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| Main Authors: | , , , , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Nature communications
2026
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/41760652/ |
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Table of Contents:
- Structure and energy transfer of a far-red-absorbing euglenophyte PSI-LhcE-LhcbM supercomplex. Li, Kang Qin, Bing-Yue Zhang, Yu-Zhong Wang, Hao-Jie Wen, Quan Qu, Xin-Xiao Zhao, Fang Chen, Xiu-Lan Gao, Jun Liu, Lu-Ning Zhao, Long-Sheng Light-Harvesting Protein Complexes Energy Transfer Photosystem I Protein Complex Euglena gracilis Photosynthesis Plastids Chlorophyll Euglenophyta originated from a secondary endosymbiosis between a phagotrophic euglenid and a green alga. Euglenophytes acquired photosynthesis-related genes from diverse algal lineages, representing a remarkable example of plastid evolution in the green lineage. Here, we solve the structure of the PSI-LhcE-LhcbM supercomplex from the euglenophyte Euglena gracilis. This supercomplex contains a simplified PSI core and an extensive antenna system, including 13 LhcEs and 2 LhcbMs. The LHCs are arranged as centrosymmetric dimers or monomers, resulting in a specific antenna organization. Notably, the LhcbMs are robustly integrated into the supercomplex through direct interactions with PsaB, PsaJ, and PsaF, without the need for phosphorylation. This phosphorylation-independent assembly mechanism highlights a specific adaptation in euglenophyte PSI-LhcE-LhcbM organization. We also identify specific structural features surrounding red-shifted chlorophyll a pairs in LHCs, which may account for the enhancement of far-red light absorption of PSI-LhcE-LhcbM. Computational simulations further reveal a distinctive pigment network, facilitating efficient energy transfer within the supercomplex. Our study not only provides insights into the mechanisms of light harvesting and energy transfer in euglenophyte PSI-LhcE-LhcbM but also broadens the framework of plastid evolution and complexity, with implications for modulation and bioengineering of photosynthetic complexes.