Linked Life Data

11494134

Source:http://linkedlifedata.com/resource/pubmed/id/11494134

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
30
pubmed:dateCreated
2001-8-8
pubmed:abstractText
The Cbl proto-oncogene product is tyrosine phosphorylated in response to a wide variety of stimuli. Cbl and the Abl nonreceptor tyrosine kinase both bind to SH3 domains from the SH2/SH3 adaptor Nck, and are candidate effectors for Nck function. Numerous additional SH2- and SH3-domain-mediated interactions are also possible between Cbl, Abl, and Nck. We find that these three signaling proteins associate when overexpressed in mammalian cells and can regulate each other's activity. Co-expression of wt Cbl together with c-Abl, the activity of which is normally repressed in vivo, led to extensive Abl-dependent phosphorylation of Cbl. The major proline-rich region of Cbl was required for its phosphorylation by c-Abl, but not by a constitutively activated Abl mutant, suggesting Cbl activates c-Abl by engaging its SH3 domain. Efficient phosphorylation of Cbl and its stable association with Abl required the SH2 domain of Abl, suggesting that SH2-phosphotyrosine interactions prevent dissociation of active Abl from Cbl. We also show that overexpression of Nck could repress the phosphorylation of Cbl by Abl in vivo. Studies with Nck mutants suggested that the Nck SH2 domain is responsible for inhibiting the activity of Abl toward both Cbl and Nck itself, most likely by competing with the Abl SH2 for tyrosine-phosphorylated binding sites.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0950-9232
pubmed:author
pubmed:issnType
Print
pubmed:day
5
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
4058-69
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:11494134-Adaptor Proteins, Signal Transducing, pubmed-meshheading:11494134-Binding Sites, pubmed-meshheading:11494134-Cell Line, pubmed-meshheading:11494134-Genes, abl, pubmed-meshheading:11494134-Humans, pubmed-meshheading:11494134-Kidney, pubmed-meshheading:11494134-Macromolecular Substances, pubmed-meshheading:11494134-Oncogene Proteins, pubmed-meshheading:11494134-Phosphorylation, pubmed-meshheading:11494134-Protein Binding, pubmed-meshheading:11494134-Protein Processing, Post-Translational, pubmed-meshheading:11494134-Proto-Oncogene Proteins, pubmed-meshheading:11494134-Proto-Oncogene Proteins c-abl, pubmed-meshheading:11494134-Proto-Oncogene Proteins c-cbl, pubmed-meshheading:11494134-Recombinant Fusion Proteins, pubmed-meshheading:11494134-Structure-Activity Relationship, pubmed-meshheading:11494134-Transfection, pubmed-meshheading:11494134-Ubiquitin-Protein Ligases, pubmed-meshheading:11494134-src Homology Domains
pubmed:year
2001
pubmed:articleTitle
Regulation of Cbl phosphorylation by the Abl tyrosine kinase and the Nck SH2/SH3 adaptor.
pubmed:affiliation
Laboratory of Molecular Medicine, Children's Hospital and Department of Microbiology and Molecular Genetics, Harvard Medical School, 300 Longwood Avenue, Boston, Massachusetts, MA 02115, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't