ABSTRACT Cell division ends when two daughter cells physically separate via abscission, the cleavage of the intercellular bridge. It is not clear how the anti-parallel microtubule bundles bridging daughter cells are severed. Here, we present a novel abscission mechanism. We identified chromokinesin KIF4A, which is adjacent to the midbody during cytokinesis, as being required for efficient abscission. KIF4A is regulated by post-translational modifications. We evaluated modification of KIF4A by the ubiquitin-like protein SUMO. We mapped lysine 460 in KIF4A as the SUMO acceptor site and employed CRISPR-Cas9-mediated genome editing to block SUMO conjugation of endogenous KIF4A. Failure to SUMOylate this site in KIF4A delayed cytokinesis. SUMOylation of KIF4A enhanced the affinity for the microtubule destabilizer stathmin 1 (STMN1). We here present a new level of abscission regulation through the dynamic interactions between KIF4A and STMN1 as controlled by SUMO modification of KIF4A. Summary: A new mechanism of abscission regulation is identified through the dynamic interactions between KIF4A and stathmin 1 as controlled by SUMO modification of KIF4A.
Chromokinesin KIF4A teams up with stathmin 1 to regulate abscission in a SUMO-dependent manner
Sabine A. G. Cuijpers,Edwin Willemstein,J. Ruppert,Daphne M. van Elsland,W. Earnshaw,A. Vertegaal
Published 2020 in Journal of Cell Science
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- Publication year
2020
- Venue
Journal of Cell Science
- Publication date
2020-01-01
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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