Calreticuline Antilichaam [1G6A7]

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

Synthetic peptide of human Calreticulin.

1G6A7

Unconjugated

Primary Antibodies

Other

Batch dependent

Ascitic fluid containing 0.03% sodium azide.

None

Blue Ice

Calreticulin monoclonal antibody can be stored at -20˚ C, stable for 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.

IgG2a

CALR

Calreticulin

Homo sapiens

J Biol Chem. 2006 May 5;281 (18) :12841-8. Epub 2006 Mar 9.

Biochim Biophys Acta. 2006 May;1760 (5) :745-53. Epub 2006 Feb 28.

CRTC, CRP55, ERp60, RO, CRT, SSA, cC1qR, HEL-S-99n

ELISA, WB

117501