| | 1 | Author
| Susana Shochata, Noam Adira, Alma Gala, Yorinao Inoueb, Laurence Metsc, Itzhak Ohada | Requires cookie* | | | Title
| Photoinactivation of Photosystem II and Degradation of the D 1 Protein are Reduced in a Cytochrome b j f -Less Mutant of Chlamydomonas reinhardtii  | | | | Abstract
| The effect of unoccupancy of the Q B site by plastoquinone on the photoinactivation of reac tion center II in a Cyt b jf-less mutant of Chlamydomonas reinhardtii, Bb, was investigated. In these cells the oxidation of plastoquinol generated by electron flow via RC II to plastoquinone and thus the turnover of PQH2/PQ via the Q B site are drastically reduced. Reaction center II of the mutant cells was resistant to photoinactivation relative to the control cells as demonstrated by measurements of light-induced destabilization of S2-QB charge recombination, rise in in trinsic fluorescence and loss of variable fluorescence. These parameters relate to functions in volving the reaction center II D 1 protein. The light-induced degradation of D 1 in the mutant cells was also considerably reduced, with a ;l/ 2 value of 7 h as compared, under similar condi tions, to about 1.5 h for the control cells. These results indicate that the photoinactivation of RC II and turnover of the D 1 protein are related and require occupancy of the Q B site by PQ and its light-driven reduction. | | | |
Reference
| Z. Naturforsch. 45c, 395—401 (1990); received November 24 1989 | | | |
Published
| 1990 | | | |
Keywords
| Cytochrome b j f, Chlamydomonas, D 1 Turnover, Q B, Thermoluminescence, Photoinhibition | | | |
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| default:Reihe_C/45/ZNC-1990-45c-0395.pdf | | | | Identifier
| ZNC-1990-45c-0395 | | | | Volume
| 45 | |
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