描述:
DDR2, also known as TYR010 and TKT, is a widely expressed 130 kDa type I transmembrane
glycoprotein belonging to the discoidin-like domain containing subfamily of receptor tyrosine
kinases. Mature human DDR2 consists of a 378 amino acid (aa) extracellular domain (ECD)
that includes the discoidinlike domain, a 22 aa transmembrane segment, and a 434 aa
cytoplasmic domain that includes the kinase domain. Within the ECD, human DDR2 shares
53% aa sequence identity with DDR1. It shares 97% and 96% aa sequence identity with mouse
and rat DDR2, respectively. The discoidinlike domain mediates DDR2 interactions with
collagens I, III, and X. Collagens II and V are less efficacious ligands. DDR2 selectively recognizes
the triple helical structure of collagen compared to monomeric or denatured collagen. Within
collagen II, the D2 period is required for DDR2 binding. The D1 period is additionally required to
trigger DDR2 autophosphorylation. The ECD of DDR2 exists as a noncovalent dimer in solution,
and dimerization of the receptor greatly enhances collagen binding. DDR2 interaction with
collagen I inhibits collagen fibrillogenesis and alters collagen fiber morphology. Ligand binding
induces DDR2 autophosphorylation in the cytoplasmic domain, which promotes associations
with Shc and Src. In addition to the above mechanism, DDR2 exhibits a distinct interaction with
collagen X. A region other than the discoidinlike domain of DDR2 recognizes the nonhelical
NC1 domain of collagen X, and this interaction does not lead to receptor autophosphorylation.
原厂资料:
DDR2, also known as TYR010 and TKT, is a widely expressed 130 kDa type I transmembrane
glycoprotein belonging to the discoidin-like domain containing subfamily of receptor tyrosine
kinases. Mature human DDR2 consists of a 378 amino acid (aa) extracellular domain (ECD)
that includes the discoidinlike domain, a 22 aa transmembrane segment, and a 434 aa
cytoplasmic domain that includes the kinase domain. Within the ECD, human DDR2 shares
53% aa sequence identity with DDR1. It shares 97% and 96% aa sequence identity with mouse
and rat DDR2, respectively. The discoidinlike domain mediates DDR2 interactions with
collagens I, III, and X. Collagens II and V are less efficacious ligands. DDR2 selectively recognizes
the triple helical structure of collagen compared to monomeric or denatured collagen. Within
collagen II, the D2 period is required for DDR2 binding. The D1 period is additionally required to
trigger DDR2 autophosphorylation. The ECD of DDR2 exists as a noncovalent dimer in solution,
and dimerization of the receptor greatly enhances collagen binding. DDR2 interaction with
collagen I inhibits collagen fibrillogenesis and alters collagen fiber morphology. Ligand binding
induces DDR2 autophosphorylation in the cytoplasmic domain, which promotes associations
with Shc and Src. In addition to the above mechanism, DDR2 exhibits a distinct interaction with
collagen X. A region other than the discoidinlike domain of DDR2 recognizes the nonhelical
NC1 domain of collagen X, and this interaction does not lead to receptor autophosphorylation.