描述:
DDR1, also known as CAK, CD167a, RTK6, and TrkE, is a 120 -140 kDa type I transmembrane
glycoprotein that belongs to the discoidin-like domain containing subfamily of receptor tyrosine
kinases .Mature human DDR2 consists of a 398 amino acid (aa) extracellular domain (ECD) that
includes the discoidinlike domain, a 27 aa transmembrane segment, and a 470 aa cytoplasmic
region with a tyrosine kinase domain. 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. Compared to isoform
DDR1b, DDR1a lacks 37 aa’s that include a Shcinteracting NPxY motif in the cytoplasmic
juxtamembrane region. Two additional kinase deficient splice forms are expressed in colon
cancer. The discoidinlike domain mediates binding to collagens I- V. DDR1 selectively recognizes
the triple helical structure of collagen. It is expressed on the cell surface as a dimer which can
include different isoforms.DDR1 oligomerization enhances collagen binding and also modulates
collagen fibrillogenesis.The transmembrane segment contains a leucine zipper and GxxxG motif,
but neither is exclusively required for dimerization. Collagen binding induces prolonged
autophosphorylation, including the NPxY motif. Collagen binding also results in the
proteolytic cleavage of a tyrosine phosphorylated 60 kDa C-terminal fragment (CTF), and a 60
kDa ECD fragment. TIMP3 and TAPI1 inhibit shedding of the ECD fragment but not the CTF.
Overexpression of DDR1a promotes MMP-2 activation and results in an increased invasiveness
of a glioblastoma cell line; DDR1b does not.
原厂资料:
DDR1, also known as CAK, CD167a, RTK6, and TrkE, is a 120 -140 kDa type I transmembrane
glycoprotein that belongs to the discoidin-like domain containing subfamily of receptor tyrosine
kinases .Mature human DDR2 consists of a 398 amino acid (aa) extracellular domain (ECD) that
includes the discoidinlike domain, a 27 aa transmembrane segment, and a 470 aa cytoplasmic
region with a tyrosine kinase domain. 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. Compared to isoform
DDR1b, DDR1a lacks 37 aa’s that include a Shcinteracting NPxY motif in the cytoplasmic
juxtamembrane region. Two additional kinase deficient splice forms are expressed in colon
cancer. The discoidinlike domain mediates binding to collagens I- V. DDR1 selectively recognizes
the triple helical structure of collagen. It is expressed on the cell surface as a dimer which can
include different isoforms.DDR1 oligomerization enhances collagen binding and also modulates
collagen fibrillogenesis.The transmembrane segment contains a leucine zipper and GxxxG motif,
but neither is exclusively required for dimerization. Collagen binding induces prolonged
autophosphorylation, including the NPxY motif. Collagen binding also results in the
proteolytic cleavage of a tyrosine phosphorylated 60 kDa C-terminal fragment (CTF), and a 60
kDa ECD fragment. TIMP3 and TAPI1 inhibit shedding of the ECD fragment but not the CTF.
Overexpression of DDR1a promotes MMP-2 activation and results in an increased invasiveness
of a glioblastoma cell line; DDR1b does not.