Nucleoporin essential for nuclear pore assembly and fusion, nuclear pore spacing, as well as structural integrity. Forms dimers and possibly higher-order oligomers. N-glycosylated, but not all potential glycosylation sites may be used. Contains high-mannose type oligosaccharides. Phosphorylated at Ser-1880 in mitosis specifically; not phosphorylated in interphase. Belongs to the NUP210 family.