DNA-binding protein which plays an essential role in nuclear envelope formation. Required for normal chromosome segregation during mitosis. Associates with the nuclear lamina via its interaction with LEM domain containing proteins emr-1 and lem-2 (By similarity). Interacts with emr-1 and lem-2. Interacts with lem-4l, leading to decreased phosphorylation by VRK1 and promoting dephosphorylation by protein phosphatase 2A (PP2A) (By similarity). Phosphorylated by vrk-1. Phosphorylation by vrk-1 in mitosis is essential to achieve correct timing of recruitment of nuclear envelope components during nuclear envelope assembly. Dephosphorylated by protein phosphatase 2A (PP2A) following interaction with lem-4l during mitotic exit, leading to mitotic nuclear envelope reassembly (By similarity). Belongs to the BAF family.