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EMBO Rep. 2019 Nov 5;20(11):e47732. doi: 10.15252/embr.201947732. Epub 2019 Sep 5.

Cytolinker Gas2L1 regulates axon morphology through microtubule-modulated actin stabilization.

Author information

1
Department of Biology, Cell Biology, Faculty of Science, Utrecht University, Utrecht, The Netherlands.
2
Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands.
3
Living Matter Department, AMOLF, Amsterdam, The Netherlands.
4
Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Hong Kong, China.

Abstract

Crosstalk between the actin and microtubule cytoskeletons underlies cellular morphogenesis. Interactions between actin filaments and microtubules are particularly important for establishing the complex polarized morphology of neurons. Here, we characterized the neuronal function of growth arrest-specific 2-like 1 (Gas2L1), a protein that can directly bind to actin, microtubules and microtubule plus-end-tracking end binding proteins. We found that Gas2L1 promotes axon branching, but restricts axon elongation in cultured rat hippocampal neurons. Using pull-down experiments and in vitro reconstitution assays, in which purified Gas2L1 was combined with actin and dynamic microtubules, we demonstrated that Gas2L1 is autoinhibited. This autoinhibition is relieved by simultaneous binding to actin filaments and microtubules. In neurons, Gas2L1 primarily localizes to the actin cytoskeleton and functions as an actin stabilizer. The microtubule-binding tail region of Gas2L1 directs its actin-stabilizing activity towards the axon. We propose that Gas2L1 acts as an actin regulator, the function of which is spatially modulated by microtubules.

KEYWORDS:

axon; cytolinker; cytoskeleton; in vitro reconstitution; neuronal development

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