Redox potentials of ubiquinone, menaquinone, phylloquinone, and plastoquinone in aqueous solution
| Autor: | Keisuke Saito, Yuki Kato, Hiroshi Ishikita, Shinnosuke Kishi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Photosynthetic reaction centre Cytochrome Photosystem II Plastoquinone Ubiquinone Inorganic chemistry Rhodobacter sphaeroides Plant Science Photosystem I Biochemistry Redox Medicinal chemistry Bacterial photosynthetic reaction centers 03 medical and health sciences chemistry.chemical_compound Blastochloris viridis Alphaproteobacteria Molecular Structure 030102 biochemistry & molecular biology biology Chemistry Cytochrome bc1 Cytochrome b6f Photosystem II Protein Complex Vitamin K 2 Vitamin K 1 Cell Biology General Medicine Solutions 030104 developmental biology Saturated calomel electrode biology.protein Dimethylformamide Original Article Oxidation-Reduction |
| Zdroj: | Photosynthesis Research |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-017-0433-4 |
| Popis: | Quinones serve as redox active cofactors in bacterial photosynthetic reaction centers: photosystem I, photosystem II, cytochrome bc 1, and cytochrome b 6 f. In particular, ubiquinone is ubiquitous in animals and most bacteria and plays a key role in several cellular processes, e.g., mitochondrial electron transport. Their experimentally measured redox potential values for one-electron reduction E m(Q/Q·−) were already reported in dimethylformamide (DMF) versus saturated calomel electrode but not in water versus normal hydrogen electrode (NHE). We calculated E m(Q/Q·−) of 1,4-quinones using a quantum chemical approach. The calculated energy differences of reduction of Q to Q·− in DMF and water for 1,4-quinone derivatives correlated highly with the experimentally measured E m(Q/Q·−) in DMF and water, respectively. E m(Q/Q·−) were calculated to be −163 mV for ubiquinone, −260 mV for menaquinone and phylloquinone, and −154 mV for plastoquinone in water versus NHE. |
| Databáze: | OpenAIRE |
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