Nucleus inner membrane protein involved in meiosis (PubMed:20404563). Plays a role in regulating nuclear envelope (NE) morphology and nuclear integrity, particularly during spindle pole body (SPB) extrusion or insertion through the NE, and perhaps during karyokinesis (PubMed:28242692). Modest growth deficit (PubMed:28242692). Suppresses slow growth rates of spores and severe nuclear envelope (NE) morphology defects of vps4 mutants (PubMed:18692466).