The two binding sites for DCMU in Photosystem II |
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| Authors: | B D Hsu J Y Lee R L Pan |
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| Institution: | 1. Laboratory of Tropical Crop Improvement, Division of Crop Biotechnics, KU Leuven, Leuven, Belgium;2. Facility for Systems Biology based Mass Spectrometry (SYBIOMA), KU Leuven, Leuven, Belgium;3. Bioversity International, Leuven, Belgium;4. International Institute of Tropical Agriculture, Arusha, Tanzania;1. Department of Chemistry, P. O. Box 84428, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia;2. Department of Chemistry, College of Sciences, Taibah University, Al-Medina Al-Munawara 41477, Saudi Arabia;3. Department of Chemistry, Jamia Millia Islamia, (Central University), New Delhi 11025, India;4. Department of Chemistry, P. O. Box 2455, College of Science, King Saud University, Riyadh - 11451, Saudi Arabia;1. Aix Marseille Université — AMU, Laboratoire de Génétique et Biophysique des Plantes, 13009 Marseille, France;2. Commissariat à l''Energie Atomique — CEA, Direction des Sciences du Vivant, Institut de Biologie Environnementale et Biotechnologie, 13009 Marseille, France;3. Centre National de la Recherche Scientifique — CNRS, Unité Mixte de Recherche 7265, Biologie Végétale et Microbiologie Environnementales, 13009 Marseille, France |
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| Abstract: | Measurements on the fluorescence induction of Triton X-100 extracted Photosystem II (PSII) particles confirmed the existence of the two sites of inhibition in PSII for the herbicide DCMU. The two sites were located on the reducing and oxidizing sides of PSII, respectively. The inhibition on the oxidizing side, unlike that on the reducing side which was of the "none or all" type, was found only to slow down the electron donation at low concentrations of DCMU. The results also suggested that the inhibitions of DCMU at these two sites were mutually exclusive, i.e., the binding on one site prevented the binding on the other site. |
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