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. [provided by RefSeq, Jul 2008]
Overall distribution
Tissue specific distribution
Overall distribution
Tissue specific distribution
Gscore (Amp):
0.14
Gscore (Del):
0.00
Recurrently amplified in 1 cancer type(s)
Overall distribution
Tissue specific distribution
Mscore:
0.00
Overall
Tissue specific
Total fusion occurrence:
3
Fusions detected in 3 cancer type(s)
Overall
Tissue specific
Functional class:
Not specified
JensenLab PubMed score:
1544.18 (Percentile rank: 97.15%)
PubTator score:
894.33 (Percentile rank: 96.06%)
Target development/druggability level:
TbioThese targets do not have known drug or small molecule activities that satisfy the activity thresholds detailed below AND satisfy one or more of the following criteria: 1) target is above the cutoff criteria for Tdark; 2) target is annotated with a Gene Ontology Molecular Function or Biological Process leaf term(s) with an Experimental Evidence code.
Tractability (small molecule):
N/A
Tractability (antibody):
Predicted Tractable - High confidenceTargets located in the plasma membrane; Targets with GO cell component terms plasma membrane or secreted
