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Home >> Antibodies >> Calreticulin Antibody / CALR

Calreticulin Antibody / CALR (F54897)

  Catalog No Formulation Size Price (USD)  
Image F54897-0.4ML In 1X PBS, pH 7.4, with 0.09% sodium azide 0.4 ml 399
Image
F54897-0.08ML In 1X PBS, pH 7.4, with 0.09% sodium azide 0.08 ml 185
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IHC testing of FFPE human colon carcinoma tissue with Calreticulin antibody. HIER: steam section in pH6 citrate buffer for 20 min and allow to cool prior to staining.
Western blot testing of 1) human HeLa, 2) human SH-SY5Y and 3) rat C6 cell lysate with Calreticulin antibody. Predicted molecular weight ~48 kDa but routinely observed at 55~60 kDa.
Flow cytometry testing of human HepG2 cells with Calreticulin antibody; Blue=isotype control, Green= Calreticulin antibody.
Availability 1-3 business days
Species Reactivity Human, Rat
Format Purified
Clonality Polyclonal (rabbit origin)
Isotype Rabbit Ig
Purity Antigen affinity purified
UniProt P27797
Localization Cytoplasmic
Applications Western blot : 1:500-1:1000
Flow cytometry : 1:10-1:50 (1x10e6 cells)
Immunohistochemistry (FFPE) : 1:10-1:50
Limitations This Calreticulin antibody is available for research use only.
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Description

Calreticulin is a multifunctional protein that acts as a major Ca(2+)-binding (storage) protein in the lumen of the endoplasmic reticulum. It is also found in the nucleus, suggesting that it may have a role in transcription regulation. Calreticulin binds to the synthetic peptide KLGFFKR, which is almost identical to an amino acid sequence in the DNA-binding domain of the superfamily of nuclear receptors. Calreticulin binds to antibodies in certain sera of systemic lupus and Sjogren patients which contain anti-Ro/SSA antibodies, it is highly conserved among species, and it is located in the endoplasmic and sarcoplasmic reticulum where it may bind calcium. The amino terminus of calreticulin interacts with the DNA-binding domain of the glucocorticoid receptor and prevents the receptor from binding to its specific glucocorticoid response element. Calreticulin can inhibit the binding of androgen receptor to its hormone-responsive DNA element and can inhibit androgen receptor and retinoic acid receptor transcriptional activities in vivo, as well as retinoic acid-induced neuronal differentiation. Thus, calreticulin can act as an important modulator of the regulation of gene transcription by nuclear hormone receptors. Systemic lupus erythematosus is associated with increased autoantibody titers against calreticulin but calreticulin is not a Ro/SS-A antigen. Earlier papers referred to calreticulin as an Ro/SS-A antigen but this was later disproven. Increased autoantibody titer against human calreticulin is found in infants with complete congenital heart block of both the IgG and IgM classes.

Application Notes

The stated application concentrations are suggested starting points. Titration of the Calreticulin antibody may be required due to differences in protocols and secondary/substrate sensitivity.

Immunogen

Recombinant human protein was used as the immunogen for the Calreticulin antibody.

Storage

Aliquot the Calreticulin antibody and store frozen at -20oC or colder. Avoid repeated freeze-thaw cycles.

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