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Oxidation of F-actin controls the terminal steps of cytokinesis
Abstract
Cytokinetic abscission, the terminal step of cell division, crucially depends on the local constriction of ESCRT-III helices after cytoskeleton disassembly. While the microtubules of the intercellular bridge are cut by the ESCRT-associated enzyme Spastin, the mechanism that clears F-actin at the abscission site is unknown. Here we show that oxidation-mediated depolymerization of actin by the redox enzyme MICAL1 is key for ESCRT-III recruitment and successful abscission. MICAL1 is recruited to the abscission site by the Rab35 GTPase through a direct interaction with a flat three-helix domain found in MICAL1 C terminus. Mechanistically, in vitro assays on single actin filaments demonstrate that MICAL1 is activated by Rab35. Moreover, in our experimental conditions, MICAL1 does not act as a severing enzyme, as initially thought, but instead induces F-actin depolymerization from both ends. Our work reveals an unexpected role for oxidoreduction in triggering local actin depolymerization to control a fundamental step of cell division.
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In the simplified model, co-residence of TBC1D5 and TBC1D13 to a pseudo-helical Retromer coated tubule would ensure that membrane exiting the retrieval sub-domain has RAB7 in an inactive state (lacks late endosomal identity) and is devoid of active RAB35, restricting association of its effector MICAL1 and preventing F-actin disassembly while simultaneously allowing ARF6 activation to aid recycling
“The most simplified model to describe a highly dynamic and highly complex set of associations, is that the co-residence of TBC1D5 and TBC1D13 to a pseudo-helical Retromer coated tubule would ensure that membrane exiting the retrieval sub-domain has RAB7 in an inactive state”
From Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation (2025) · cites this paper as [124]
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Parallels Between Cytokinesis and Retroviral Budding: A Role for the ESCRT Machinery
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Human ESCRT and ALIX proteins interact with proteins of the midbody and function in cytokinesis
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Vietri, M., Radulovic, M., & Stenmark, H. (2020) · Nature Reviews Molecular Cell Biology · doi:10.1038/s41580-019-0177-4 · Cited by 962
Mapping of endosomal proximity proteomes reveals Retromer as a hub for RAB GTPase regulation
Antón-Plágaro, C., Chen, K.-E., Guo, Q., Liu, M., Evans, A. J., Lewis, P. A., Heesom, K. J., Wilkinson, K. A., Collins, B. M., & Cullen, P. J. (2025) · Nature Communications · doi:10.1038/s41467-025-61802-1 · Cited by 14
Metadata
- Authors
- Frémont, S., Hammich, H., Bai, J., Wioland, H., Klinkert, K., Rocancourt, M., Kikuti, C., Stroebel, D., Romet-Lemonne, G., Pylypenko, O., Houdusse, A., & Echard, A.
- ORCID
- Wioland, Hugo
- Venue
- Nature Communications
- Published
- 2017-02-23
- Volume
- 8
- Issue
- 1
- ISSN
- 2041-1723
- PMC
- PMC5331220
- Cited by
- 181
- References
- 2
- Language
- en
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