The Multiple Functions of the PAQosome: An R2TP- and URI1 Prefoldin-Based Chaperone Complex

  • Jeffrey Lynham
  • Walid A. HouryEmail author
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 1106)


The PAQosome (Particle for Arrangement of Quaternary structure) is a large multisubunit chaperone complex that is essential for the assembly and stabilization of other macromolecular complexes. It also interacts with several chaperones including Hsp90, Hsp70, and CCT. The PAQosome is comprised of the R2TP complex, the URI1 prefoldin complex (also known as the non-canonical prefoldin-like complex), the RNA polymerase subunit RPB5, and the WD40 repeat protein WDR92. The R2TP complex is conserved among eukaryotes and has been comprehensively studied over the last 13 years. The R2TP complex is known for its involvement in the assembly and stabilization of L7Ae ribonucleoproteins, U5 small nuclear ribonucleoprotein, RNA polymerase II, phosphatidylinositol-3-kinase-related proteins (PIKKs), and the tuberous sclerosis complex (TSC1-TSC2). By contrast, the URI1 prefoldin complex has evolved exclusively in higher metazoans. Although the URI1 prefoldin complex was initially reported more than 15 years ago, little is known about its function and its role within the PAQosome. Given that URI1 is overexpressed in many types of cancer, it is surprising that the URI1 prefoldin complex has been overlooked. This chapter provides an update on the recent progress uncovering the physiological roles of each PAQosome subunit and provides an overview of the potential functions of the URI1 prefoldin complex.


Molecular chaperones R2TP URI1 PAQosome RNA polymerase assembly Non-canonical prefoldin complex Quaternary structure snoRNP biogenesis PIKK stabilization U5 snRNP TSC 



We thank members of the Houry group for careful reading of the manuscript. This work was funded by the Canadian Institutes of Health Research grant MOP-93778 to WAH.


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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Department of BiochemistryUniversity of TorontoTorontoCanada
  2. 2.Department of ChemistryUniversity of TorontoTorontoCanada

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