Evolution and function of light-harvesting antenna in oxygenic photosynthesis

摘要: Abstract The light-harvesting proteins of oxygenic photosynthesis include mainly the phycobiliproteins and complex (Lhc) family. Whereas former are found in cyanobacteria, glaucophytes, red algae cryptophytes, latter present all eukaryotic organisms. Phycobiliproteins covalently bind bilins arranged phycobilisomes most organisms form huge extramembranous protein aggregates. Only cryptophytes they lumenally localized. Lhc membrane intrinsic fall two distinct groups: Lhca Lhcb, serving as photosystem I (PSI) II (PSII) antenna, respectively, green lineage (e.g., from to higher plants well chlorarachniophytes euglenophytes). These non-covalently Chl b, besides a carotenoids (Car). other group consists Lhcf, Lhcr, Lhcy, Lhcz, RedCaps photoprotective Lhcx. They variety often c a, depending on taxon. (red derived thereof by secondary endosymbiosis, like, e.g., diatoms). Lhcx (also called LhcSR) is binds also b instead c. Lhcf Lhcr main lineage, whereby constitutes PSI antenna. Besides these families, another protein, PsbS, expressed that contains no pigments four helices. dinoflagellates contain an additional, water-soluble so-called peridinin-Chl protein.