Heat Shock Protein 70 (HSP70, Hsp70 1, Hsp70 2, Hsp70.1, Hsp72, Hsp73, HSPA1, HSPA1A, HSPA1B)

Hsp70 genes encode abundant heat-inducible 70kD hsps (hsp70s). In most eukaryotes hsp70 genes exist as part of a multigene family. They are found in most cellular compartments of eukaryotes including nuclei, mitochondria, chloroplasts, the endoplasmic reticulum and the cytosol, as well as in bacteria. The genes show a high degree of conservation, having at least 5O% identity (1, 2). The N-terminal two thirds of hsp70s are more conserved than the C-terminal third. Hsp70 binds ATP with high affinity and possesses a weak ATPase activity which can be stimulated by binding to unfolded proteins and synthetic peptides (3). When hsc70 (constitutively expressed) present in mammalian cells was truncated, ATP binding activity was found to reside in an N-terminal fragment of 44kD which lacked peptide binding capacity. Polypeptide binding ability therefore resided within the C-terminal half (4). The structure of this ATPbinding domain displays multiple features of nucleotide binding proteins (5). All hsp70s, regardless of location, bind proteins, particularly unfolded ones. The molecular chaperones of the hsp70 family recognize and bind to nascent polypeptide chains as well as partially folded intermediates of proteins preventing their aggregation and misfolding. The binding of ATP triggers a critical conformational change leading to the release of the bound substrate protein (6). The universal ability of hsp70s to undergo cycles of binding to and release from hydrophobic stretches of partially unfolded proteins determines their role in a great variety of vital intracellular functions such as protein synthesis, protein folding and oligomerization and protein transport.\n\nApplications: \nSuitable for use in ELISA, Western Blot, Immunoprecipitation, Immunohistochemistry and Immunocytochemistry. Other applications not tested.\n\nRecommended Dilution:\nWestern Blot: 1:25,000\nImmunoprecipitation: 1:100\nOptimal dilutions to be determined by the researcher.\n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for at least 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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SPECIFICATIONS

Catalog Number

136786

Size

25ul

Applications

ELISA, ICC, IHC, IP, WB

Hosts

Rabbit

Reactivities

Hum, Mouse, Rat, Bov, Can, GP, Prc, Sheep

Form

Supplied as a liquid.

P Type

Pab

Purity

Supernatant.

References

1. Welch W.J. and Suhan J.P. (1986) J.Cell Biol. 103: 2035-2050. 2. Boorstein W. R., Ziegelhoffer T. & Craig E. A. (1993) J. Mol. Evol. 38(1): 1-17. 3. Rothman J. (1989) Cell 59: 591 -601. 4. DeLuca-Flaherty et al. (1990) Cell 62: 875-887. 5. Bork P., Sander C. & Valencia A. (1992) Proc. Nut1 Acad. Sci. USA 89: 7290-7294. 6. Fink A.L. (1999) Physiol. Rev. 79: 425-449. 7. Hung T.H., et al. (2001) Am J Pathol. 159: 1031-1043. 8. Locke M. (2000) Cell Stress & Chaperones 5: 45-51. 9. Ianaro A., et al. (2001) FEBS Lett. 508: 61-66. 10.Trentin G.A. et al. (2001) J Biol Chem. 276: 13087- 13095.

Additional Info

Recognizes human Hsp70 at ~70kD. Species Crossreactivity: Mouse, rat, beluga, bovine, canine, fish(carp), guinea pig, hamster, monkey, porcine, sheep, coral, tomato, tobacco, spiny dogfish shark (Squalus acanthias), atlantic hagfish (Myxine glutinosa), rainbow trout. May cross-react with Hsc70 at lower dilutions.

Alternative Names

HSP70, Hsp70 1, Hsp70 2, Hsp70.1, Hsp72, Hsp73, HSPA1, HSPA1A, HSPA1B