Recombinant Human HSF1 protein (ab115715)

Overview

Description

  • Nature
    Recombinant
  • Source
    Escherichia coli
  • Amino Acid Sequence
    • Accession
    • Species
      Human
    • Molecular weight
      70 kDa including tags
    • Tags
      His tag N-Terminus

Specifications

Our Abpromise guarantee covers the use of ab115715 in the following tested applications.

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

  • Applications

    Western blot

    SDS-PAGE

  • Purity
    >= 90 % SDS-PAGE.
    ab115715 is purified by multi-step chromatography
  • Form
    Liquid
  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped on dry ice. Upon delivery aliquot and store at -80ºC. Avoid freeze / thaw cycles.

    Constituents: 5% Glycerol, 99% Tris buffered saline

General Info

  • Alternative names
    • Heat shock factor 1
    • Heat shock factor protein 1
    • Heat shock transcription factor 1
    • HSF 1
    • hsf1
    • HSF1_HUMAN
    • HSTF 1
    • HSTF1
    see all
  • Function
    DNA-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 similarities
    Belongs to the HSF family.
  • Domain
    the 9aaTAD motif is a transactivation domain present in a large number of yeast and animal transcription factors.
  • Post-translational
    modifications
    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. Phosphorylation on Ser-326 plays an important role in heat activation of HSF1 transcriptional activity.
    Sumoylated with 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 localization
    Cytoplasm. Nucleus. Cytoplasmic during normal growth. On activation, translocates to nuclear stress granules. Colocalizes with SUMO1 in nuclear stress granules.
  • Information by UniProt

Recombinant Human HSF1 protein images

  • Polyclonal HSF1 antibody + Recombinant Human HSF1 protein (ab115715) at 0.01 µg
  • SDS-PAGE analysis
    Lane 1: MW marker
    Lane 2: ab115715 at 2 mg

References for Recombinant Human HSF1 protein (ab115715)

ab115715 has not yet been referenced specifically in any publications.

Product Wall

Thank you for your call last week and for your patience while I have been in touch with the lab regarding your enquiry.

I have heard back from the lab, and they have confirmed that ab117515 is phosphorylated in vitro to produce ab115508.
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