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.
The nuclear lamina is a meshwork of intermediate filament proteins called lamins and lamin-binding proteins that are embedded in the inner nuclear membrane.
Functions in tethering peripheral heterochromatin to the nuclear lamina during interphase, possibly through the interaction with heterochromatin protein CBX5/HP1 alpha. Might play a role in reattaching heterochromatin to the nuclear lamina at mitotic exit. Promotes myoblast differentiation during skeletal myogenesis, possibly by stimulating transcription factor MyoD activity via binding to CBX5/HP1 alpha. Involved in the positive regulation of the PI3K-Akt- mTOR signaling pathway and in promoting cell proliferation, possibly via binding to GRB2 (By similarity). {By
SimilarityUniProtKB:Q9BWN1}.