Karyopherins and condensates

Charis E. Springhower, Michael K. Rosen, Yuh Min Chook

Research output: Contribution to journalReview article

Abstract

Several aggregation-prone RNA-binding proteins, including FUS, EWS, TAF15, hnRNP A1, hnRNP A2, and TDP-43, are mutated in neurodegenerative diseases. The nuclear–cytoplasmic distribution of these proteins is controlled by proteins in the karyopherin family of nuclear transport factors (Kaps). Recent studies have shown that Kaps not only transport these proteins but also inhibit their self-association/aggregation, acting as molecular chaperones. This chaperone activity is impaired for disease-causing mutants of the RNA-binding proteins. Here, we review physical data on the mechanisms of self-association of several disease-associated RNA-binding proteins, through liquid–liquid phase separation and amyloid fiber formation. In each case, we relate these data to biophysical, biochemical, and cell biological data on the inhibition of self-association by Kaps. Our analyses suggest that Kaps may be effective chaperones because they contain large surfaces with diverse physical properties that enable them to engage multiple different regions of their cargo proteins, blocking self-association.

Original languageEnglish (US)
Pages (from-to)112-123
Number of pages12
JournalCurrent Opinion in Cell Biology
Volume64
DOIs
StatePublished - Jun 2020

Keywords

  • Amyloid
  • Chaperone
  • Condensates
  • Exportins
  • Fibrils
  • FUS,EWS,EWSR1
  • hnRNP A1
  • hnRNP A2
  • Importins
  • Karyopherins
  • LARKS
  • Liquid-liquid phase separation
  • LLPS
  • Membraneless organnelles
  • Nuclear export
  • Nuclear import
  • Nuclear Pore Complex
  • Nuclear transport
  • Protein aggregation
  • Ran GTPase
  • Steric zipper
  • TAF15
  • TDP-43
  • Transportin

ASJC Scopus subject areas

  • Cell Biology

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