Binding mode of 1,4-naphthoquinones at the Q_A-site of the reaction centre from Rhodobacter sphaeroides investigated by light-induced FTIR difference spectroscopy

摘要

The reaction centre (RC) from the photosynthetic purple bacterium Rhodobacter sphaeroides (R. sphaeroides) is an integral membrane protein-pigment complex that catalyses the conversion of light energy into chemical energy. The primary steps of light-induced electron transfer include the rapid electron transfer from the primary excited donor D, a bacteriochlorophyll dimer, to the primary electron acceptor Q_A, a ubiquinone-10 (UQ-10) molecule, and further to the secondary ubiquinone Q_B.