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<p>Brown algae and other red-algae-derived organisms are major contributors to global CO<sub>2</sub> fixation via photosynthesis. To understand the photosynthetic function of brown algae, we obtained the structure of giant kelp <i>Macrocystis pyrifera</i> photosystem I (PSI) with a fucoxanthin-chlorophyll-protein (FCP) antenna and compared it to known structures from the red-algal lineage. We identified differences in <i>M. pyrifera</i>’s antenna composition, architecture, and chlorophyll networks, as well as a pronounced variation in transmembrane hydrophobic thickness across the PSI-FCP supercomplex, with implications for photochemical function. Our work lays the foundation to understand kelp’s high photosynthetic productivity and reveals drivers of antenna conservation and diversification for the red lineage.</p>

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Structure of giant kelp Photosystem I-FCP uncovers drivers of antenna evolution across the red lineage

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月21日

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  • Jenevieve D. Weissman,
  • Pablo Maturana,
  • Hui M. O. Oung,
  • Reece Riddle,
  • Gabrielle Wyatt,
  • Viktoria G. T. Dubinin,
  • Philipp Zerbe,
  • María Maldonado

摘要

Brown algae and other red-algae-derived organisms are major contributors to global CO2 fixation via photosynthesis. To understand the photosynthetic function of brown algae, we obtained the structure of giant kelp Macrocystis pyrifera photosystem I (PSI) with a fucoxanthin-chlorophyll-protein (FCP) antenna and compared it to known structures from the red-algal lineage. We identified differences in M. pyrifera’s antenna composition, architecture, and chlorophyll networks, as well as a pronounced variation in transmembrane hydrophobic thickness across the PSI-FCP supercomplex, with implications for photochemical function. Our work lays the foundation to understand kelp’s high photosynthetic productivity and reveals drivers of antenna conservation and diversification for the red lineage.