CALR Antibody

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.

811

P27797

P27797

Human, Rat

This CALR Antibody is generated from rabbits immunized with a recombinant protein of human CALR.

Unconjugated

Primary Antibodies

Signal Transduction

This antibody is purified through a protein A column, followed by peptide affinity purification.

Batch dependent

Supplied in PBS with 0.09% (W/V) sodium azide.

None

Blue Ice

Store at 4˚ C for three months and -20˚ C, stable for up to one year. As with all antibodies care should be taken to avoid repeated freeze thaw cycles. Antibodies should not be exposed to prolonged high temperatures.

48 kDa

Rabbit Ig

CALR

Calreticulin

Homo sapiens

Du, X.L., et al. Oncogene 28 (42) :3714-3722 (2009)

Sato, H., et al. Biochim. Biophys. Acta 1790 (10) :1198-1205 (2009)

Abd Alla, J., et al. Biochem. Biophys. Res. Commun. 387 (1) :186-190 (2009)

Calreticulin, CRP55, Calregulin, Endoplasmic reticulum resident protein 60, ERp60, HACBP, grp60, CALR, CRTC

WB, IHC-P, Flow

117501