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© Research
Publication : Biochemical and biophysical research communications

Identification of Fyn-binding proteins in MC/9 mast cells using mass spectrometry

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Biochemical and biophysical research communications - 10 Oct 2003

Nahm DH, Tkaczyk C, Fukuishi N, Colucci-Guyon E, Gilfillan AM, Metcalfe DD

Link to Pubmed [PMID] – 14511671

Biochem. Biophys. Res. Commun. 2003 Oct;310(1):202-8

Fyn is a Src kinase known to have an essential role in mast cell degranulation induced following aggregation of the high affinity IgE-receptor. Although Fyn possesses SH2 and SH3 protein binding domains, the molecules that interact with Fyn have not been characterized in mast cells. We thus analyzed Fyn-binding proteins in MC/9 mast cells to explore the Fyn-mediated signaling pathway. On mass spectrometric analysis of proteins binding to the SH2 and SH3 domains of Fyn, we identified six proteins that bind to Fyn including vimentin, pyruvate kinase, p62 ras-GAP associated phosphoprotein, SLP-76, HS-1, and FYB. Among these proteins, vimentin and pyruvate kinase have not been shown to bind to Fyn. After IgE-receptor mediated stimulation, binding of vimentin to Fyn was increased; and this interaction was via binding to the SH2, but not the SH3, domain of Fyn. Mast cells from vimentin-deficient mice showed enhanced mediator release and tyrosine phosphorylation of intracellular proteins including NTAL and LAT. The observation that vimentin and pyruvate kinase bind to Fyn provides additional insight into Fyn-mediated signaling pathways, and suggests a critical role for Fyn in mast cell degranulation in interacting with both cytosolic and structural proteins.

http://www.ncbi.nlm.nih.gov/pubmed/14511671