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

ABSTRACT

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.

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