SepN is a septal junction component required for gated cell–cell communication in the filamentous cyanobacterium Nostoc

Ann-Katrin Kieninger, Piotr Tokarz, Ana Janović, Martin Pilhofer, Gregor L. Weiss () and Iris Maldener ()
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Ann-Katrin Kieninger: University of Tübingen
Piotr Tokarz: Eidgenössische Technische Hochschule Zürich
Ana Janović: University of Tübingen
Martin Pilhofer: Eidgenössische Technische Hochschule Zürich
Gregor L. Weiss: Eidgenössische Technische Hochschule Zürich
Iris Maldener: University of Tübingen

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Multicellular organisms require controlled intercellular communication for their survival. Strains of the filamentous cyanobacterium Nostoc regulate cell–cell communication between sister cells via a conformational change in septal junctions. These multi-protein cell junctions consist of a septum spanning tube with a membrane-embedded plug at both ends, and a cap covering the plug on the cytoplasmic side. The identities of septal junction components are unknown, with exception of the protein FraD. Here, we identify and characterize a FraD-interacting protein, SepN, as the second component of septal junctions in Nostoc. We use cryo-electron tomography of cryo-focused ion beam-thinned cyanobacterial filaments to show that septal junctions in a sepN mutant lack a plug module and display an aberrant cap. The sepN mutant exhibits highly reduced cell–cell communication rates, as shown by fluorescence recovery after photobleaching experiments. Furthermore, the mutant is unable to gate molecule exchange through septal junctions and displays reduced filament survival after stress. Our data demonstrate the importance of controlling molecular diffusion between cells to ensure the survival of a multicellular organism.

Date: 2022
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DOI: 10.1038/s41467-022-34946-7

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