CALR Antilichaam / Calreticuline

Calreticulin, also known as calregulin, CRP55, CaBP3, calsequestrin-like protein, and endoplasmic reticulum resident protein 60 (ERp60) is a protein that in humans is encoded by the CALR gene. It is mapped to 19p13.13. 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.

Western blot: 1-2 µg/mL, Immunohistochemistry (FFPE) : 2-5 µg/mL, Flow cytometry: 1-3ug/million cells, ELISA: 0.1-0.5 µg/mL

P27797

Human, Mouse, Rat

An E.coli-derived human recombinant protein (amino acids T333-Q365) was used as the immunogen for the CALR antibody.

WB, IHC-P, FACS, ELISA

Antigen affinity chromatography

Antigen affinity purified

Lyophilized from 1X PBS with 2% Trehalose

This CALR antibody is available for research use only.

After reconstitution, the CALR antibody can be stored for up to one month at 4°C. For long-term, aliquot and store at -20°C. Avoid repeated freezing and thawing.

0.5 mg/mL if reconstituted with 0.2ml sterile DI water

Optimal dilution of the CALR antibody should be determined by the researcher.

Cytoplasm, cell membrane

Western blot testing of 1) rat brain, 2) rat skeletal muscle, 3) rat liver, 4) rat C6, 5) mouse brain, 6) mouse skeletal muscle, 7) mouse liver and 8) mouse NIH 3T3 cell lysate with CALR antibody. Predicted molecular weight ~48 kDa but routinely observed at 55~60 kDa.