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Updated: Jan 3, 2026

De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data
Published on: February 18, 2022
Upstream ORF-Encoded ASDURF Is a Novel Prefoldin-like Subunit of the PAQosome
Philippe Cloutier1, Christian Poitras1, Denis Faubert1
1Institut de Recherches Cliniques de Montréal , 110 Avenue des Pins Ouest , Montréal , Quebec H2W 1R7 , Canada.
Abstract:
The PAQosome is an 11-subunit chaperone involved in the biogenesis of several human protein complexes. We show that ASDURF, a recently discovered upstream open reading frame (uORF) in the 5' UTR of ASNSD1 mRNA, encodes the 12th subunit of the PAQosome. ASDURF displays significant structural homology to β-prefoldins and assembles with the five known subunits of the prefoldin-like module of the PAQosome to form a heterohexameric prefoldin-like complex. A model of the PAQosome prefoldin-like module is presented. The data presented here provide an example of a eukaryotic uORF-encoded polypeptide whose function is not limited to cis-acting translational regulation of downstream coding sequence and highlights the importance of including alternative ORF products in proteomic studies.
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