Nurim (NRM)

Nurim is an inner nuclear membrane (INM) protein that was first isolated in a visual screen for nuclear envelope-localizing proteins. Nurim lacks an N-terminal domain characteristic of other INM proteins examined to date and may represent a class of proteins that localize to the INM by a distinct mechanism.

Results from immunoprobing and protease protection assays together with other analyses indicate that nurim is a six transmembrane-spanning protein and contains a hairpin turn in its C-terminal transmembrane domain, resulting in the N and C termini residing on the same side of the membrane. In biochemical fractionation, nurim remained extremely tightly bound to nuclear fractions and was released in significant quantities only in the presence of 4 m urea.