Using fluorescence anisotropy to monitor chaperone dispersal of RNA-binding protein condensates

STAR Protoc. 2022 May 18;3(2):101409. doi: 10.1016/j.xpro.2022.101409. eCollection 2022 Jun 17.


Heat stress triggers a specific set of proteins in budding yeast to form solid-like biomolecular condensates, which are dispersed by molecular chaperones. Here, we describe a protocol to study the kinetics of chaperone-facilitated condensate dispersal using biochemical reconstitution and fluorescence anisotropy. Although the current protocol is tailored to study heat-induced condensates of poly(A)-binding protein (Pab1), the protocol can be modified to study any protein which shows differential substrate binding activity upon condensation. For complete details on the use and execution of this protocol, please refer to Yoo et al. (2022).

Keywords: Biophysics; Cell Biology; Molecular Biology; Protein Biochemistry.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, N.I.H., Extramural

MeSH terms

  • Fluorescence Polarization
  • Heat-Shock Response
  • Molecular Chaperones* / metabolism
  • Poly(A)-Binding Proteins / metabolism
  • RNA-Binding Proteins* / chemistry


  • Molecular Chaperones
  • Poly(A)-Binding Proteins
  • RNA-Binding Proteins