Zinc finger, UBR-type (IPR003126)

Short name: Znf_UBR

Overlapping homologous superfamilies


Domain relationships



It has been observed that the identity of N-terminal residues of a protein is related to the half life of the protein. This observation yields a rule, called the N-end rule [PMID: 8901547]. Similar but distinct versions of the N-end rule operate in all organisms examined, from mammals to fungi and bacteria. In eukaryotes, the N-end rule pathway is a part of the ubiquitin degradation system. Some proteins that have a very short half life contain a specific motif at their N terminus, the N-degron. It consists of a destabilising N-terminal residue and an internal Lys, which is the site of poly-Ub chain [PMID: 8901547, PMID: 10545113].

The UBR1 protein was shown to bind specifically to proteins bearing N-terminal residues that are destabilising according to the N-end rule, but not to otherwise identical proteins bearing stabilising N-terminal residues [PMID: 10581257]. UBR1 contains an N-terminal conserved region (the UBR-type zinc finger) which is also found in various proteins implicated in N-degron recognition. The UBR-type zinc finger defines a unique E3 class, most likely N-degron specific [PMID: 16055722].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0008270 zinc ion binding

Cellular Component

No terms assigned in this category.

Contributing signatures

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