Photosystem I in the Nitrogen-Fixing Cyanobacterium, Anabaena Variabilis ATCC 29413: Subunit Composition and Directed Mutagenesis of Cofactor Binding Proteins
Photosystem I (PSI) and photosystem II (PSII) are two pigment-protein complexes in the thylakoid membranes of chloroplasts of green plants, eukaryotic algae, and cyanobacteria. Each of these two complexes has more than ten polypeptide subunits and a large number of cofactors, e.g., chlorophyll, quinone, heme, iron-sulfur centers, etc. PSII mediates electron transfer from water to plastoquinone whereas PSI catalyzes transfer of electrons from plastocyanin or cytochrome c553 to ferredoxin. Reduced ferredoxin in its turn donates electrons to NADP+, a reaction catalyzed by ferredoxin-NADP oxidoreductase (FNR).
KeywordsFilamentous Cyanobacterium Anabaena Variabilis HB101 Cell PsaI Protein Photoheterotrophic Condition
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