Rapid and reversible relocalization of heat shock factor 1 within seconds to nuclear stress granules

Caroline Jolly, Yves Usson, Richard I. Morimoto*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


Heat shock factor 1 (HSF1) is essential for the stress-induced expression of heat shock genes. On exposure to heat shock, HSF1 localizes within seconds to discrete nuclear granules. On recovery from heat shock, HSF1 rapidly dissipates from these stress granules to a diffuse nucleoplasmic distribution, typical of unstressed cells. Subsequent re-exposure to heat shock results in the rapid relocalization of HSF1 to the same stress granules with identical kinetics. Although the appearance of HSF1 stress granules corresponds to the hyperphosphorylated, trimeric DNA-binding state of HSF1 and correlates temporally with the inducible transcription of heat shock genes, they are also present in heat-shocked mitotic cells that are devoid of transcription. This finding suggests a role for HSF1 stress granules as a nuclear compartment for the temporal regulation and spatial organization of HSF1 activity and reveals new features of the dynamics of nuclear organization.

Original languageEnglish (US)
Pages (from-to)6769-6774
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number12
StatePublished - Jun 8 1999


  • Dynamics
  • Green fluorescent protein
  • Heat shock
  • Nuclear organization
  • Nuclear structures

ASJC Scopus subject areas

  • General


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