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-Structure paper
| タイトル | A distinct LHCI arrangement is recruited to photosystem I in Fe-starved green algae. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 25, Page e2500621122, Year 2025 |
| 掲載日 | 2025年6月24日 |
著者 | Helen W Liu / Radhika Khera / Patricia Grob / Sean D Gallaher / Samuel O Purvine / Carrie D Nicora / Mary S Lipton / Krishna K Niyogi / Eva Nogales / Masakazu Iwai / Sabeeha S Merchant / ![]() |
| PubMed 要旨 | Iron (Fe) availability limits photosynthesis at a global scale where Fe-rich photosystem (PS) I abundance is drastically reduced in Fe-poor environments. We used single-particle cryoelectron ...Iron (Fe) availability limits photosynthesis at a global scale where Fe-rich photosystem (PS) I abundance is drastically reduced in Fe-poor environments. We used single-particle cryoelectron microscopy to reveal a unique Fe starvation-dependent arrangement of light-harvesting chlorophyll (LHC) proteins where Fe starvation-induced TIDI1 is found in an additional tetramer of LHC proteins associated with PSI in and . These cosmopolitan green algae are resilient to poor Fe nutrition. TIDI1 is a distinct LHC protein that co-occurs in diverse algae with flavodoxin (an Fe-independent replacement for the Fe-containing ferredoxin). The antenna expansion in eukaryotic algae we describe here is reminiscent of the iron-starvation induced (encoding) antenna ring in cyanobacteria, which typically co-occurs with , encoding flavodoxin. Our work showcases the convergent strategies that evolved after the Great Oxidation Event to maintain PSI capacity. |
リンク | Proc Natl Acad Sci U S A / PubMed:40523173 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.1 - 3.0 Å |
| 構造データ | EMDB-48262, PDB-9mgw: EMDB-48264, PDB-9mgz: EMDB-48265, PDB-9mh0: EMDB-48266, PDB-9mh1: |
| 化合物 | ![]() ChemComp-CLA: ![]() ChemComp-CHL: ![]() ChemComp-LUT: ![]() ChemComp-XAT: ![]() ChemComp-BCR: ![]() ChemComp-LMG: ![]() ChemComp-LMU: ![]() ChemComp-LHG: ![]() ChemComp-PTY: ![]() ChemComp-SQD: ![]() ChemComp-3PH: ![]() ChemComp-DGD: ![]() ChemComp-LMK: ![]() ChemComp-CL0: ![]() ChemComp-PQN: ![]() ChemComp-SF4: ![]() ChemComp-4RF: ![]() ChemComp-HOH: ![]() ChemComp-OCD: |
| 由来 |
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キーワード | PHOTOSYNTHESIS / iron homeostasis / membrane protein / photosystem I / Dunaliella / green alga / PSI-LHCI supercomplex / TIDI / thylakoid iron-deficiency induced protein / photosynthetic apparatus / eukaryotes / iron homeostasis; membrane protein; photosystem I; Dunaliella; green alga; PSI-LHCI supercomplex; TIDI; thylakoid iron-deficiency induced protein; photosynthetic apparatus; photosynthesis; eukaryotes / PHOTOSYNTHESIS; Dunaliella tertiolecta |
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dunaliella salina (しおひげむし)
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