Recombinant Human CALR protein, His-tagged

• Cat.No.: CALR-524H

Specification

• Product overview: Recombinant Human CALR (P27797) fused with His tag was produced in HEK293F cells.
• 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.
• Source: HEK293F
• Species: Human
• Tag: His
• Form: Freeze-dried powder
• Endotoxin: <1.0EU per 1ug (determined by the LAL method)
• Purity: > 97%
• Applications: Positive Control; Immunogen; SDS-PAGE; WB.
  If bio-activity of the protein is needed, please check active protein.
• Stability: The thermal stability is described by the loss rate. The loss rate was determined by accelerated thermal degradation test, that is, incubate the protein at 37°C for 48h, and no obvious degradation and precipitation were observed. The loss rate is less than 5% within the expiration date under appropriate storage condition.
• Storage: Avoid repeated freeze/thaw cycles. Store at 2-8°C for one month. Aliquot and store at -80°C for 12 months.
• Storage buffer: PBS, pH7.4, containing 0.01% SKL, 1mM DTT, 5% Trehalose and Proclin300.
• Reconstitution: Reconstitute in PBS or others.

Gene Information

• Gene Name: CALR calreticulin [ Homo sapiens (human) ]
• Official Symbol: CALR
• Synonyms: CALR; calreticulin; RO; CRT; SSA; cC1qR; HEL-S-99n; CRP55; ERp60; HACBP; Sicca syndrome antigen A (autoantigen Ro; calreticulin); calregulin; endoplasmic reticulum resident protein 60; epididymis secretory sperm binding protein Li 99n; grp60
• Gene ID: 811
• mRNA Refseq: NM_004343.3
• Protein Refseq: NP_004334.1
• UniProt ID: P27797