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 inner membrane of the nucleus is the membrane which separates the nuclear matrix from the intermembrane space. In mammals, the inner nuclear membrane is associated with heterochromatin and the nuclear lamina.
The membrane surrounding the nucleus. This term is used when it is not known if the protein is found in or associated with the inner or outer nuclear membrane.
Acts as component of the Sec62/63 complex which is involved in SRP-independent post-translational translocation across the endoplasmic reticulum (ER) and functions together with the Sec61 complex and bip1 in a channel-forming translocon complex. A cycle of assembly and disassembly of Sec62/63 complex from sec61 may govern the activity of the translocon. sec63 may affect sec61-polypeptide interactions by increasing the affinity of targeting pathways for sec61 and/or by modifying sec61 to allow more efficient polypeptide interaction. May also be involved in SRP-dependent cotranslational translocation (By similarity). {By
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National and Kapodistrian University of Athens
Department of Biology
Biophysics & Bioinformatics Laboratory