Format

Send to

Choose Destination
EMBO J. 1991 Feb;10(2):277-88.

Role of dimerization and modification of the CSF-1 receptor in its activation and internalization during the CSF-1 response.

Author information

1
Department of Developmental Biology and Cancer, Albert Einstein College of Medicine, Bronx, NY 10461.

Abstract

We have used kinetic and cross-linking approaches to study CSF-1-induced changes in the structure and function of the CSF-1R. Addition of CSF-1 to cells stimulates or stabilizes non-covalent CSF-1R dimerization resulting in activation of the CSF-1R kinase and the tyrosine phosphorylation of the receptor and certain cytoplasmic proteins. The non-covalent dimers become covalently linked via disulfide bonds and/or are subsequently further modified. These modified forms are selectively internalized. Pre-treatment of cells with the alkylating agent, iodoacetic acid (IAA), selectively inhibits covalent dimerization, modification and internalization but enhances protein tyrosine phosphorylation. It is proposed that ligand-induced non-covalent dimerization activates the CSF-1R kinase, whereas the covalent dimerization and subsequent modification lead to kinase inactivation, phosphotyrosine dephosphorylation and internalization of the receptor--ligand complex.

PMID:
1825054
PMCID:
PMC452644
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wiley Icon for PubMed Central
Loading ...
Support Center