Human CRTAM Antibody

  
  • Species Reactivity
    Human
  • Specificity
    Detects human CRTAM in ELISAs and Western blots. In sandwich immunoassays, less than 2% cross-reactivity with recombinant mouse CRTAM is observed.
  • Source
    Polyclonal Goat IgG
  • Purification
    Antigen Affinity-purified
  • Immunogen
    Mouse myeloma cell line NS0-derived recombinant human CRTAM
    Ser18-Ser286
    Accession # O95727
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Label
    Unconjugated
Applications
  •  
    Recommended
    Concentration
    Sample
  • Western Blot
    1 µg/mL
    See below
    • Human CRTAM Sandwich Immunoassay
      Reagent
  • ELISA Capture (Matched Antibody Pair)
    0.2-0.8 µg/mL 
    Human CRTAM Antibody (Catalog # AF1695)
  • ELISA Detection (Matched Antibody Pair)
    0.1-0.4 µg/mL 
    Human CRTAM Biotinylated Antibody (Catalog # BAF1695)
  • ELISA Standard
     
    Recombinant Human CRTAM Fc Chimera Protein, CF (Catalog # 1695-CR)
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Detection of Human CRTAM by Western Blot. Western blot shows lysates of human CD8+ T cells. PVDF membrane was probed with 1 µg/mL of Goat Anti-Human CRTAM Antigen Affinity-purified Polyclonal Antibody (Catalog # AF1695) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF017). A specific band was detected for CRTAM at approximately 85 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.2 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: CRTAM

CRTAM (Class I-restricted T cell-associated molecule) is a nectin family member of the immunoglobulin superfamily that is expressed by activated CD8+ and NK T cells (1‑4). NK activation receptor engagement, but not cytokines, also induce NK CRTAM expression (4, 5). CRTAM is found in spleen, thymus, small intestine, peripheral blood, and surprisingly, in brain where it is highly expressed by Purkinje cells of the cerebellum (1, 2). Human CRTAM is a 393 amino acid (aa), 80 kDa type I transmembrane glycoprotein with a 17 aa signal sequence, a 269 aa extracellular domain (ECD), a 21 aa transmembrane segment, and an 84 aa cytoplasmic domain. The ECD has one V-type and one C1-type Ig-like domain, while the cytoplasmic region shows a potential class I PDZ domain (1‑5). Human CRTAM ECD shows 70%, 43%, and 63% aa identity with mouse, rat, and canine CRTAM ECD, respectively, but 73‑78% aa identity within the Ig-like domains. The V-type Ig-like domain mediates interaction with the corresponding domain on another nectin family member, IGSF4 (also called TSLC-1, Necl-2, Syncam or SgIGSF) (4, 5). CRTAM is a homodimer on the cell surface but does not show homotypic binding in trans (3‑5). The high affinity of CRTAM/IGSF4 adhesion allows CRTAM to disrupt IGSF4 homotypic interactions (3‑5). IGSF4 and T cell receptor co-engagement of CRTAM-expressing CD8+ cells induces increased IFN-gamma or IL-22 production (3, 4). A role in cancer surveillance through NK cell-mediated rejection of IGSF4-expressing tumors has been proposed (3‑5). IGSF4 is expressed broadly, including on epithelia, neurons, a subset of tonsillar B cells (4, 5), and a rare splenic T zone-restricted BCDA3+ dendritic cell population which interacts with CRTAM (3).

  • References:
    1. Kennedy, J. et al. (2000) J. Leukoc. Biol. 67:725.
    2. Patino-Lopez, G. et al. (2006) J. Neuroimmunol. 171:145.
    3. Galibert, L. et al. (2005) J. Biol. Chem. 280:21955.
    4. Boles, K. S. et al. (2005) Blood 106:779.
    5. Arase, N. et al. (2005) Int. Immunol. 17:1227.
  • Long Name:
    Class I-restricted T-cell-associated Molecule, Nectin
  • Entrez Gene IDs:
    56253 (Human)
  • Alternate Names:
    CD355 antigen; CD355; class I MHC restricted T cell associated molecule; class-I MHC-restricted T cell associated molecule; Class-I MHC-restricted T-cell-associated molecule; CRTAM; cytotoxic and regulatory T cell molecule; cytotoxic and regulatory T-cell molecule
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