Brr6_like_C_C is the highly conserved C-terminal region of a group of proteins found in fungi. It carries four highly conserved cysteine residues. It is suggested that members of the family interact with each other via di-sulfide bridges to form a complex which is involved in nucleocytoplasmic transport [1]. Brr6 in yeast is an essential integral membrane protein of the NE-ER, wit two predicted transmembrane domains, and is a dosage suppressor of Apq12, Pfam:PF12716 [2].

1: Brl1p -- a novel nuclear envelope protein required for nuclear transport. Saitoh YH, Ogawa K, Nishimoto T; Traffic. 2005;6:502-517. PMID:15882446

2: Integral membrane proteins Brr6 and Apq12 link assembly of the nuclear pore complex to lipid homeostasis in the endoplasmic reticulum. Hodg CA, Choudhary V, Wolyniak MJ, Scarcelli JJ, Schneiter R, Col CN; J Cell Sci. 2010;123:141-151. PMID:20016074