Structure, Function, and Variations of the Photosystem I-Antenna Supercomplex from Different Photosynthetic Organisms

Structures, arrangements and functions of LHC antennas for oxygenic photosynthetic organisms

“…除了高等植物 PSI-LHCI 复合物, 近期苔藓植物和不同种绿藻的 PSI-LHCI 复合物结构也 已经被解析 [57,[78][79][80][81] , 其中苔藓植物与高等植物结构相似 [58] , 捕光天线均由 4 个 Lhca 捕光天线 组成. 在高等植物中还发现了 Lhca5 和 Lhca6 天线, 他们也可以结合在 PSI 核心的外围, 分 别替代了 Lhca4 和 Lhca2 的位置以介导环式电子传递复合物形成 [77] (图 4B). 模式绿藻莱茵衣 藻(Chlamydomonas reinhardtii)和一种潮间带绿藻假根羽藻(Bryopsis corulans)的 PSI 都结合 8-10 个 Lhca 天线 [19,[78][79][80][81] (图 4B).…”

Structural basis for molecular assembly of fucoxanthin chlorophylla/c-binding proteins in a diatom photosystem I supercomplex

“…This work clearly showed that the binding sites of LHCIs to PSI were conserved to some extent among red-lineage algae but their evolutionary relationship was poor. It is known that LHCIs have similar protein structures, especially their three-transmembrane helices, among photosynthetic organisms irrespective of the green and red lineages ( 9, 10 ); nevertheless, individual LHCIs have changed their sequences and structures to adapt their binding sites to the PSI cores during assembly of the PSI-LHCI supercomplexes. These observations raise a critical question as to how LHCIs recognize their binding sites in the PSI core.…”

“…The green lineage organisms include green algae and land plants, whereas the red lineage organisms include red algae, diatoms, haptophytes, cryptophytes, and dinoflagellates (8). LHCs that are specific to PSI (LHCIs) interact with a eukaryotic PSI monomer, thereby forming a PSI-LHCI supercomplex (9,10), whose structures have been revealed by cryo-electron microscopy (cryo-EM) in a number of eukaryotes (9,10). In the red lineage, the number of LHCIs and their protein and pigment compositions have been found to differ greatly among the PSI-LHCI structures of red algae (11)(12)(13)(14), a diatom (15,16), a cryptophyte (17), and dinoflagellates (18,19).…”

Structure of PSI-LHCI fromCyanidium caldariumprovides evolutionary insights into conservation and diversity of red-lineage LHCs

“…The green lineage includes green algae and land plants, whereas the red lineage includes red algae, diatoms, haptophytes, cryptophytes, and dinoflagellates 4 . The structures of LHCs and their association patterns with the photosystem cores have been revealed by structural studies, especially using cryo-electron microscopy (cryo-EM) 3,5 . In the red lineage, the number, sequences, and pigment compositions of LHCIs have been found to differ greatly among the PSI-LHCI structures of red algae [6][7][8] , a diatom 9,10 , and a cryptophyte 11 .…”

“…LHCs are highly diversified among photosynthetic organisms in terms of the protein sequences and pigment compositions of chlorophylls (Chls) and carotenoids (Cars) bound to the LHC proteins [1][2][3] . The differences of LHCs cause color variations in photosynthetic organisms, which can be classified into green and red lineages 4 .…”