Heat shock transcription factor 1 (HSF1)

Heat shock transcription factor 1 (HSF1) is a highly conserved transcription factor encoded by the HSF1 gene, functioning as the master regulator of the heat shock response (HSR) pathway in eukaryotic cells. HSF1 is essential for cellular protection against a wide range of stresses, including heat, hypoxia, and toxic agents, by orchestrating the transcription of heat shock proteins and other cytoprotective genes. In unstressed cells, HSF1 exists primarily as an inactive monomer. Upon exposure to proteotoxic stress, HSF1 is released from inhibitory complexes with chaperone proteins (such as Hsp70, Hsp90, and TRiC), trimerizes through its coiled-coil oligomerization domain, and translocates to the nucleus where it binds to specific DNA sequences (heat shock elements) to activate transcription. In addition to its canonical role in stress response, HSF1 also regulates genes associated with development, metabolism, aging, cancer progression, and neurodegeneration. Its activity is tightly regulated by post-translational modifications, interactions with chaperones, and feedback regulatory loops. Due to its central role in proteostasis, HSF1 is being explored as a therapeutic target, particularly in cancers and diseases characterized by abnormal protein folding and aggregation.

Other names

Heat shock factor protein 1Hsf1HSF

Modulation of HSF1 activity (e.g., inhibition of DNA binding, prevention of trimerization, stabilization of inactive forms); Indirect modulation by targeting upstream chaperones (such as Hsp90 or Hsp70) that regulate HSF1 activity.