The heat-shock response is elicited by exposure of cells to thermal and chemical stress and through the activation of HSFs (heat shock factors) results in the elevated expression of heat-shock induced genes. Heat shock factor binding protein 1 (HSBP1), is a 76-amino-acid protein that binds to heat shock factor 1(HSF1), which is a transcription factor involved in the HS response. During HS response, HSF1 undergoes conformational transition from an inert non-DNA-binding monomer to active functional trimers. HSBP1 is nuclear-localized and interacts with the active trimeric state of HSF1 to negatively regulate HSF1 DNA-binding activity. Overexpression of HSBP1 in mammalian cells represses the transactivation activity of HSF1. When overexpressed in C.elegans HSBP1 has severe effects on survival of the animals after thermal and chemical stress consistent with a role of HSBP1 as a negative regulator of heat shock response. [provided by RefSeq, Jul 2008]
Function:
The budding yeast Saccharomyces cerevisiae has two genes, HSP82 and HSC82, that encode homologues of HSP90. HSC82 is a molecular chaperone that promotes the maturation, structural maintenance and proper regulation of specific target proteins involved in cell cycle control. Cells overexpressing Hsc82 are hypersensitive to various stresses including high concentrations of NaCl. The phenotypes associated with the sensitivity to salt stress of Hsc82-overexpressing cells are similar to those of calcineurin-defective mutants.
Subcellular Location:
Cytoplasmic and Mitochondrial
SWISS:
P15108
Gene ID:
855224
Database links:
Entrez Gene: 855224 Saccharomyces cerevisiae
SwissProt: P15108 Saccharomyces cerevisiae
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