Energetics of the Electron Transfer Pathways in the Homodimeric Photosynthetic Reaction Center.

ABSTRACT: Photosynthetic reaction centers from a green sulfur bacterium (GsbRC), the PscA/PscA proteins, and photosystem I (PSI), PsaA/PsaB proteins, share structural similarities. Here, we report the redox potential (E_m) values of GsbRC by solving the linear Poisson-Boltzmann equation and considering the protonation states of all titratable sites in the entire GsbRC protein and identify the factors that shift the E_m values with respect to PSI. The E_m values for one-electron reduction of the accessory (A_-1) and adjacent (A₀) chlorophylls in GsbRC are 100-250 mV higher than those in PSI, whereas the E_m values for the Fe₄S₄ cluster (F_X) are at the same level. The PsaA-Trp697/P

SUBMITTER: Kanda T 

PROVIDER: S-EPMC9671125 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature