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Modulation of Electron Transfer Branches by Atrazine and Triazine Herbicides in Photosynthetic Reaction Centers.

Biochemistry 2024 April 9
Quinone analogue molecules, functioning as herbicides, bind to the secondary quinone site, QB , in type-II photosynthetic reaction centers, including those from purple bacteria (PbRC). Here, we investigated the impact of herbicide binding on electron transfer branches, using herbicide-bound PbRC crystal structures and employing the linear Poisson-Boltzmann equation. In contrast to urea and phenolic herbicides [Fufezan, C. Biochemistry 2005, 44, 12780-12789], binding of atrazine and triazine did not cause significant changes in the redox-potential ( E m ) values of the primary quinone (QA ) in these crystal structures. However, a slight E m difference at the bacteriopheophytin in the electron transfer inactive branch (HM ) was observed between the S (-)- and R (+)-triazine-bound PbRC structures. This discrepancy is linked to variations in the protonation pattern of the tightly coupled Glu-L212 and Glu-H177 pairs, crucial components of the proton uptake pathway in native PbRC. These findings suggest the existence of a QB -mediated link between the electron transfer inactive HM and the proton uptake pathway in PbRCs.

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