Characterization of Gas6, a member of the superfamily of G domain-containing proteins, as a ligand for Rse and Axl.
J Biol Chem
; 271(16): 9785-9, 1996 Apr 19.
Article
en En
| MEDLINE
| ID: mdl-8621659
ABSTRACT
Rse, Ax1, and c-Mer comprise a family of cell adhesion molecule-related tyrosine kinase receptors. Human Gas6 was recently shown to act as a ligand for both human Rse (Godowski et al., 1995) and human Ax1 (Varnum et al., 1995). Gas6 contains an NH2-terminal Gla domain followed by four epidermal growth factor-like repeats and tandem globular (G) domains. The G domains are related to those found in sex hormone-binding globulin and to those utilized by laminin and agrin for binding to the dystroglycan complex. A series of Gas6 variants were tested for their ability to bind to Rse and Ax1. The Gla domain and epidermal growth factor-like repeats were not required for receptor binding, as deletion variants of Gas6 which lacked these domains bound to the extracellular domains of both Rse and Axl. A deletion variant of Gas6 containing just the G domain region was shown to activate Rse phosphorylation. These results provide evidence that G domains can act as signaling molecules by activating transmembrane receptor tyrosine kinases. Furthermore, they provide a structural link between the activation of cell adhesion related receptors and the control of cell growth and differentiation by the G domain-containing superfamily of proteins.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas
/
Proteínas Oncogénicas
/
Proteínas Tirosina Quinasas Receptoras
/
Péptidos y Proteínas de Señalización Intercelular
Límite:
Humans
Idioma:
En
Revista:
J Biol Chem
Año:
1996
Tipo del documento:
Article
País de afiliación:
Estados Unidos