is derived from dietary phylloquinone.
The effect of maternal phylloquinone supplementation on vitamin K in breast milk was studied to establish: (1) if phylloquinone is the source of menaquinone-4 in breast milk; (2) the dose-effect relationship between intake and obtainable levels. Four groups of lactating mothers with a full-term healthy infant participated and took oral phylloquinone supplements of 0.0 (n 8), 0.8 (n 8), 2.0 (n 8...
متن کاملPlasma phylloquinone, menaquinone-4 and menaquinone-7 levels and coronary artery calcification
Vitamin K is considered to be involved in the pathological mechanisms of coronary artery calcification (CAC). Correlation between CAC and plasma vitamin K levels was studied. A total of 103 patients, with at least one coronary risk factor, were studied. CAC was measured using 64-slice multislice computed tomography (MSCT) and divided into three groups: none (CAC score = 0; n 25), mild to modera...
متن کاملUbiquinone and menaquinone electron carriers represent the yin and yang in the redox regulation of the ArcB sensor kinase.
The Arc two-component system, comprising the ArcB sensor kinase and the ArcA response regulator, modulates the expression of numerous genes in response to respiratory growth conditions. Under aerobic growth conditions, the ubiquinone electron carriers were proposed to silence the kinase activity of ArcB by oxidizing two cytosol-located redox-active cysteine residues that participate in intermol...
متن کاملBiosynthesis of Menaquinone (Vitamin K2) and Ubiquinone (Coenzyme Q).
Escherichia coli and Salmonella contain the naphthoquinones menaquinone (MK; vitamin K2) and demethylmenaquinone and the benzoquinone ubiquinone (coenzyme Q; Q). Both quinones are derived from the shikimate pathway, which has been called a "metabolic tree with many branches." There are two different pathways for the biosynthesis of the naphthoquinones. The vast majority of prokaryotes, includin...
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ژورنال
عنوان ژورنال: Photosynthesis Research
سال: 2017
ISSN: 0166-8595,1573-5079
DOI: 10.1007/s11120-017-0433-4