This domain is predominantly found in the amino terminal region of Ubiquitin carboxyl-terminal hydrolase 8 (USP8). It forms a five helical bundle that dimerises [1].

1: Amino-terminal dimerization, NRDP1-rhodanese interaction, and inhibited catalytic domain conformation of the ubiquitin-specific protease 8 (USP8). Avvakumov GV, Walker JR, Xue S, Finerty PJ Jr, Mackenzie F, Newman EM, Dhe-Paganon S; J Biol Chem. 2006;281:38061-38070. PMID:17035239