The nuclear envelope is a membrane system which surrounds the nucleoplasm of eukaryotic cells. It is composed of the nuclear lamina, nuclear pore complexes and two nuclear membranes. The space between the two membranes is called the nuclear intermembrane space.
Required for nuclear protein import, its predominant substrate seems to be ribosomal proteins. Binds to nucleoporins and the GTP-bound form of gsp1 (Ran) (By similarity). {By
Similarity}.