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| Content Provider | PubMed Central |
|---|---|
| Author | Rutherford, A. William Heathcote, Peter Evans, Michael C. W. |
| Abstract | Oxidation–reduction potentiometry was carried out on Rhodopseudomonas viridis chromatophores. Measurements of e.p.r. signals of the semiquinone–iron type at g=1.82 have revealed a more complex situation than previously reported. The presence of three different components is indicated. The midpoint potential (E m) of the primary acceptor quinone/semiquinone couple was found to be approx. −165mV at pH10, with a pK being reached at around pH7.5. The primary acceptor also accepts a second electron with an E m of −525mV, but this redox transition exhibits a hysteresis effect. Interaction effects indicate the presence of another component with E m values at pH10 of approx. −165mV (pK reached at around pH7.5) for single reduction and −350mV (pK at pH10 or greater) for double reduction. It is suggested that this component is the secondary acceptor. Another semiquinone–iron-type component which gives a g=1.82 signal is also present. This component is distinguishable from the primary acceptor by its e.p.r. spectrum, which shows a double peak at g=1.82 and a gx line at g=1.76. This component has E m values at pH10 for single and double reduction of −15mV and approx. −150mV respectively. Both of these E m values are pH-dependent. The presence of an interaction between this component and the photoreduced primary acceptor indicates the close proximity of these components. However, the midpoint potential of this component indicates a function as a secondary electron-transport component rather than an electron acceptor in the reaction centre. The dependence of the bacteriopheophytin intermediate (I) doublet e.p.r. signal on the presence of the semiquinone–iron form of the primary acceptor is demonstrated. The midpoint potential of the I/I− couple is estimated to be lower than −600mV. |
| Starting Page | 515 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | 2 |
| Volume Number | 182 |
| Language | English |
| Publisher Date | 1979-08-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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