Thermo Fisher Scientific HSF1 Polyclonal Antibody

Thermo Fisher Scientific HSF1 Polyclonal Antibody

Applications and Tested Dilution

Product Specifications

Product Specific Information

• Recommended shelf life: 1 year from date of receipt
• Application Note: For IHC, epitope retrieval with citrate buffer pH 6.0 is recommended for FFPE tissue sections.

Target Information

All organisms respond to elevated temperatures and various environmental stresses by rapid synthesis of heat shock RNAs and proteins. The regulation of heat shock gene transcription is mediated by the transcriptional activator, Heat Shock Factor (HSF), which binds to Heat Shock Response Elements (HSEs).
These HSEs consist of three repeats of a 5-nucleotide {nGAAn} module, arranged in alternating orientation upstream of heat shock genes. Although HSEs are highly conserved, HSFs from yeast, Drosophila, and human differ in molecular weight and do not show significant immunological cross-reactivity.

In human cells, two HSFs have been identified: HSF1 and HSF2. They bind to the same HSEs and share 38% sequence identity. HSF1 responds to classical stress signals such as heat, heavy metals, and oxidative reagents, while HSF2 is activated during hemin-mediated differentiation of human erythroleukemia cells.

HSF1 exists constitutively in the cytoplasm and nucleus of unstressed cells as a monomer without DNA binding activity. Upon stress, HSF1 becomes activated to a nuclear-localized trimeric form that binds DNA. Phosphorylation of HSF1 is necessary for maximal transcription of heat shock genes.

For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.