H1830-53G

Heat Shock Protein 25/27 (HSP27, Heat Shock Protein beta-1, HspB1, Heat Shock 27kD Protein, Stress-responsive Protein 27, SRP27, Estrogen-regulated 24kD Protein, 28kD Heat Shock Protein)

Size

£515.00

SKU:: H1830-53G
Purity:: Purified by Protein G affinity chromatography.
Storage Conditions:: -20°C
Supplier:: United States Biological
Host:: Mouse
Immunogen:: Synthetic peptide corresponding to human Hsp 25/27.
Clone:: 8A7
Format:: Supplied as a liquid in PBS, 0.09% sodium azide, 50% glycerol.
Extra Details:: Hsp25 is the mouse homologue of the human Hsp27 protein, a member of the small heat shock protein family comprised of a diverse group of proteins from ~15 to>30kD (1). The basic structure of most sHsps is a homologous and highly conserved amino acid sequence, with an a-crystallin-domain at the C-terminus and the WD/EPF domain at the less conserved N-terminus. This N-terminus is essential for the development of high molecular oligomers (2, 3). Hsp27-oligomers consist of stable dimers formed by as many as 8-40 Hsp27 protein monomers (4). The oligomerization status is connected with the chaperone activity: aggregates of large oligomers have high chaperone activity, whereas dimers have no chaperone activity (5). HSP27 is localized to the cytoplasm of unstressed cells but can redistribute to the nucleus in response to stress, where it may function to stabilize DNA and/or the nuclear membrane. It can be rapidly phosphorylated in response to physiological stimuli relevant to the cell type examined. Thus, hsp27 has been suggested to be an important intermediate in second messenger-mediated signaling pathways (6). Other functions include chaperone activity (as mentioned above), thermo- tolerance in vivo, inhibition of apoptosis, and signal transduction. Specifically, in vitro, it acts as an ATP-independent chaperone by inhibiting protein aggregation and by stabilizing partially denatured proteins, which ensures refolding of the HSP70 complex. Hsp27 is also involved in the apoptotic signaling pathway because it interferes with the activation of cytochrome c/Apaf-1/dATP complex, thereby inhibiting the activation of procaspase- 9. It is also hypothesized that hsp27 may serve some role in cross-bridge formation between actin and myosin (7). And finally, Hsp27 is also thought to be involved in the process of cell differentiation. The up-regulation of Hsp27 correlates with the rate of phosphorylation and with an increase of large oligomers. It is possible that Hsp27 may play a crucial role in termination of growth (8). Applications: Suitable for use in Flow Cytometry, Immunofluorescence/Immunocytochemistry, Immunoprecipitation, Immunohistochemistry and Western Blot. Other applications not tested. Recommended Dilutions: Immunofluorescence (IC): 1:200 Western Blot: 1:5000 Immunohistochemistry: 1:100 Optimal dilutions to be determined by the researcher. Storage and Stability: May be stored at 4°C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

Shipping Conditions:: Blue Ice