Cell Signaling Technology

Product Pathways - Protein Folding

HSP90 (C45G5) Rabbit mAb #4877

Applications Reactivity Sensitivity MW (kDa) Isotype
W IHC-P IF-IC F H M R Mk (B) Endogenous 90 Rabbit IgG

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

Protocols

Specificity / Sensitivity

HSP90 (C45G5) Rabbit mAb detects endogenous levels of total HSP90 protein. This antibody does not cross-react with other HSPs.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide surrounding Asn300 of human HSP90.

Western Blotting

Western Blotting

Western blot analysis of extracts from HeLa, NIH/3T3, PC12 and COS cells using HSP90 (C45G5) Rabbit mAb.

IHC-P (paraffin)

IHC-P (paraffin)

Immunohistochemical analysis of paraffin-embedded human colon using HSP90 (C45G5) Rabbit mAb.

IHC-P (paraffin)

IHC-P (paraffin)

Immunohistochemical analysis of paraffin-embedded human colon carcinoma using HSP90 (C45G5) Rabbit mAb.


Flow Cytometry

Flow Cytometry

Flow cytometric analysis of HeLa cells using HSP90 (C45G5) Rabbit mAb (blue) compared to a nonspecific negative control antibody (red).

IF-IC

IF-IC

Confocal immunofluorescent analysis of HeLa cells using HSP90 (C45G5) Rabbit mAb (green). Actin filaments have been labeled with DY-554 phalloidin (red).

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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Companion Products

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

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