The Lamin-B receptor, found on the TUDOR domain Pfam:PF00567, is a chromatin and lamin binding protein in the inner nuclear membrane. It is one of the integral inner Nuclear Envelope membrane proteins responsible for targeting nuclear membranes to chromatin, being a downstream effector of Ran, a small Ras-like nuclear GTPase which regulates NE assembly. Lamin-B receptor interacts with Importin beta, a Ran-binding protein, thereby directly contributing to the fusion of membrane vesicles and the formation of the NE [1].

1: Lamin B receptor plays a role in stimulating nuclear envelope production and targeting membrane vesicles to chromatin during nuclear envelope assembly through direct interaction with importin beta. Ma Y, Cai S, Lv Q, Jiang Q, Zhang Q, Sodmergen, Zhai Z, Zhang C; J Cell Sci. 2007;120:520-530. PMID:17251381