Hsp90 Alpha StressXpress® Human ELISA

Cat. No.	Size	Price
RSKT-107-480R	5x 96 wells (1 kit)

Technical Data

Type

Sandwich ELISA, Biotin-labelled antibody

Applications

Serum, Tissue extract, Cell lysate

Storage/Expiration

2–8°C

Calibration Curve

Calibration Range

28–0.44 ng/mL

Summary

Features

ELISA Kit is for the detection of human Hsp90α in cell lysates, tissue extracts, and serum samples
The total assay time is less than 4 hours

Research topic

Apoptosis, Oncology, Others

Summary

Hsp90 is a highly conserved and essential stress protein that is expressed in all eukaryotic cells. From a functional perspective, hsp90 participates in the folding, assembly, maturation, and stabilization of specific proteins as an integral component of a chaperone complex (1-4). Despite its label of being a heat-shock protein, hsp90 is one of the most highly expressed proteins in unstressed cells (1–2% of cytosolic protein). It carries out a number of housekeeping functions – including controlling the activity, turnover, and trafficking of a variety of proteins. Most of the hsp90- regulated proteins that have been discovered to date are involved in cell signaling (5-6). The number of proteins now known to interact with Hsp90 is about 100. Target proteins include the kinases v-Src, Wee1, and c-Raf, transcriptional regulators such as p53 and steroid receptors, and the polymerases of the hepatitis B virus and telomerase(3). When bound to ATP, Hsp90 interacts with co-chaperones Cdc37, p23, and an assortment of immunophilin-like proteins, forming a complex that stabilizes and protects target proteins from proteasomal degradation.
In most cases, hsp90-interacting proteins have been shown to co-precipitate with hsp90 when carrying out immune-oadsorption studies, and to exist in cytosolic heterocomplexes with it. In a number of cases, variations in hsp90 expression or hsp90 mutation has been shown to degrade signaling function via the protein or to impair a specific function of the protein (such as steroid binding, kinase activity) in vivo. Ansamycin antibiotics, such as geldanamycin and radicicol, inhibit hsp90 function (7).

References to Product

References

Arlander S.J.H., et al. (2003) J Biol Chem 278: 52572-52577.
Neckers L, et al. (2002) Trends Mol Med 8:S55-S61.
Pearl H., et al. (2001) Adv Protein Chem 59: 157-186.
Pratt W., Toft D. (2003) Exp Biol Med 228:111-133.
Pratt W., Toft D. (1997) Endocr Rev 18: 306–360.
Pratt W.B. (1998) Proc Soc Exptl Biol Med 217: 420–434.
Whitesell L., et al. (1994) Proc Natl Acad Sci USA 91: 8324– 8328.

References to Summary

References to Heat Shock 90kDa Protein Alpha

Arlander SJ, Eapen AK, Vroman BT, McDonald RJ, Toft DO, Karnitz LM. Hsp90 inhibition depletes Chk1 and sensitizes tumor cells to replication stress. J Biol Chem. 2003 Dec 26;278 (52):52572-7
Neckers L. Hsp90 inhibitors as novel cancer chemotherapeutic agents. Trends Mol Med. 2002;8 (4 Suppl):S55-61
Pearl LH, Prodromou C. Structure, function, and mechanism of the Hsp90 molecular chaperone. Adv Protein Chem. 2001;59:157-86
Pratt WB. The hsp90-based chaperone system: involvement in signal transduction from a variety of hormone and growth factor receptors. Proc Soc Exp Biol Med. 1998 Apr;217 (4):420-34
Pratt WB, Toft DO. Regulation of signaling protein function and trafficking by the hsp90/hsp70-based chaperone machinery. Exp Biol Med (Maywood). 2003 Feb;228 (2):111-33
Pratt WB, Toft DO. Steroid receptor interactions with heat shock protein and immunophilin chaperones. Endocr Rev. 1997 Jun;18 (3):306-60
Whitesell L, Mimnaugh EG, De Costa B, Myers CE, Neckers LM. Inhibition of heat shock protein HSP90-pp60v-src heteroprotein complex formation by benzoquinone ansamycins: essential role for stress proteins in oncogenic transformation. Proc Natl Acad Sci U S A. 1994 Aug 30;91 (18):8324-8

Documents

Product Datasheet (RUO)

Datasheet PDF (RUO)