TF family name

Heat shock factor (HSF)-type, DNA-binding

Desription

Heat shock factor (HSF) is a transcriptional activator of heat shock genes : it binds specifically to heat shock promoter elements, which are palindromic sequences rich with repetitive purine and pyrimidine motifs. Under normal conditions, HSF is a homo-trimeric cytoplasmic protein, but heat shock activation results in relocalisation to the nucleus. Each HSF monomer contains one C-terminal and three N-terminal leucine zipper repeats. Point mutations in these regions result in disruption of cellular localisation, rendering the protein constitutively nuclear. Two sequences flanking the N-terminal zippers fit the consensus of a bi- partite nuclear localisation signal (NLS). Interaction between the N- and C-terminal zippers may result in a structure that masks the NLS sequences: following activation of HSF, these may then be unmasked, resulting in relocalisation of the protein to the nucleus. The DNA-binding component of HSF lies to the N-terminus of the first NLS region, and is referred to as the HSF domain.

Criteria

There is no defined InterPro Term for selection creteria.

# of TFs

3 TFs in 4 Fusarium species

References

5 reference(s) found in this TF family

Subcellular localization

PSORT2: 0 (0.00 %)
pTARGET: 0 (0.00 %)
List for Subcellular information

TF Family map

TF Family Map of Heat shock factor (HSF)-type, DNA-binding