Abstract
The APS adapter protein is rapidly tyrosine-phosphorylated following insulin stimulation. In insulin-stimulated 3T3-L1 adipocytes, APS co-precipitated with phosphorylated c-Cbl. In CHO.T-APS cells overexpressing the insulin receptor and APS, APS co-precipitated with c-Cbl but not in CHO.T cells which do not express APS. APS-mediated recruitment of c-Cbl to the insulin receptor led to rapid ubiquitination of the insulin receptor β-subunit in CHO.T-APS but not in parental CHO.T cells. These results suggest that the function of APS is to facilitate coupling of the insulin receptor to c-Cbl in order to catalyse the ubiquitination of the receptor and initiation of internalisation or degradation.
Original language | English (US) |
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Pages (from-to) | 31-34 |
Number of pages | 4 |
Journal | FEBS Letters |
Volume | 475 |
Issue number | 1 |
DOIs | |
State | Published - Jun 9 2000 |
Externally published | Yes |
Keywords
- Adapter protein
- Adapter protein containing a PH and SH2 domain
- Insulin receptor
- Tyrosine kinase
- Ubiquitination
- c-Cbl
ASJC Scopus subject areas
- Biophysics
- Structural Biology
- Biochemistry
- Molecular Biology
- Genetics
- Cell Biology