This is a PUB domain (PNGase/UBA- or UBX-containing domain), found in E3 ubiquitin-protein ligase RNF31, also known as Ring finger protein 31 and HOIL-1-interacting protein (HOIP) (EC:2.3.2.27) [1]. RNF31/HOIP is observed to contribute to inborn huma ...
This is a PUB domain (PNGase/UBA- or UBX-containing domain), found in E3 ubiquitin-protein ligase RNF31, also known as Ring finger protein 31 and HOIL-1-interacting protein (HOIP) (EC:2.3.2.27) [1]. RNF31/HOIP is observed to contribute to inborn human immunity disorders, in which RNF31/HOIP missense mutation at PUB domain gives rise to the de-stabilized LUBAC complex (linear ubiquitin chain assembly complex) and subsequently causes the auto-inflammation and immunodeficiency. In addition, RNF31 is reported to modify ERK and JNK pathways leading to cisplatin resistance [2]. Functional studies indicate that HOIP and OTULIN interact and act as a bimolecular editing pair for linear ubiquitin signals where the HOIP-PUB domain binds to the PUB interacting motif (PIM) of OTULIN and the chaperone VCP/p9. This interaction plays an important role where the HOIP binding to OTULIN is required for the recruitment of OTULIN to the TNF receptor complex and to counteract HOIP-dependent activation of the NF-KB pathway [3 , 4].
The PUB (also known as PUG) domain is found in peptide N-glycanase where it functions as a AAA ATPase binding domain [1]. This domain is also found on other proteins linked to the ubiquitin-proteasome system.
