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Journal Article

Direct induction of microtubule branching by microtubule nucleation factor SSNA1

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Basnet,  Nirakar
Mizuno, Naoko / Cellular and Membrane Trafficking, Max Planck Institute of Biochemistry, Max Planck Society;

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Nedozralova,  Hana
Mizuno, Naoko / Cellular and Membrane Trafficking, Max Planck Institute of Biochemistry, Max Planck Society;

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Schlichthaerle,  Thomas
Jungmann, Ralf / Molecular Imaging and Bionanotechnology, Max Planck Institute of Biochemistry, Max Planck Society;

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Taschner,  Michael
Conti, Elena / Structural Cell Biology, Max Planck Institute of Biochemistry, Max Planck Society;

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Cardone,  Giovanni
Scientific Service Groups, Max Planck Institute of Biochemistry, Max Planck Society;

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Jungmann,  Ralf
Jungmann, Ralf / Molecular Imaging and Bionanotechnology, Max Planck Institute of Biochemistry, Max Planck Society;

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Biertuempfel,  Christian
Biertümpfel, Christian / Molecular Mechanisms of DNA Repair, Max Planck Institute of Biochemistry, Max Planck Society;

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Mizuno,  Naoko
Mizuno, Naoko / Cellular and Membrane Trafficking, Max Planck Institute of Biochemistry, Max Planck Society;

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Citation

Basnet, N., Nedozralova, H., Crevenna, A. H., Bodakuntla, S., Schlichthaerle, T., Taschner, M., et al. (2018). Direct induction of microtubule branching by microtubule nucleation factor SSNA1. Nature Cell Biology, 20(10), 1172-1180. doi:10.1038/s41556-018-0199-8.


Cite as: https://hdl.handle.net/21.11116/0000-0002-F2CD-6
Abstract
Microtubules are central elements of the eukaryotic cytoskeleton that often function as part of branched networks. Current models for branching include nucleation of new microtubules from severed microtubule seeds or from. gamma-tubulin recruited to the side of a pre-existing microtubule. Here, we found that microtubules can be directly remodelled into branched structures by the microtubule-remodelling factor SSNA1 (also known as NA14 or DIP13). The branching activity of SSNA1 relies on its ability to self-assemble into fibrils in a head-to-tail fashion. SSNA1 fibrils guide protofilaments of a microtubule to split apart to form daughter microtubules. We further found that SSNA1 localizes at axon branching sites and has a key role in neuronal development. SSNA1 mutants that abolish microtubule branching in vitro also fail to promote axon development and branching when overexpressed in neurons. We have, therefore, discovered a mechanism for microtubule branching and implicated its role in neuronal development.