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KMID : 0620920190510040044
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Experimental & Molecular Medicine
2019 Volume.51 No. 4 p.44 ~ p.44
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Phosphoregulation of the oncogenic protein regulator of cytokinesis 1 (PRC1) by the atypical CDK16/CCNY complex
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Hernandez-Ortega Sara
Sanchez-Botet Abril
Quandt Eva
Masip Nuria
Gasa Laura
Verde Gaetano
Jimenez Javier
Levin Rebecca S.
Rutaganira Florentine U.
Burlingame Alma L.
Wolfgeher Don
Ribeiro Mariana P. C.
Kron Stephen J.
Shokat Kevan M.
Clotet Josep
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Abstract
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CDK16 (also known as PCTAIRE1 or PCTK1) is an atypical member of the cyclin-dependent kinase (CDK) family that forms an active complex with cyclin Y (CCNY). Although both proteins have been recently implicated in cancer pathogenesis, it is still unclear how the CDK16/CCNY complex exerts its biological activity. To understand the CDK16/CCNY network, we used complementary proteomic approaches to identify potential substrates of this complex. We identified several candidates implicating the CDK16/CCNY complex in cytoskeletal dynamics, and we focused on the microtubule-associated protein regulator of cytokinesis (PRC1), an essential protein for cell division that organizes antiparallel microtubules and whose deregulation may drive genomic instability in cancer. Using analog-sensitive (AS) CDK16 generated by CRISPR-Cas9 mutagenesis in 293T cells, we found that specific inhibition of CDK16 induces PRC1 dephosphorylation at Thr481 and delocalization to the nucleus during interphase. The observation that CDK16 inhibition and PRC1 downregulation exhibit epistatic effects on cell viability confirms that these proteins can act through a single pathway. In conclusion, we identified PRC1 as the first substrate of the CDK16/CCNY complex and demonstrated that the proliferative function of CDK16 is mediated by PRC1 phosphorylation. As CDK16 is emerging as a critical node in cancer, our study reveals novel potential therapeutic targets.
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KEYWORD
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Cell division, Cytoskeleton, Protein?protein interaction networks
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