NudCL2 is required for cytokinesis by stabilizing RCC2 with Hsp90 at the midbody
Xiaoyang Xu , Yuliang Huang , Feng Yang , Xiaoxia Sun , Rijin Lin , Jiaxing Feng , Mingyang Yang , Jiaqi Shao , Xiaoqi Liu , Tianhua Zhou , Shanshan Xie , Yuehong Yang
Protein Cell ›› 2024, Vol. 15 ›› Issue (10) : 766 -782.
NudCL2 is required for cytokinesis by stabilizing RCC2 with Hsp90 at the midbody
Cytokinesis is required for faithful division of cytoplasmic components and duplicated nuclei into two daughter cells. Midbody, a protein-dense organelle that forms at the intercellular bridge, is indispensable for successful cytokinesis. However, the regulatory mechanism of cytokinesis at the midbody still remains elusive. Here, we unveil a critical role for NudC-like protein 2 (NudCL2), a co-chaperone of heat shock protein 90 (Hsp90), in cytokinesis regulation by stabilizing regulator of chromosome condensation 2 (RCC2) at the midbody in mammalian cells. NudCL2 localizes at the midbody, and its downregulation results in cytokinesis failure, multinucleation, and midbody disorganization. Using iTRAQ-based quantitative proteomic analysis, we find that RCC2 levels are decreased in NudCL2 knockout (KO) cells. Moreover, Hsp90 forms a complex with NudCL2 to stabilize RCC2, which is essential for cytokinesis. RCC2 depletion mirrors phenotypes observed in NudCL2-downregulated cells. Importantly, ectopic expression of RCC2 rescues the cytokinesis defects induced by NudCL2 deletion, but not vice versa. Together, our data reveal the significance of the NudCL2/Hsp90/RCC2 pathway in cytokinesis at the midbody.
cytokinesis / midbody / NudCL2 / Hsp90 / RCC2
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The Author(s) 2024. Published by Oxford University Press on behalf of Higher Education Press.
Supplementary files
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