Intermediate filament (IF) protein, component of the nuclear lamina, a fibrous layer on the nucleoplasmic side of the inner nuclear membrane, which is thought to provide a framework for the nuclear envelope (PubMed:26840051). Localizes throughout the nucleoplasm (PubMed:26840051). Contains an alpha-helical IF rod domain organization with three coiled coil-forming segments (coil 1A, coil 1B, and coil 2) (PubMed:26840051). Belongs to the intermediate filament family.