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Description for Protein CALR

calreticulin
39 total interacting proteins; 26 platelet interacting proteins
Icon Book Platelet Evidence (proteome studies/others : 10/0)
(membrane: 2; platelet: 9; secretome: 1)
Summary:
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] (PubMed Links)
Domains and Motifs:
  • SP: Signal Peptide
  • CC: Coiled Coil
    • Gene Ontology:
    Gene Ontology Annotations
    KEGG - Enzyme ID(s):
    None Available
    KEGG - Orthology:
    K08057
    KEGG - Pathway(s):
    hsa04612; hsa05142
    (The yellow boxes represents platelet proteins)
    Nomenclature / Alternative Names:
    Autoantigen Ro; RO; CRP55; Calregulin; HACBP; Sicca syndrome antigen A; ERp60; CRTC
    Approved Symbol:
    CALR
    (De-) Phosphorylations:
    Total (de-) phosphorylation sites: 0
    No human (de-) phosphorylation sites; No platelet phosphorylation sites
    Phosphorylation Targets:
    Total phosphorylation targets: 0
    Human phosphorylation targets: 0;Predicted platelet targets: 0
    		Protein Characteristics:
    Isoform-specific Information
    Icon DrugsAssociated Drugs (DrugBank Accession):

  • Antihemophilic Factor(db);
  • Melatonin(db);
  • Tenecteplase(db)

    Associated Genetic Diseases:

    None Available
    		• Predicted Transmembrane Domains:
  • Isoform 1 : 0
    • Additional Identifiers:

    HPRD: 00169 Entrez Gene ID: 811 OMIM ID: 109091 Swissprot Accession: P27797;