Recombinant Human CRTAC1 Protein, CF

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R&D Systems Recombinant Proteins and Enzymes
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Recombinant Human CRTAC1 Protein, CF Summary

Product Specifications

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to induce adhesion of ATDC5 mouse chondrogenic cells. The ED50 for this effect is 0.25-1.5 μg/mL.
Mouse myeloma cell line, NS0-derived human CRTAC1 protein
Ser28-Cys661, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Structure / Form
Predicted Molecular Mass
69 kDa
83-90 kDa, reducing conditions

Product Datasheets

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.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 250 μg/mL in 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.
Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: CRTAC1

Cartilage acidic protein 1 (CRTAC1), also known as CEP‑68, is a 95 kDa glycosylated protein that contains four FG‑GAP domains and one EGF‑like domain. An integrin‑binding RGD motif is present in the human protein but absent in the mouse and rat proteins. Mature human CRTAC1 shares 89% amino acid sequence identity with mouse and rat CRTAC. It is secreted by chondrocytes into the extracellular matrix of cartilage (1, 2). It is also up‑regulated in type II alveolar epithelial cells upon dexamethasone exposure (3). CRTAC1B, otherwise known as LOTUS, is an 85 kDa alternatively spliced isoform that has a substituted C‑terminal region with a potential transmembrane segment (2, 4). CRTAC1B is preferentially expressed in select regions of the brain on neuronal growth cones and neurite shafts (2, 4). It associates with the Nogo Receptor (NgR) and prevents Nogo‑induced growth cone collapse (4, 5). In mouse, CRTAC1B plays an important role in axonal bundling and formation of the lateral olfactory tract (4).

  1. Steck, E. et al. (2001) Biochem. J. 353:169.
  2. Steck, E. et al. (2007) Matrix Biol. 26:30.
  3. Ballard, P.L. et al. (2010) Am. J. Physiol. Lung Cell. Mol. Physiol. 299:L36.
  4. Sato, Y. et al. (2011) Science 333:769.
  5. Kurihara, Y. et al. (2012) Biochem. Biophys. Res. Commun. 418:390.
Long Name
Cartilage Acidic Protein 1
Entrez Gene IDs
55118 (Human); 72832 (Mouse); 171438 (Rat)
Alternate Names
ASPIC; ASPIC1; ASPIC1CEP-68acidic secreted protein in cartilage; cartilage acidic protein 1; CEP68; chondrocyte expressed protein 68 kDa CEP-68,68 kDa chondrocyte-expressed protein; CRTAC1; FLJ10320


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Recombinant Human CRTAC1 Protein, CF
By Anonymous on 05/17/2016
Application: In vitro bioactivity in cell culture