Plays a role in protein ubiquitination, sorting and degradation through its association with cdc-48.1 and/or cdc-48.2. Interacts with cdc-48.1. Expressed in intestine (at protein level). The PUL domain mediates the interaction with cdc-48.1 and/or cdc-48.2 C-terminus. The PFU domain mediates interaction with ubiquitin. Belongs to the WD repeat PLAP family.