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Pyrenoids: CO2-fixing phase separated liquid organelles.

James Barrett1, Philipp Girr1, Luke C M Mackinder1

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Pyrenoids, crucial for photosynthesis, form via liquid-liquid phase separation (LLPS) of Rubisco. Understanding pyrenoid assembly across diverse species can enhance crop yields.

Keywords:
AlgaeCCMsCO(2)-concentrating mechanismsLiquid-liquid phase separationMembraneless organellesPyrenoid

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Photosynthesis Research

Background:

  • Pyrenoids are non-membrane bound organelles in algae and hornworts.
  • They are essential for carbon concentrating mechanisms, mediating ~30% of global carbon fixation.
  • Pyrenoid formation is linked to liquid-liquid phase separation (LLPS) of Rubisco and Rubisco-binding proteins.

Purpose of the Study:

  • To review current knowledge on pyrenoid assembly, regulation, and structure in Chlamydomonas reinhardtii.
  • To highlight evidence supporting LLPS as a general mechanism for pyrenoid formation across diverse lineages.
  • To emphasize the importance of understanding pyrenoid biogenesis for future crop engineering.

Main Methods:

  • Literature review and synthesis of existing research on pyrenoids.
  • Focus on molecular mechanisms of pyrenoid formation in Chlamydomonas reinhardtii.
  • Comparative analysis of pyrenoid assembly principles across different algal and hornwort species.

Main Results:

  • Pyrenoids are formed through liquid-liquid phase separation (LLPS) of Rubisco and intrinsically disordered proteins.
  • LLPS is proposed as the unifying principle behind the convergent evolution of pyrenoids.
  • Current molecular understanding is primarily derived from the model alga Chlamydomonas reinhardtii.

Conclusions:

  • Liquid-liquid phase separation is the fundamental mechanism driving pyrenoid formation.
  • Further research into diverse lineages is crucial for a comprehensive understanding of pyrenoid biogenesis.
  • Engineering pyrenoids into crops holds potential for significantly improving photosynthetic efficiency and crop yields.