The RAWUL domain is found at the C-terminus of poly-comb group RING finger proteins. It is a ubiquitin-like domain [1]. RAWUL binds directly to PUFD, a domain on BCOR proteins (BCL6 corepressor). BCOR has emerged as an important player in development and health [2].

1: Ring1B contains a ubiquitin-like docking module for interaction with Cbx proteins. Bezsonova I, Walker JR, Bacik JP, Duan S, Dhe-Paganon S, Arrowsmith CH; Biochemistry. 2009;48:10542-10548. PMID:19791798

2: Structure of the polycomb group protein PCGF1 in complex with BCOR reveals basis for binding selectivity of PCGF homologs. Junco SE, Wang R, Gaipa JC, Taylor AB, Schirf V, Gearhart MD, Bardwell VJ, Demeler B, Hart PJ, Kim CA; Structure. 2013;21:665-671. PMID:23523425