Phospho-HSF1 (S326) Recombinant Rabbit Monoclonal Antibody [SU31-03] (ET1608-11)

UNIPROT #

Q00613

PROTEIN NAME

Phospho-HSF1 (S326)

SYNONYMS

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

SEQUENCE SIMILARITIES

Belongs to the HSF family.

POST-TRANSLATIONAL MODIFICATION

Phosphorylated. Phosphorylated in unstressed cells; this phosphorylation is constitutive and implicated in the repression of HSF1 transcriptional activity. Phosphorylated on Ser-121 by MAPKAPK2; this phosphorylation promotes interaction with HSP90 proteins and inhibits HSF1 homotrimerization, DNA-binding and transactivation activities. Phosphorylation on Ser-303 by GSK3B/GSK3-beta and on Ser-307 by MAPK3 within the regulatory domain is involved in the repression of HSF1 transcriptional activity and occurs in a RAF1-dependent manner. Phosphorylation on Ser-303 and Ser-307 increases HSF1 nuclear export in a YWHAE- and XPO1/CRM1-dependent manner. Phosphorylation on Ser-307 is a prerequisite for phosphorylation on Ser-303. According to PubMed:9535852, Ser-303 is not phosphorylated in unstressed cells. Phosphorylated on Ser-419 by PLK1; phosphorylation promotes nuclear translocation upon heat shock. Hyperphosphorylated upon heat shock and during the attenuation and recovery phase period of the heat shock response. Phosphorylated on Thr-142; this phosphorylation increases HSF1 transactivation activity upon heat shock. Phosphorylation on Ser-230 by CAMK2A; this phosphorylation enhances HSF1 transactivation activity upon heat shock. Phosphorylation on Ser-326 by MAPK12; this phosphorylation enhances HSF1 nuclear translocation, homotrimerization and transactivation activities upon heat shock. Phosphorylated on Ser-320 by PRKACA/PKA; this phosphorylation promotes nuclear localization and transcriptional activity upon heat shock. Phosphorylated on Ser-363 by MAPK8; this phosphorylation occurs upon heat shock, induces HSF1 translocation into nuclear stress bodies and negatively regulates transactivation activity. Neither basal nor stress-inducible phosphorylation on Ser-230, Ser-292, Ser-303, Ser-307, Ser-314, Ser-319, Ser-320, Thr-323, Ser-326, Ser-338, Ser-344, Ser-363, Thr-367, Ser-368 and Thr-369 within the regulatory domain is involved in the regulation of HSF1 subcellular localization or DNA-binding activity; however, it negatively regulates HSF1 transactivation activity. Phosphorylated on Ser-216 by PLK1 in the early mitotic period; this phosphorylation regulates HSF1 localization to the spindle pole, the recruitment of the SCF(BTRC) ubiquitin ligase complex inducing HSF1 degradation, and hence mitotic progression. Dephosphorylated on Ser-121, Ser-307, Ser-314, Thr-323 and Thr-367 by phosphatase PPP2CA in an IER5-dependent manner, leading to HSF1-mediated transactivation activity.; Sumoylated with SUMO1 and SUMO2 upon heat shock in a ERK2-dependent manner. Sumoylated by SUMO1 on Lys-298; sumoylation occurs upon heat shock and promotes its localization to nuclear stress bodies and DNA-binding activity. Phosphorylation on Ser-303 and Ser-307 is probably a prerequisite for sumoylation.; Acetylated on Lys-118; this acetylation is decreased in a IER5-dependent manner. Acetylated on Lys-118, Lys-208 and Lys-298; these acetylations occur in a EP300-dependent manner. Acetylated on Lys-80; this acetylation inhibits DNA-binding activity upon heat shock. Deacetylated on Lys-80 by SIRT1; this deacetylation increases DNA-binding activity.; Ubiquitinated by SCF(BTRC) and degraded following stimulus-dependent phosphorylation at Ser-216 by PLK1 in mitosis. Polyubiquitinated. Undergoes proteasomal degradation upon heat shock and during the attenuation and recovery phase period of the heat shock response.

SUBCELLULAR LOCATION

Cytoplasm, Nucleus.

FUNCTION

Heat shock factor 1 (HSF1) is a protein that in humans is encoded by the HSF1 gene. HSF1 is highly conserved in eukaryotes and is the primary mediator of transcriptional responses to proteotoxic stress with important roles in non-stress regulation such as development and metabolism. The HSF1 protein regulates the heat shock response (HSR) pathway in humans by acting as the major transcription factor for heat shock proteins. The HSR plays a protective role by ensuring proper folding and distribution of proteins within cells. This pathway is induced by not only temperature stress, but also by a variety of other stressors such as hypoxic conditions and exposure to contaminants. HSF1 transactivates genes for many cytoprotective proteins involved in heat shock, DNA damage repair, and metabolism. This illustrates the versatile role of HSF1 in not only the heat shock response, but also in aging and diseases.