Cell Signaling Technology

Product Pathways - Protein Folding

HSP70 (D69) Antibody (Alexa Fluor® 488 Conjugate) #4837

Applications Reactivity Sensitivity Source
F H M R Mk Endogenous Rabbit

Applications Key:  F=Flow Cytometry
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

HSP70 (D69) Antibody (Alexa Fluor® 488 Conjugate) detects endogenous levels of total HSP70 protein. This antibody does not cross-react with other HSPs.  

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues around Asp69 of human HSP70. Antibodies are purified by protein A and peptide affinity chromatography. This antibody was conjugated to Alexa Fluor® 488 under optimal conditions with an F/P ratio of 2-6.

Flow Cytometry

Flow Cytometry

Flow cytometric analysis of HeLa cells using HSP70 (D69) Antibody (Alexa Fluor® 488 Conjugate) (green) compared to XP® Rabbit (DA1E) mAb IgG Isotype Control (Alexa Fluor® 488 Conjugate) #2975 (red).

Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 488 fluorescent dye and tested in-house for direct flow cytometric analysis of human cells. The unconjugated HSP70 (D69) Antibody #4876 reacts with human, mouse, rat and monkey HSP70 protein. CST expects that HSP70 (D69) Rabbit Antibody (Alexa Fluor® 488 Conjugate) will also recognize HSP70 in these species.

Background

HSP70 and HSP90 are molecular chaperones expressed constitutively under normal conditions to maintain protein homeostasis and are induced upon environmental stress (1). Both HSP70 and HSP90 are able to interact with unfolded proteins to prevent irreversible aggregation and catalyze the refolding of their substrates in an ATP- and co-chaperone-dependent manner (1). HSP70 has a broad range of substrates including newly synthesized and denatured proteins, while HSP90 tends to have a more limited subset of substrates, most of which are signaling molecules. HSP70 and HSP90 often function collaboratively in a multi-chaperone system, which requires a minimal set of co-chaperones: HSP40, Hop, and p23 (2,3). The co-chaperones either regulate the intrinsic ATPase activity of the chaperones or recruit chaperones to specific substrates or subcellular compartments (1,4). When the ubiquitin ligase CHIP associates with the HSP70/HSP90 complex as a cofactor, the unfolded substrates are subjected to degradation by the proteasome (4). The biological functions of HSP70/HSP90 extend beyond their chaperone activity. They are essential for the maturation and inactivation of nuclear hormones and other signaling molecules (1,3). They also play a role in vesicle formation and protein trafficking (2).

  1. Nollen, E.A. and Morimoto, R.I. (2002) J. Cell Sci. 115, 2809-2816.
  2. Young, J.C. et al. (2003) Trends Biochem. Sci. 28, 541-547.
  3. Pratt, W.B. and Toft, D.O. (2003) Exp. Biol. Med. 228, 111-133.
  4. Hohfeld, J. et al. (2001) EMBO Rep. 2, 885-890.

Application References

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Alexa Fluor® is a registered trademark of Molecular Probes, Inc.

For Research Use Only. Not For Use In Diagnostic Procedures.

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