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TitleStructure of giant kelp Photosystem I-FCP uncovers drivers of antenna evolution across the red lineage.
Journal, issue, pagesNat Commun, Vol. 17, Issue 1, Year 2026
Publish dateMay 21, 2026
AuthorsJenevieve D Weissman / Pablo Maturana / Hui M O Oung / Reece Riddle / Gabrielle Wyatt / Viktoria G T Dubinin / Philipp Zerbe / María Maldonado /
PubMed AbstractBrown algae and other red-algae-derived organisms are major contributors to global CO fixation via photosynthesis. To understand the photosynthetic function of brown algae, we obtained the structure ...Brown algae and other red-algae-derived organisms are major contributors to global CO 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.
External linksNat Commun / PubMed:42168190 / PubMed Central
MethodsEM (single particle)
Resolution2.47 - 5.21 Å
Structure data

EMDB-72805: Focused refinement of Macrocystis pyrifera PSI-FCP around PSI
Method: EM (single particle) / Resolution: 2.47 Å

EMDB-72806: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP1
Method: EM (single particle) / Resolution: 2.95 Å

EMDB-72807: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP2
Method: EM (single particle) / Resolution: 4.71 Å

EMDB-72808: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP3
Method: EM (single particle) / Resolution: 3.05 Å

EMDB-72809: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP4
Method: EM (single particle) / Resolution: 3.7 Å

EMDB-72810: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP5
Method: EM (single particle) / Resolution: 3.14 Å

EMDB-72811: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP6
Method: EM (single particle) / Resolution: 3.18 Å

EMDB-72812: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP7
Method: EM (single particle) / Resolution: 3.11 Å

EMDB-72813: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP8
Method: EM (single particle) / Resolution: 2.97 Å

EMDB-72814: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP9
Method: EM (single particle) / Resolution: 3.78 Å

EMDB-72816: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP10
Method: EM (single particle) / Resolution: 3.14 Å

EMDB-72817: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP11
Method: EM (single particle) / Resolution: 3.02 Å

EMDB-72818: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP13
Method: EM (single particle) / Resolution: 3.82 Å

EMDB-72819: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP15
Method: EM (single particle) / Resolution: 4.71 Å

EMDB-72820: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP16
Method: EM (single particle) / Resolution: 4.81 Å

EMDB-72821: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP17
Method: EM (single particle) / Resolution: 3.66 Å

EMDB-72822: Focused refinement of Macrocystis pyrifera PSI-FCP around FCP19
Method: EM (single particle) / Resolution: 4.92 Å

EMDB-72824: Focused refinement of Macrocystis pyrifera PSI-FCP around FCPB
Method: EM (single particle) / Resolution: 5.21 Å

EMDB-75351: Focused refinement of Macrocystis pyrifera PSI-FCP around FCPA
Method: EM (single particle) / Resolution: 3.97 Å

EMDB-76146: Composite map of Macrocystis pyrifera PSI-FCP supercomplex
Method: EM (single particle) / Resolution: 2.47 Å

EMDB-76202: Consensus map of Macrocystis pyrifera PSI-FCP supercomplex
Method: EM (single particle) / Resolution: 2.71 Å

Source
  • Macrocystis pyrifera (giant kelp)

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