The proto-oncogene p120(Cbl) is a downstream substrate of the Hck protein-tyrosine kinase.
Biochem Biophys Res Commun
; 257(1): 129-38, 1999 Apr 02.
Article
in En
| MEDLINE
| ID: mdl-10092522
ABSTRACT
Hematopoietic cell kinase (Hck) is a member of the Src-family of protein tyrosine kinases. We have found that upon enzymatic activation of Hck by the heavy metal mercuric chloride, there was a rapid increase in the levels of tyrosine phosphorylation of several proteins including the proto-oncogene p120(Cbl). Fibroblasts that are transformed with an activated allele of Hck exhibit constitutive Cbl phosphorylation. Upon Fcgamma receptor activation, a more physiologically relevant extracellular signal, Cbl is tyrosine phosphorylated and the Src-family selective inhibitor, PP1, can prevent this phosphorylation on Cbl. Hck phosphorylates Cbl in vitro and the interaction between Cbl and Hck is direct, requiring Hck's unique, SH3 and SH2 domains for optimal binding. Using a novel estrogen-regulated chimera of Hck we have shown a hormone-dependent association between Hck and Cbl in murine fibroblasts. This work suggests that Cbl serves as a key mediator of Hck induced signalling in hematopoietic cells.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Protein-Tyrosine Kinases
/
Proto-Oncogene Proteins
/
Ubiquitin-Protein Ligases
Limits:
Animals
/
Humans
Language:
En
Journal:
Biochem Biophys Res Commun
Year:
1999
Document type:
Article
Affiliation country:
Canada