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Herbicide and Plastoquinone Binding to Photosystem II
- Oettmeier, Walter, Soil, Hans-Joachim, Neumann, Eva
- Zeitschrift für Naturforschung 2014 v.39 no.5 pp. 393-396
- Chlamydomonas, benzoquinones, binding capacity, herbicides, photosystem II, spinach, thylakoids
- In plastoquinone-depleted thylakoids “DCMU-type” herbicides generally have a lower binding affinity as compared to control thylakoids, with the exception of DCMU itself. Contrary, binding properties of phenolic herbicides are not affected by plastoquinone depletion. DCMU in plastoquinone-depleted thylakoids can be displaced from the membrane by various substituted 1,4-benzoquinones, including plastoquinone-1. Labeling patterns by azido-atrazine are compared for thylakoids, plastoquinone-depleted thylakoids, and different photosystem II preparations from spinach and Chlamydomonas. Azido-atrazine tags a 32-34 kDa protein, which seems to be different from another 32-34 kDa protein which is preferentially labeled by a plastoquinone-azide.