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

ABSTRACT: Quinone analogue molecules, functioning as herbicides, bind to the secondary quinone site, Q_B, 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 (Q_A) in these crystal structures. However, a slight E_m difference at the bacteriopheophytin in the electron transfer inactive branch (H_M)

SUBMITTER: Nishikawa G 

PROVIDER: S-EPMC11080998 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature