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TitleAn unconventional Rubisco small subunit underpins the CO-concentrating organelle in land plants.
Journal, issue, pagesScience, Vol. 391, Issue 6789, Page 1070-1075, Year 2026
Publish dateMar 5, 2026
AuthorsTanner A Robison / Yuwei Mao / Zhen Guo Oh / Warren S L Ang / Dan Hong Loh / Yu-Heng Hsieh / Maddie Ceminsky / Nicky Atkinson / Declan Lafferty / Xia Xu / Laura H Gunn / Alistair J McCormick / Fay-Wei Li /
PubMed AbstractIn many algae, photosynthesis is boosted by biophysical CO-concentrating mechanisms, which pack the CO-fixing enzyme Rubisco into liquid-like organelles called pyrenoids. Engineering C crops with ...In many algae, photosynthesis is boosted by biophysical CO-concentrating mechanisms, which pack the CO-fixing enzyme Rubisco into liquid-like organelles called pyrenoids. Engineering C crops with algal pyrenoids could increase yields, but progress is hampered by the deep evolutionary divide between crops and algae. Here, we show that hornworts, the only land plants with pyrenoids, have an unusual Rubisco small subunit, RbcS-STAR, the C-terminal coiled-coil domain of which oligomerizes to mediate Rubisco condensation. RbcS-STAR is incorporated into the Rubisco holoenzyme and thus acts as an "innate" Rubisco linker. Expression of RbcS-STAR in pyrenoid-lacking species, including , is sufficient to induce pyrenoid-like condensates. Our findings reveal a mechanism for Rubisco condensation and a potential route to introduce pyrenoids into crop plants.
External linksScience / PubMed:41785357
MethodsEM (single particle)
Resolution3.3 - 6.8 Å
Structure data

EMDB-70517: Anthoceros agrestis Rubisco (8 RbcL and 8 RbcS1) head to head stacking.
Method: EM (single particle) / Resolution: 3.3 Å

EMDB-70520: A. agrestis Rubisco (8 RbcL 7 RbcS 1 RbcS-STAR)
Method: EM (single particle) / Resolution: 6.8 Å

Source
  • Anthoceros agrestis (plant)

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