9KC5
PSI-LHCI of the red alga Galdieria sulphuraria NIES-3638
This is a non-PDB format compatible entry.
Summary for 9KC5
| Entry DOI | 10.2210/pdb9kc5/pdb |
| EMDB information | 62242 |
| Descriptor | Photosystem I P700 chlorophyll a apoprotein A1, Photosystem I reaction center subunit XI, Photosystem I reaction center subunit XII, ... (32 entities in total) |
| Functional Keywords | photosystem i, electron transport, photosynthesis |
| Biological source | Galdieria sulphuraria More |
| Total number of polymer chains | 20 |
| Total formula weight | 643559.03 |
| Authors | Kato, K.,Nakajima, Y.,Shen, J.R.,Nagao, R. (deposition date: 2024-11-01, release date: 2025-04-23, Last modification date: 2025-05-28) |
| Primary citation | Kato, K.,Kumazawa, M.,Nakajima, Y.,Suzuki, T.,Dohmae, N.,Shen, J.R.,Ifuku, K.,Nagao, R. Structure of a photosystem I supercomplex from Galdieria sulphuraria close to an ancestral red alga. Sci Adv, 11:eadv7488-eadv7488, 2025 Cited by PubMed Abstract: Red algae exhibit unique photosynthetic adaptations, characterized by photosystem I (PSI) supercomplexes containing light-harvesting complexes (LHCs), forming PSI-LHCI supercomplexes. In this study, we solved the PSI-LHCI structure of NIES-3638 at 2.19-angstrom resolution using cryo-electron microscopy, revealing a PSI monomer core associated with seven LHCI subunits. Structural analysis uncovered the absence of phylloquinones, the common secondary electron acceptor in PSI of photosynthetic organisms, suggesting adaptation to a benzoquinone-like molecule. Phylogenetic analysis suggests that retains traits characteristic of an ancestral red alga, including distinctive LHCI binding and interaction patterns. Variations in LHCI composition and interactions across red algae, particularly in red-lineage chlorophyll /-binding-like protein and red algal LHCs, highlight evolutionary divergence and specialization. These findings not only deepen our understanding of red algal PSI-LHCI diversification but also enable us to predict features of an ancestral red algal PSI-LHCI supercomplex, providing a framework to explore evolutionary adaptations from an ancestral red alga. PubMed: 40378202DOI: 10.1126/sciadv.adv7488 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.19 Å) |
Structure validation
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