Product Pathways - MAPK Signaling

Phospho-HSP27 (Ser82) Antibody #2401

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Applications	Reactivity	MW (kDa)	Source
W IHC-P IHC-F IF-IC	H Mk	27	Rabbit

Applications Key:  W=Western Blotting  IHC-P=Immunohistochemistry (Paraffin)  IHC-F=Immunohistochemistry (Frozen)  IF-IC=Immunofluorescence (Immunocytochemistry)
Reactivity Key:  H=Human  Mk=Monkey
Species enclosed in parentheses are predicted to react based on 100% sequence homology. Species cross-reactivity is determined by Western blot.

Specificity / Sensitivity

Phospho-HSP27 (Ser82) Antibody detects endogenous HSP27 only when phosphorylated at serine 82. The antibody does not recognize other heat shock proteins.

Source / Purification

Polyclonal antibodies are produced by immunizing rabbits with a synthetic phospho- peptide (KLH coupled) corresponding to residues surrounding Ser82 of human HSP27. Antibodies are purified by protein A and peptide affinity chromatography.

Background

Heat shock protein (HSP) 27 is one of the small HSPs that are constitutively expressed at different levels in various cell types and tissues. Like other small heat shock proteins, HSP27 is regulated at both the transcriptional and posttranslational levels (1). In response to stress, the expression level of HSP27 increases several-fold to confer cellular resistance to the adverse environmental change. HSP27 is phosphorylated at Ser15, Ser78 and Ser82 by MAPKAP kinase 2 as a result of the activation of the p38 MAP kinase pathway (2,3). Phosphorylation of HSP27 causes a change in its tertiary structure, which shifts from large homotypic multimers to dimers and monomers (4). It has been shown that phosphorylation and increased concentration of HSP27 modulates actin polymerization and reorganization (5,6).

1. Arrigo, A.P. and Landry, J. (1994) Cold Spring Harbor Laboratory Press, NY, 335-373.
2. Landry, J. et al. (1992) J. Biol. Chem. 267, 794-803.
3. Rouse, J. et al. (1994) Cell 78, 1027-1037.
4. Rogalla, T. et al. (1999) J. Biol. Chem. 274, 18947-18956.
5. Lavoie, J. et al. (1993) J. Biol. Chem. 268, 24210-24214.
6. Rousseau, S. et al. (1997) Oncogene 15, 2169-2177.

Application References

• Sarkar, D. et al. (2002) mda-7 (IL-24) mediates selective apoptosis in human melanoma cells by inducing the coordinated overexpression of the GADD family of genes by means of p38 MAPK. Proc. Natl. Acad. Sci. USA 99, 10054-10059. This article references the use of Phospho-HSP27 (Ser82) Antibody in the following applications: Western Blotting
• Hofmann, M. et al. (2004) Mechanical pressure-induced phosphorylation of p38 mitogen-activated protein kinase in epithelial cells via Src and protein kinase C. Biochemical and Biophysical Research Communications 316, 673-679. This article references the use of Phospho-HSP27 (Ser82) Antibody in the following applications: IC-IF Western Blotting
• Kennett, S. B. et al. (2004) Requirement of protein kinase C micro activation and calpain-mediated proteolysis for arachidonic acid-stimulated adhesion of MDA-MB-435 human mammary carcinoma cells to collagen type IV. J. Biol. Chem. 279, 3300-3307. This article references the use of Phospho-HSP27 (Ser82) Antibody in the following applications: Western Blotting

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