Repeat

Pumilio RNA-binding repeat (IPR001313)

Short name: Pumilio_RNA-bd_rpt

Description

Members of the Pumilio family of proteins (Puf) regulate translation and mRNA stability in a wide variety of eukaryotic organisms including mammals, flies, worms, slime mold, and yeast [PMID: 10662662]. Pumilio family members are characterised by the presence of eight tandem copies of an imperfectly repeated 36 amino acids sequence motif, the Pumilio repeat, surrounded by a short N- and C-terminal conserved region. The eight repeats and the N- and C-terminal regions form the Pumilio homology domain (PUM-HD). The PUM-HD domain is a sequence-specific RNA binding domain. Several Puf members have been shown to bind specific RNA sequences mainly found in the 3' UTR of mRNA and repress their translation [PMID: 14584586]. Frequently, Puf proteins function asymmetrically to create protein gradients, thus causing asymmetric cell division and regulating cell fate specification [PMID: 1459455].

Crystal structure of Pumilio repeats has been solved [PMID: 11336708]. The PUM repeat with the N- and C-terminal regions pack together to form a right-handed superhelix that approximates a half doughnut structurally similar to the Armadillo (ARM) repeat proteins, beta-catenin and karyopherin alpha. The RNA binds the concave surface of the molecule, where each of the protein's eight repeats makes contacts with a different RNA base via three amino acid side chains at conserved positions [PMID: 12202039].

This entry represents the Pumilio repeat.

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0003723 RNA binding

Cellular Component

No terms assigned in this category.

Contributing signatures

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