Recombinant Human CD44v5 Fc Chimera Protein, CF Summary
Accession # P16070-12
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 500 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.
When Recombinant Human CD44v5 Fc Chimera (Catalog # 10146-CD) is immobilized at 1 µg/mL (100 µL/well), Biotinylated Hyaluronan binds with an ED50 of 5‑30 ng/mL.
2 μg/lane of Recombinant Human CD44v5 Fc Chimera (Catalog # 10146-CD) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 95-110 kDa and 190-220 kDa, respectively.
CD44 is a ubiquitously expressed protein that is the major receptor for hyaluronan and exerts control over cell growth and migration (1‑3). Human CD44 has a 20 amino acid (aa) signal sequence, an extracellular domain (ECD) with a 100 aa hyaluronan‑binding disulfide‑stabilized link region and a 325‑530 aa stem region, a 21 aa transmembrane domain, and a 72 aa cytoplasmic domain. CD44 transcripts undergo complex alternative splicing, and, within the stem, ten variably spliced exons (v1‑10 corresponding to exons 6‑15; although human CD44 lacks v1/exon 6) produce multiple protein isoforms (1‑4). The standard or hematopoietic form, CD44H, does not include the variable segments (1‑4). Cancer aggressiveness and T cell activation have been correlated with expression of specific isoforms (1, 4, 5). Human CD44v5 contains exon 10 and is associated with tumor progression and metastasis in many types of cancer including breast, colon, lung, renal, skin, and ovarian tumors (6, 12). With variable N‑ and O‑glycosylation and splicing within the stalk, CD44 can range from 80 to 200 kDa (1). Within the N‑terminal invariant portion of the ECD (aa 21‑222), human CD44 shares 76%, 76%, 86%, 83% and 79% identity with corresponding mouse, rat, equine, canine and bovine CD44, respectively. The many reported functions of CD44 fall within three categories (1). First, CD44 binds hyaluronan and other ligands within the extracellular matrix and can function as a "platform" for growth factors and metalloproteinases. Second, CD44 can function as a co‑receptor that modifies activity of receptors including MET and the ERBB family of tyrosine kinases. Third, the CD44 intracellular domain links the plasma membrane to the actin cytoskeleton via the ERM proteins, ezrin, radixin and moesin. CD44 can be synthesized in a soluble form (6) or may be cleaved at multiple sites by either membrane‑type matrix metalloproteinases, or ADAM proteases to produce soluble ectodomains (8, 9). The cellular portion may then undergo gamma secretase‑dependent intramembrane cleavage to form an A beta‑like transmembrane portion and a cytoplasmic signaling portion that affects gene expression (10, 11). These cleavage events are thought to promote metastasis by enhancing tumor cell motility and growth (1, 8). CD44v5 plays important role in cancer progression involving in cell migration and invasion and is considered a functional cancer biomarker (6, 12).
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