The influence of diphenylcarbazide and hydrazobenzene on the binding of the herbicide Chlorotoluron (cas 15545-48-9) to isolated thylakoids
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Add time:09/04/2019 Source:sciencedirect.com
To investigate the overlap of the effects of QB site inhibitors and donors of Photosystem II we analyzed the binding of [14C]Chlorotoluron (cas 15545-48-9), a representative of QB site inhibitors, to isolated thylakoids in the presence of two electron donors, sym-diphenylcarbazide or hydrazobenzene. Chlorotoluron binds to pea thylakoids with a Kd of 30 nM and a maximum number of binding sites of 2 nmol/mg Chlorophyll, which corresponds to one ligand molecule per Photosystem II reaction center. Both sym-diphenylcarbazide and hydrazobenzene decreased the affinity of chlorotoluron for the QB site. The decrease in binding could not be explained by a simple competition for the QB niche. Comparison of the dissociation of chlorotoluron to electron transport in normal and Tris-treated thylakoids indicated that this effect of donors on the QB niche is independent of their known capacity to donate electrons to PSII.
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