PI31 proteasome regulator, N-terminal (IPR021625)

Short name: PI31_Prot_N

Overlapping homologous superfamilies


Domain relationships



PI31 is a regulatory subunit of the immuno-proteasome which is an inhibitor of the 20S proteasome in vitro. PI31 is also an Fbxo7. Skp1 binding partner. Fbxo7 is an F-box protein, which are the substrate-recognition components of the Skp1-Cul1-F box protein (SCF) E3 ubiquitin ligases. The interaction between PI31 and Fbxo7.Skp1 occurs via the beta sheets of a N-terminal domain present in both proteins and known as FP(Fbxo7/PI31) domain. The structure of PI31 FP domain contains a novel alpha/beta-fold and two intermolecular contact surfaces. This entry represents the N-terminal domain of the PI31 proteasome regulator [PMID: 18495667].

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.