Heat Shock Factor 1, phosphorylated (Ser303/307) (Heat Shock Transcription Factor 1, HSF1, HSTF1)

Human cells respond to heat stress by inducing the binding of a pre-existing transcriptional activator (heat shock factor, HSF) to DNA (1). Induction of heat shock protein (HSP) gene expression by stress is initiated by binding of HSF1 to HSP gene promoters to increase their transcription. The cytoprotective functions of these HSPs are essential for cell survival, and thus it is critical that inducible HSP gene expression be executed rapidly and efficiently. There is an interaction between heat shock factor 1 (HSF1) and symplekin, a protein known to form a complex with the polyadenylation factors CstF and CPSF. HSF1-symplekin complexes are detected only after stress treatment, and these two proteins co-localize in punctate nuclear structures in stressed cells (2). A chaperone/Hsp functioning as repressor of heat shock transcription factor (HSF) could make activation of hsp genes dependent on protein unfolding. It has been concluded that Hsp90, by itself and/or associated with multichaperone complexes, is a major repressor of HSF1 (3).\n\nApplications:\nSuitable for use in Western Blot, Immunohistochemistry and Immunocytochemistry. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 1:5000-1:50,000\nImmunohistochemistry: 1:100-1:250\nImmunocytochemistry: 1:250-1:500\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. For long-term storage, aliquot and store at -20 degrees C. Aliquots are stable for at least 12 months at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.\n\nManufactured incorporating RabMAb(R) technology under Epitomics US patents, No 5,675,063 and 7,429,487, owned by Abcam.

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SPECIFICATIONS

Catalog Number

H1830-44G

Size

100ul

Applications

ICC, IHC, WB

Hosts

Rabbit

Reactivities

Hum

Form

Supplied as a liquid in 50mM Tris-glycine, pH 7.4, 0.15M sodium chloride, 40% glycerol, 0.01% sodium azide, 0.05% BSA.

P Type

Mab

Purity

Supernatant.

Isotype

IgG

References

1. Rabindran Sk, et al. Proc Natl Acad 88(16):6906-10, 1991 2. Xing H, et al. J Biol Chem 279(11):10551-5, 2004 3. Zou J, et al. Cell 94(4):471-80, 1998 4. Chu B, et al. JBC 273:18640-18646, 1998

Additional Info

Recognizes human HSF1 when phosphorylated at Ser303/307.