Recombinant Human NCAM-1/CD56 Protein, CF

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2408-NC-050
R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human NCAM-1/CD56 Protein, CF Summary

Product Specifications

Purity
>90%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Activity
Measured by the ability of the immobilized protein to support the adhesion of Neuro‑2A mouse neuroblastoma cells.

When 5 x 104 cells/well are added to recombinant human NCAM-1 coated plates, cell adhesion is enhanced in a dose dependent manner after 1 hour incubation at 37 °C.  The ED50 for this effect is 0.5-3 μg/mL. 

Optimal dilutions should be determined by each laboratory for each application.

Source
Mouse myeloma cell line, NS0-derived human NCAM-1/CD56 protein
Human NCAM-1
(Leu20-Pro603)
Accession # NP_001070150
R Human NCAM-1
(Glu636-Asn741)
Accession # NP_001070150
N-terminus C-terminus
Accession #
N-terminal Sequence
Analysis
Leu20
Predicted Molecular Mass
76.5 kDa
SDS-PAGE
105 kDa, reducing conditions

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2408-NC

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

2408-NC

Formulation Lyophilized from a 0.2 μm filtered solution in Tris and NaCl.
Reconstitution Reconstitute at 100 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
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.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.
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Background: NCAM-1/CD56

Neural cell adhesion molecule 1 (NCAM-1) is a multifunctional member of the Ig superfamily. It belongs to a family of membrane-bound glycoproteins that are involved in Ca++ independent cell matrix and homophilic or heterophilic cell-cell interactions. NCAM-1 specifically binds to heparan sulfate proteoglycans (1), the extracellular matrix protein agrin (2), and several chondroitin sulfate proteoglycans that include neurocan and phosphocan (3). There are three main forms of human NCAM-1 that arise by alternate splicing. These are designated NCAM-120/NCAM-1 (761 amino acids [aa]), NCAM‑140 (848 aa), and NCAM-180 (1120 aa). NCAM-120 is GPI-linked, while NCAM‑140 and NCAM-180 are type I transmembrane glycoproteins (4-6). Additional alternate splicing adds considerable diversity to all three forms, and extracellular proteolytic processing is possible for NCAM-180 (7, 8). NCAM-1 is synthesized as a 761 aa preproprecursor that contains a 19 aa signal sequence, a 722 aa GPI-linked mature region, and a 20 aa C-terminal prosegment (4). The molecule contains five C-2 type Ig-like domains and two fibronectin type-III domains. Human to mouse, NCAM-1 is 93% aa identical. NCAM-1 appears to be highly sialylated. The polysialyation of NCAM-1 reduces its adhesive property and increases its neurite outgrowth promoting features (9). NCAM-1 in the adult brain shows a decline of sialylation relative to earlier developmental periods. In regions that retain a high degree of neuronal plasticity, however, the adult brain continues to express polysialylation-NCAM-1, suggesting sialylation of NCAM-1 is involved in regenerative processes and synaptic plasticity (10-13).

References
  1. Burg, M.A. et al. (1995) J. Neurosci. Res. 41:49.
  2. Storms, S.D. and U. Rutishauser (1998) J Biol. Chem. 273:27124.
  3. Margolis, R.K. et al. (1996) Perspect. Dev. Neurobiol. 3:273.
  4. Dickson, G. et al. (1987) Cell 50:1119.
  5. Lanier, L.L. et al. (1991) J. Immunol. 146:4421.
  6. Hemperly, J.J. et al. (1990) J. Mol. Neurosci. 2:71.
  7. Rutishauser, U.and C. Goridis (1986) Trends Genet. 2:72.
  8. Vawter, M.P. et al. (2001) Exp. Neurol. 172:29.
  9. Rutihauser, U. (1990) Adv. Exp. Med. Biol. 265:179.
  10. Becker, C.G. et al. (1996) J. Neurosci. Res. 45:143.
  11. Doherty, P. et al. (1995) J. Neurobiol. 26:437.
  12. Eckardt, M. et al. (2000) J. Neurosci. 20:5234.
  13. Muller, D. et al. (1996) Neuron 17:413.
Long Name
Neural Cell Adhesion Molecule
Entrez Gene IDs
4684 (Human); 17967 (Mouse); 24586 (Rat)
Alternate Names
CD56 / NCAM-1; CD56 antigen; CD56; MSK39; NCAM1; N-CAM-1; NCAM-1; NCAMantigen recognized by monoclonal 5.1H11; neural cell adhesion molecule 1; neural cell adhesion molecule, NCAM

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