Redox Potentials of Iron-Sulfur Clusters in Type I Photosynthetic Reaction Centers.

ABSTRACT: The electron transfer pathways in type I photosynthetic reaction centers, such as photosystem I (PSI) and reaction centers from green sulfur bacteria (GsbRC), are terminated by two Fe₄S₄ clusters, F_A and F_B. The protein structures are the basis of understanding how the protein electrostatic environment interacts with the Fe₄S₄ clusters and facilitates electron transfer. Using the protein structures, we calculated the redox potential (E_m) values for F_A and F_B in PSI and GsbRC, solving the linear Poisson-Boltzmann equation. The F_A-to-F_B electron transfer is energetically downhill in the cyanobacterial PSI structure, while it is isoenergetic in the plant PSI structur

SUBMITTER: Kanda T 

PROVIDER: S-EPMC10259448 | biostudies-literature | 2023 Jun

REPOSITORIES: biostudies-literature