DDR1, Fc Chimera (DDR1) Human Active Protein

DDR1, also known as CAK, CD167a, RTK6, and TrkE, is a 120-140kD type I transmembrane glycoprotein that belongs to the discoidin-like domain containing subfamily of receptor tyrosine kinases (1, 2). Mature human DDR2 consists of a 398 amino acid (aa) extracellular domain (ECD) that includes the discoidin-like domain, a 27 aa transmembrane segment, and a 470 aa cytoplasmic region with a tyrosine kinase domain (3). Within the ECD, human DDR1 shares 53% aa sequence identity with human DDR2 and 93% with mouse and rat DDR1. DDR1 is expressed on epithelial tissues, activated monocytes and neutrophils, and in several cancers (2, 4). Compared to isoform DDR1b, DDR1a lacks 37 aa's that include a Shc-interacting NPxY motif in the cytoplasmic juxtamembrane region (5). Two additional kinase deficient splice forms are expressed in colon cancer (6). The discoidin-like domain mediates binding to collagens I-V (1, 7, 8). DDR1 selectively recognizes the triple helical structure of collagen (7, 8). It is expressed on the cell surface as a dimer which can include different isoforms (5, 9). DDR1 oligomerization enhances collagen binding and also modulates collagen fibrillogenesis (10, 11). The transmembrane segment contains a leucine zipper and GxxxG motif, but neither is exclusively required for dimerization (9). Collagen binding induces prolonged autophosphorylation, including the NPxY motif (7, 8). Collagen binding also results in the proteolytic cleavage of a tyrosine phosphorylated 60kD C-terminal fragment (CTF), and a 60kD ECD fragment (12, 13). TIMP3 and TAPI-1 inhibit shedding of the ECD fragment but not the CTF (12). Overexpression of DDR1a promotes MMP-2 activation and results in an increased invasiveness of a glioblastoma cell line; DDR1b does not (14).

The recombinant human DDR1/Fc is a disulfide-linked homodimeric protein. Based on N-terminal amino acid sequencing, the recombinant protein starts at Asp 21. Each monomer has a calculated molecular mass of approximately 70.5kD. As a result of glycosylation, recombinant human DDR1 migrates as an approximately 90-95kD protein on a SDS-PAGE under reducing conditions.

Small volumes of DDR1, Fc Chimera 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.

MBS638129 is an active protein targeting DDR1, Fc Chimera. Also known as DDR1, Fc Chimera, Recombinant, Human (Discoidin Domain Receptor 1, CAK, CD167, EC 2.7.10.1, EDDR1, HGK2, MCK10, NEP, NTRK4, PTK3, PTK3A, RTK6, TRKE). Reactive in Human.