Nam, Onyou, Musiał, Sabina, Demulder, Manon et al. (7 more authors) (2024) A protein blueprint of the diatom CO2-fixing organelle. Cell. 5935-5950.e18. ISSN 1097-4172
Abstract
Diatoms are central to the global carbon cycle. At the heart of diatom carbon fixation is an overlooked organelle called the pyrenoid, where concentrated CO2 is delivered to densely packed Rubisco. Diatom pyrenoids fix approximately one-fifth of global CO2, but the protein composition of this organelle is largely unknown. Using fluorescence protein tagging and affinity purification-mass spectrometry, we generate a high-confidence spatially defined protein-protein interaction network for the diatom pyrenoid. Within our pyrenoid interaction network are 10 proteins with previously unknown functions. We show that six of these form a shell that encapsulates the Rubisco matrix and is critical for pyrenoid structural integrity, shape, and function. Although not conserved at a sequence or structural level, the diatom pyrenoid shares some architectural similarities to prokaryotic carboxysomes. Collectively, our results support the convergent evolution of pyrenoids across the two main plastid lineages and uncover a major structural and functional component of global CO2 fixation.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2024 The Author(s) |
Keywords: | Diatoms/metabolism,Carbon Dioxide/metabolism,Organelles/metabolism,Ribulose-Bisphosphate Carboxylase/metabolism,Carbon Cycle,Protein Interaction Maps,Photosynthesis |
Dates: |
|
Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Biology (York) The University of York > Faculty of Sciences (York) > Chemistry (York) The University of York > Faculty of Sciences (York) > Biology (York) > Centre for Novel Agricultural Products (CNAP) (York) |
Depositing User: | Pure (York) |
Date Deposited: | 30 Oct 2024 11:10 |
Last Modified: | 02 Apr 2025 23:28 |
Published Version: | https://doi.org/10.1016/j.cell.2024.09.025 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.cell.2024.09.025 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:219049 |
Download
Filename: PIIS0092867424010730.pdf
Description: A protein blueprint of the diatom CO2-fixing organelle
Licence: CC-BY 2.5