Key Product Details

Species Reactivity

Human, Mouse, Rat

Applications

ELISA, Immunocytochemistry/ Immunofluorescence, Western Blot

Label

Unconjugated

Antibody Source

Polyclonal Rabbit IgG

Format

BSA Free

Concentration

1 mg/ml

View all 2B4/CD244/SLAMF4 Antibodies »

Product Specifications

Immunogen

Antibody was raised against a 16 amino acid synthetic peptide near the carboxy terminus of human SLAMF4. The immunogen is located within the last 50 amino acids of SLAMF4. Amino Acid Squence: PKAQNPARLSRKELEN

Specificity

At least three isoforms of SLAMF4 are known to exist. SLAMF4 antibody is predicted to not cross-react with other SLAM protein family members.

Clonality

Polyclonal

Host

Rabbit

Isotype

IgG

Scientific Data Images for 2B4/CD244/SLAMF4 Antibody - BSA Free

Western Blot: 2B4/CD244/SLAMF4 AntibodyBSA Free [NBP1-76558]

Western Blot: 2B4/CD244/SLAMF4 AntibodyBSA Free [NBP1-76558]

Western Blot: 2B4/CD244/SLAMF4 Antibody [NBP1-76558] - Daudi cell lysate with CD244 antibody at (A) 1 and (B) 2 ug/mL.
Immunocytochemistry/ Immunofluorescence: 2B4/CD244/SLAMF4 Antibody - BSA Free [NBP1-76558]

Immunocytochemistry/ Immunofluorescence: 2B4/CD244/SLAMF4 Antibody - BSA Free [NBP1-76558]

Immunocytochemistry/Immunofluorescence: 2B4/CD244/SLAMF4 Antibody [NBP1-76558] - Immunofluorescence of SLAMF4 in Daudi cells with SLAMF4 antibody at 20 ug/mL.
2B4/CD244/SLAMF4 Antibody - BSA Free

Immunocytochemistry/ Immunofluorescence: 2B4/CD244/SLAMF4 Antibody - BSA Free [NBP1-76558] -

Immunocytochemistry/ Immunofluorescence: 2B4/CD244/SLAMF4 Antibody - BSA Free [NBP1-76558] - Immunofluorescence of 2B4/CD244/SLAMF4 in Daudi cells with 2B4/CD244/SLAMF4 antibody at 20 u/mL.
View 1 more images

Applications for 2B4/CD244/SLAMF4 Antibody - BSA Free

Application
Recommended Usage

ELISA

1:100-1:2000

Immunocytochemistry/ Immunofluorescence

20 ug/ml

Western Blot

1-2 ug/ml

Formulation, Preparation, and Storage

Purification

Peptide affinity purified

Formulation

PBS

Format

BSA Free

Preservative

0.02% Sodium Azide

Concentration

1 mg/ml

Shipping

The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.

Background: 2B4/CD244/SLAMF4

2B4, also known as CD244 and SLAMF4, is a type I transmembrane glycoprotein that is member of the signaling lymphocyte activation molecule (SLAM) subfamily in immunoglobulin (Ig) superfamily (1,2). The 2B4 protein plays a role in immune system associated diseases including the recognition and clearance of cancer cells, infected cells, and key allergy cells (1). 2B4 is expressed as a heterophilic receptor on the cell membrane of natural killer (NK) cells in addition to on monocytes and basophils, gamma/delta T cells, a subset of CD8+ T cells, and other immune cells and tissues (1). Additionally, 2B4 is considered a marker for CD8+ T cell exhaustion in chronic infection and increased expression has been observed in diseases including lymphocytic choriomeningitis virus (LCMV) and hepatitis B virus (HBV) (2). Human 2B4 protein is 370 amino acids (aa) in length with a theoretical molecular weight (MW) of 41 kDa (3). However, 2B4 contains multiple glycosylation sites that increases its observed MW to ~70 kDa (3). The 2B4/CD244 protein consists of a 21 aa signal peptide followed by an extracellular domain (ECD) with two Ig-like domains, a single transmembrane domain, and four cytoplasmic immunoreceptor tyrosine-based switch motifs (ITSMs) (3).

The 2B4 receptor has both activating and inhibitory signaling properties (1,4). 2B4's ligand is CD48, which is expressed on hematopoietic cells (4, 5). When bound to CD48, subsequent phosphorylation of the ITSMs occurs, followed by recruitment of SH-2-containing adaptor protein (SAP) and Fyn, leading to phosphorylation of PLCgamma and Vav1, and resulting in NK cell activation (4). In the absence of SAP, Src homology region 2-containing protein tyrosine phosphatases (SHP) get recruited and inhibits NK cell activation (4). In the context of infection such as Epstein-Barr virus (EBV), when lacking SAP, 2B4 has been shown to have an inhibitory function via impaired T cell cytotoxicity against EBV-infected cells (6). While 2B4 has a role in eliciting CD8+ T cell response, overexpression of 2B4 can lead to T cell exhaustion in states of chronic infection (6). Studies have suggested that the antibody blockade of the 2B4-CD48 interaction might enhance T cell and NK cell function, however given both the activating and inhibitory properties of the 2B4 receptor, more research needs to be done to prevent unwanted effects (6).

References

1. Buller CW, Mathew PA, Mathew SO. Roles of NK Cell Receptors 2B4 (CD244), CS1 (CD319), and LLT1 (CLEC2D) in Cancer. Cancers (Basel). 2020 Jul 1;12(7):1755. https://doi.org/10.3390/cancers12071755

2. Catakovic K, Klieser E, Neureiter D, Geisberger R. T cell exhaustion: from pathophysiological basics to tumor immunotherapy. Cell Commun Signal. 2017;15(1):1. https://doi.org/10.1186/s12964-016-0160-z

3. Uniprot (Q9BZW8)

4. Chen Y, Lu D, Churov A, Fu R. Research Progress on NK Cell Receptors and Their Signaling Pathways. Mediators Inflamm. 2020 Jul 24;2020:6437057. https://doi.org/10.1155/2020/6437057.

5. Pahima H, Puzzovio PG, Levi-Schaffer F. 2B4 and CD48: A powerful couple of the immune system. Clin Immunol. 2019 Jul;204:64-68. https://doi.org/10.1016/j.clim.2018.10.014.

6. Waggoner SN, Kumar V. Evolving role of 2B4/CD244 in T and NK cell responses during virus infection. Front Immunol. 2012;3:377. https://doi.org/10.3389/fimmu.2012.00377

Alternate Names

CD244, NAIL, NKR2B4, Nmrk, SLAMF4

Gene Symbol

CD244

Additional 2B4/CD244/SLAMF4 Products

Product Documents for 2B4/CD244/SLAMF4 Antibody - BSA Free

Product Datasheets

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

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Product Specific Notices for 2B4/CD244/SLAMF4 Antibody - BSA Free

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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