Fe-S cluster coordination of the chromokinesin KIF4A alters its subcellular localization during mitosis

Journal of Cell Science
Lilach Ben-ShimonShay Ben-Aroya

Abstract

Fe-S clusters act as co-factors of proteins with diverse functions, for example, in DNA repair. Downregulation of the cytosolic iron-sulfur protein assembly (CIA) machinery promotes genomic instability through the inactivation of multiple DNA repair pathways. Furthermore, CIA deficiencies are associated with so far unexplained mitotic defects. Here, we show that CIA2B (also known as FAM96B) and MMS19, constituents of the CIA targeting complex involved in facilitating Fe-S cluster insertion into cytosolic and nuclear target proteins, colocalize with components of the mitotic machinery. Downregulation of CIA2B and MMS19 impairs the mitotic cycle. We identify the chromokinesin KIF4A as a mitotic component involved in these effects. KIF4A binds a Fe-S cluster in vitro through its conserved cysteine-rich domain. We demonstrate in vivo that this domain is required for the mitosis-related KIF4A localization and for the mitotic defects associated with KIF4A knockout. KIF4A is the first identified mitotic component carrying such a post-translational modification. These findings suggest that the lack of Fe-S clusters in KIF4A upon downregulation of the CIA targeting complex contributes to the mitotic defects.

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Citations

Jan 15, 2020·Annual Review of Biochemistry·Roland Lill, Sven-A Freibert
Feb 17, 2021·Liver International : Official Journal of the International Association for the Study of the Liver·Sjoukje-Marije HaismaCleo C van Diemen

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