التفاصيل البيبلوغرافية
| العنوان: |
The structure of PSI-LHCI from Cyanidium caldarium provides evolutionary insights into conservation and diversity of red-lineage LHCs. |
| المؤلفون: |
Koji Kato, Tasuku Hamaguchi, Minoru Kumazawa, Yoshiki Nakajima, Kentaro Ifuku, Shunsuke Hirooka, Yuu Hirose, Shin-ya Miyagishima, Takehiro Suzuki, Keisuke Kawakami, Naoshi Dohmae, Koji Yonekura, Jian-Ren Shen, Ryo Nagao |
| المصدر: |
Proceedings of the National Academy of Sciences of the United States of America; 3/12/2024, Vol. 121 Issue 11, p1-9, 34p |
| مصطلحات موضوعية: |
PHOTOSYSTEMS, ALGAE |
| مستخلص: |
Light-harvesting complexes (LHCs) are diversified among photosynthetic organisms, and the structure of the photosystem I-LHC (PSI-LHCI) supercomplex has been shown to be variable depending on the species of organisms. However, the structural and evolutionary correlations of red-lineage LHCs are unknown. Here, we determined a 1.92-Å resolution cryoelectron microscopic structure of a PSI-LHCI supercomplex isolated from the red alga Cyanidium caldarium RK-1 (NIES-2137), which is an important taxon in the Cyanidiophyceae. We subsequently investigated the correlations of PSI-LHCIs from different organisms through structural comparisons and phylogenetic analysis. The PSI-LHCI structure obtained shows five LHCI subunits surrounding a PSI-monomer core. The five LHCIs are composed of two Lhcr1s, two Lhcr2s, and one Lhcr3. Phylogenetic analysis of LHCs bound to PSI in the red-lineage algae showed clear orthology of LHCs between C. caldarium and Cyanidioschyzon merolae, whereas no orthologous relationships were found between C. caldarium Lhcr1-3 and LHCs in other red-lineage PSI-LHCI structures. These findings provide evolutionary insights into conservation and diversity of red-lineage LHCs associated with PSI. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
