• Species Reactivity

  Human

• Specificity

  Detects human CD97 in direct ELISAs and Western blots. In direct ELISAs and Western blots, no cross‑reactivity with recombinant mouse CD97 is observed.

• Source

  Monoclonal Mouse IgG2a Clone # 380903

• Immunogen

  Mouse myeloma cell line NS0-derived recombinant human CD97    
  Gln21-Gln398    
  Accession # NP_001775.2

• Formulation

  Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.

• Label

  Alexa Fluor 350

Applications

• 
  

  Recommended    
  Concentration

  Sample

• Flow Cytometry

  0.25-1 µg/10    ⁶ cells

  Human whole blood

• 
  

Please Note: Optimal dilutions should be determined by each laboratory for each application.  are available in the Technical Information section on our website.

Preparation and Storage

• Shipping

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

• Stability & Storage

  Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: CD97

CD97 is a 95‑100 kDa member of a protein group known as the LNB-TM7 protein family that evolved from genes of the secretin receptor superfamily (1‑3). Molecules in this family are unique hybrid structures consisting of EGF-like modules coupled to class B G-protein 7-transmembrane (TM) domains by a glycosylated (mucin) stalk. Human CD97 is synthesized as an 835 amino acid (aa) precursor that contains a 20 aa signal sequence, a 532 aa extracellular domain (ECD), a 238 aa “transmembrane” region that includes seven TM segments, and a 45 aa cytoplasmic tail (4). Within the 532 aa ECD, the first 236 aa contains five EGF-like domains, the C-terminal four of which bind calcium, and a juxtamembrane 296 aa RGD-containing mucin stalk (4, 5). The stalk is both glycosylated and proteolytically cleaved (at aa 530) to create a noncovalently linked 65‑70 kDa glycosylated extracellular alpha -subunit and a 28 kDa 7-TM membrane-bound beta -subunit (4). There are two known alternate splice forms in human. Isoform # 1 contains four EGF-like domains (domain # 1, 2, 3 and 5), while isoform # 2 contains three EGF-like domains (domain # 1, 2 and 5) (1, 4, 6). The ECD in isoform 1 is 60 kDa in size, while the ECD in isoform 2 is 55 kDa in size (native molecular weight). The five EGF-like domain region in human is 55% aa identical to that in mouse. Cells known to express CD97 include monocytes, macrophages, T cells, select B cells, dendritic cells and, potentially, vascular and visceral smooth muscle cells (1, 7). There are at least two ligands for CD97. One is chrondroitin sulfate that binds only to the full-length (five domain) form of CD97. Binding is dependent on the presence of EGF-like domain # 4 (3). The second ligand for CD97 is CD55, a GPI-linked cell surface molecule with short consensus repeats that regulates complement activation on cell surfaces (1, 5, 7). CD97 EGF-like domains # 1 and 2 bind CD55 while domain # 5 stabilizes the CD97 molecule. The shortest CD97 isoform shows the strongest binding to CD55 (7, 8).

• References:

1. McKnight, A.J. and S. Gordon (1998) J. Leukoc. Biol. 63:271.

2. Stacey, M. et al. (2000) Trends Biochem. Sci. 25:284. 

3. Stacey, M. et al. (2003) Blood 102:2916. 

4. Gray, J.X. et al. (1996) J. Immunol. 157:5438. 

5. Lin, H-H. et al. (2001) J. Biol. Chem. 276:24160.

6. Hamann, J. et al. (1995) J. Immunol. 155:1942.

7. Jaspars, L.H. et al. (2001) Tissue Antigens 57:325.

8. Hamann, J. et al. (1996) J. Exp. Med. 184:1185.

• Entrez Gene IDs:

  976 (Human); 26364 (Mouse)

• Alternate Names:

  CD97