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Major electron transport pathways around P700 in cyanobacteria. A, NDH-1 complex-dependent PS1-mediated cyclic routes, subdivided into F1-type NDH-1-dependent (A1) and F3/F4-type NDH-1-dependent (A2) routes; B, electron flow from metabolites to PQ via respiratory enzymes such as F1-type NDH-1 (B1), F3/F4-type NDH-1 (B2), and SDH (B3); C, electron flow from PQ to oxygen mediated by terminal oxidases. The inhibitory site of KCN and electron leakage due to MV are also indicated.
