DDR2 Active Protein

DDR-2, also known as TYR010 and TKT, is a widely expressed 130kD type I transmembrane glycoprotein belonging to the discoidin-like domain containing subfamily of receptor tyrosine kinases (1). Mature human DDR-2 consists of a 378 aa extracellular domain (ECD) that includes the discoidin-like domain, a 22 aa transmembrane segment, and a 434 aa cytoplasmic domain that includes the kinase domain (2). Within the ECD, human DDR-2 shares 53% aa sequence identity with DDR-1 and 97% aa sequence identity with mouse DDR-2. The discoidin-like domain mediates DDR-2 interactions with collagens I, III, and X (3-5). Collagens II and V are less efficacious ligands (3). DDR-2 selectively recognizes the triple helical structure of collagen compared to monomeric or denatured collagen (3, 5, 6). Within collagen II, the D2 period is required for DDR-2 binding, and the D1 period is additionally required to trigger DDR-2 autophosphorylation (6). The ECD of DDR-2 exists as a non-covalent dimer in solution, and dimerization of the receptor greatly enhances collagen binding (4, 7). DDR-2 interaction with collagen I inhibits collagen fibrillogenesis and alters collagen fiber morphology (7). Ligand binding induces DDR-2 autophosphorylation in the cytoplasmic domain (3, 5, 8), which promotes associations with Shc and Src (9). In addition to the above mechanism, DDR-2 exhibits a distinct interaction with collagen X. A region other than the discoidin-like domain of DDR-2 recognizes the non-helical NC1 domain of collagen X, and this interaction does not lead to receptor autophosphorylation (5). Activation of DDR-2 by collagen induces upregulation of MMP-1, -2, and -13 as well as DDR-2 itself (3, 8, 10). DDR-2 is implicated in collagenous matrix destruction and cell invasiveness (8, 10). DDR-2 is also upregulated in several pathological conditions, including hepatic fibrosis following injury, rheumatoid and osteoarthritis, and smooth muscle cell hyperplasia (8, 10-12).

Small volumes of DDR2 active protein vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

MBS637031 is an active protein targeting DDR2. Also known as DDR2, Recombinant, Human (Discoidin Domain Receptor 2).