VRK2A is an A-type lamin–dependent nuclear envelope kinase that phosphorylates BAF

Author:

Birendra KC 1,May Danielle G.1,Benson Benjamin V.1,Kim Dae In1,Shivega Winnie G.1,Ali Manaal H.1,Faustino Randolph S.12,Campos Alexandre R.3,Roux Kyle J.12

Affiliation:

1. Sanford Children's Health Research Center, Sanford Research, Sioux Falls, SD 57104

2. Department of Pediatrics, Sanford School of Medicine, University of South Dakota, Sioux Falls, SD 57105

3. Proteomics Facility, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037

Abstract

The nuclear envelope (NE) is critical for numerous fundamental cellular functions, and mutations in several NE constituents can lead to a heterogeneous spectrum of diseases. We used proximity biotinylation to uncover new constituents of the inner nuclear membrane (INM) by comparative BioID analysis of lamin A, Sun2 and a minimal INM-targeting motif. These studies identify vaccinia-related kinase-2 (VRK2) as a candidate constituent of the INM. The transmembrane VRK2A isoform is retained at the NE by association with A-type lamins. Furthermore, VRK2A physically interacts with A-type, but not B-type, lamins. Finally, we show that VRK2 phosphorylates barrier to autointegration factor (BAF), a small and highly dynamic chromatin-binding protein, which has roles including NE reassembly, cell cycle, and chromatin organization in cells, and subtly alters its nuclear mobility. Together these findings support the value of using BioID to identify unrecognized constituents of distinct subcellular compartments refractory to biochemical isolation and reveal VRK2A as a transmembrane kinase in the NE that regulates BAF.

Publisher

American Society for Cell Biology (ASCB)

Subject

Cell Biology,Molecular Biology

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