Recombinant Human Collagen XXIII alpha 1/COL23A1 Protein, CF Summary
Glu111-Lys540, with an N-terminal 6-His tag
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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.
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 200 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.
Background: Collagen XXIII alpha 1
Collagen XXIII alpha 1 (sometimes abbreviated COL23A1) is a ~75 kDa type II transmembrane nonfibrillar collagen that is a member of the collagenous transmembrane protein superfamily (1, 2). This family also includes collagens XIII, XVII, XXV and non-collagens with triple-helical regions such as ectodysplasin A, class A macrophage scavenger receptors, and MARCO (2). The human Collagen XXIII mRNA encodes a 540 amino acid (aa) protein containing a 34 aa N-terminal cytoplasmic domain, a 21 aa transmembrane (TM) domain and a 485 aa extracellular domain (ECD). The ECD contains a coiled-coil consensus sequence to aid homotrimerization (aa 64 - 69), a furin cleavage site (aa 105 - 110), a pair of cysteines thought to form intermolecular disulfides (aa 106 and 108), and three collagen domains (1, 3 - 5). The C-terminal 20 aa, including cysteines at aa 525 and 537 of Collagen XXIII, is conserved among TM collagen proteins. Proteolytic cleavage, occurring mainly in the golgi, allows the Collagen XXIII ectodomain to be secreted as a soluble trimer of ~60 kDa subunits (1, 5). Cell surface cleavage can also occur but is slow, presumably due to presence of Collagen XXIII in lipid raft membrane domains (5). The protein database includes three variants of 537, 316 and 309 aa with various portions missing or substituted; all appear to lack TM segments (6). The human Collagen XXIII ECD shares 92%, 93%, 85%, 85% and 84% aa identity with mouse, rat, canine, equine and bovine Collagen XXIII, respectively. Collagen XXIII is concentrated at sites of cell contact in epithelia, and is thought to be an adhesion molecule (2, 4). Its upregulation has been correlated with aggressiveness in transformed cells, particularly in prostate cancer (1, 7).
- Banyard, J. et al. (2003) J. Biol. Chem. 278:20989.
- Franzke, C-W. et al. (2005) J. Biol. Chem. 280:4005.
- Snellman, A. et al. (2007) J. Biol. Chem. 282:14898.
- Koch, M. et al. (2006) J. Biol. Chem. 281:21546.
- Veit, G. et al. (2007) J. Biol. Chem. 282:27424.
- Entrez Accession # EAW53833, EAW53834, and AAH42428.
- Banyard, J. et al. (2007) Clin. Cancer Res. 13:2634.
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