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Mermet S, Voisin M, Mordier J, Dubos T, Tutois S, Tuffery P, Baroux C, Tamura K, Probst AV, Vanrobays E, Tatout C. Evolutionarily conserved protein motifs drive interactions between the plant nucleoskeleton and nuclear pores. Plant Cell 2023; 35:4284-4303. [PMID: 37738557 PMCID: PMC10689174 DOI: 10.1093/plcell/koad236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 07/07/2023] [Accepted: 08/14/2023] [Indexed: 09/24/2023]
Abstract
The nucleoskeleton forms a filamentous meshwork under the nuclear envelope and contributes to the regulation of nuclear shape and gene expression. To understand how the Arabidopsis (Arabidopsis thaliana) nucleoskeleton physically connects to the nuclear periphery in plants, we investigated the Arabidopsis nucleoskeleton protein KAKU4 and sought for functional regions responsible for its localization at the nuclear periphery. We identified 3 conserved peptide motifs within the N-terminal region of KAKU4, which are required for intermolecular interactions of KAKU4 with itself, interaction with the nucleoskeleton protein CROWDED NUCLEI (CRWN), localization at the nuclear periphery, and nuclear elongation in differentiated tissues. Unexpectedly, we find these motifs to be present also in NUP82 and NUP136, 2 plant-specific nucleoporins from the nuclear pore basket. We further show that NUP82, NUP136, and KAKU4 have a common evolutionary history predating nonvascular land plants with KAKU4 mainly localizing outside the nuclear pore suggesting its divergence from an ancient nucleoporin into a new nucleoskeleton component. Finally, we demonstrate that both NUP82 and NUP136, through their shared N-terminal motifs, interact with CRWN and KAKU4 proteins revealing the existence of a physical continuum between the nuclear pore and the nucleoskeleton in plants.
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Affiliation(s)
- Sarah Mermet
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Maxime Voisin
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Joris Mordier
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Tristan Dubos
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Sylvie Tutois
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Pierre Tuffery
- Université Paris Cité, CNRS UMR 8251, INSERM ERL U1133, 75013 Paris, France
| | - Célia Baroux
- Department of Plant and Microbial Biology, Zürich-Basel Plant Science Center, University of Zürich, 8008 Zürich, Switzerland
| | - Kentaro Tamura
- Department of Environmental and Life Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Aline V Probst
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Emmanuel Vanrobays
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
| | - Christophe Tatout
- iGReD, Université Clermont Auvergne, CNRS, INSERM, 63001 Clermont-Ferrand, France
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