• Product nameAnti-HSF1 antibody [4B4]
    See all HSF1 primary antibodies
  • Description
    Rat monoclonal [4B4] to HSF1
  • Tested applicationsICC/IF, WB, IPmore details
  • Species reactivity
    Reacts with: Mouse, Rat, Human
  • Immunogen

    Recombinant fragment, corresponding to amino acids 1-503 of Mouse HSF1

  • EpitopeAmino acids 378-395 of mouse HSF1
  • Positive control
    • LS174T or MAD109 cells



Our Abpromise guarantee covers the use of ab44819 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

Application Abreviews Notes
ICC/IF Use at an assay dependent dilution.
WB 1/200. Predicted molecular weight: 57 kDa.
IP 1/400.


  • FunctionDNA-binding protein that specifically binds heat shock promoter elements (HSE) and activates transcription. In higher eukaryotes, HSF is unable to bind to the HSE unless the cells are heat shocked.
  • Sequence similaritiesBelongs to the HSF family.
  • Domainthe 9aaTAD motif is a transactivation domain present in a large number of yeast and animal transcription factors.
  • Post-translational
    Phosphorylated on multiple serine residues, a subset of which are involved in stress-related regulation of transcription activation. Constitutive phosphorylation represses transcriptional activity at normal temperatures. Levels increase on specific residues heat-shock and enhance HSF1 transactivation activity. Phosphorylation on Ser-307 derepresses activation on heat-stress and in combination with Ser-303 phosphorylation appears to be involved in recovery after heat-stress. Phosphorylated on Ser-230 by CAMK2, in vitro. Cadmium also enhances phosphorylation at this site. Phosphorylation on Ser-303 is a prerequisite for HSF1 sumoylation. Phosphorylation on Ser-121 inhibits transactivation and promotes HSP90 binding. Phosphorylation on Thr-142 also mediates transcriptional activity induced by heat.
    Sumoylated by SUMO1 and SUMO2 on heat-shock. Heat-inducible sumoylation occurs after 15 min of heat-shock, after which levels decrease and at 4 hours, levels return to control levels. Sumoylation has no effect on HSE binding nor on transcriptional activity. Phosphorylation on Ser-303 is a prerequisite for sumoylation.
  • Cellular localizationCytoplasm. Nucleus. Cytoplasmic during normal growth. On activation, translocates to nuclear stress granules. Colocalizes with SUMO1 in nuclear stress granules.
  • Information by UniProt
  • Database links
  • Alternative names
    • Heat shock factor 1 antibody
    • Heat shock factor protein 1 antibody
    • Heat shock transcription factor 1 antibody
    • HSF 1 antibody
    • hsf1 antibody
    • HSF1_HUMAN antibody
    • HSTF 1 antibody
    • HSTF1 antibody
    see all

References for Anti-HSF1 antibody [4B4] (ab44819)

This product has been referenced in:
  • Lecomte S  et al. Unraveling complex interplay between heat shock factor 1 and 2 splicing isoforms. PLoS One 8:e56085 (2013). WB ; Mouse . Read more (PubMed: 23418516) »
  • Jiang YQ  et al. Increased heat shock transcription factor 1 in the cerebellum reverses the deficiency of Purkinje cells in Alzheimer's disease. Brain Res 1519:105-11 (2013). Read more (PubMed: 23665061) »

See all 2 Publications for this product

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