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http://dx.doi.org/10.14348/molcells.2017.0108

Comparative Interactomes of VRK1 and VRK3 with Their Distinct Roles in the Cell Cycle of Liver Cancer  

Lee, Namgyu (Department of Life Science, Pohang University of Science and Technology)
Kim, Dae-Kyum (Donnelly Centre, Departments of Molecular Genetics and Computer Science, University of Toronto)
Han, Seung Hyun (Department of Life Science, Pohang University of Science and Technology)
Ryu, Hye Guk (Department of Life Science, Pohang University of Science and Technology)
Park, Sung Jin (Department of Life Science, Pohang University of Science and Technology)
Kim, Kyong-Tai (Department of Life Science, Pohang University of Science and Technology)
Choi, Kwan Yong (Department of Life Science, Pohang University of Science and Technology)
Abstract
Vaccinia-related kinase 1 (VRK1) and VRK3 are members of the VRK family of serine/threonine kinases and are principally localized in the nucleus. Despite the crucial roles of VRK1/VRK3 in physiology and disease, the molecular and functional interactions of VRK1/VRK3 are poorly understood. Here, we identified over 200 unreported VRK1/VRK3-interacting candidate proteins by affinity purification and LC-MS/MS. The networks of VRK1 and VRK3 interactomes were found to be associated with important biological processes such as the cell cycle, DNA repair, chromatin assembly, and RNA processing. Interactions of interacting proteins with VRK1/VRK3 were confirmed by biochemical assays. We also found that phosphorylations of XRCC5 were regulated by both VRK1/VRK3, and that of CCNB1 was regulated by VRK3. In liver cancer cells and tissues, VRK1/VRK3 were highly upregulated and its depletion affected cell cycle progression in the different phases. VRK3 seemed to affect S phase progression and G2 or M phase entry and exit, whereas VRK1 affects G1/S transition in the liver cancer, which could be explained by different interacting candidate proteins. Thus, this study not only provides a resource for investigating the unidentified functions of VRK1/VRK3, but also an insight into the regulatory roles of VRK1/VRK3 in biological processes.
Keywords
ESI-MS/MS; interactome; VRK1; VRK3;
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