c-yes protein kinase is associated with a 38 kD protein in cerebellum

Area of Science:

• Biochemistry
• Molecular Biology
• Neuroscience

Background:

• The yes proto-oncogene encodes the p62c-yes protein, a member of the src-family of tyrosine kinases.
• Tyrosine kinases play crucial roles in cellular signaling pathways.
• Understanding protein interactions involving these kinases is vital for deciphering their functions.

Purpose of the Study:

• To investigate the association of p62c-yes with other cellular proteins.
• To characterize the properties of proteins interacting with p62c-yes.
• To compare the yes-associated protein with the src-associated p38 protein.

Main Methods:

• Immunoprecipitation of chicken cerebellar membranes using anti-yes IgG.
• In vitro phosphorylation of the immunoprecipitated complex.
• Analysis of protein complexes using sedimentation gradients and peptide mapping.

Main Results:

• p62c-yes was found associated with a 38 kD cellular protein in chicken cerebellum.
• Both p62c-yes and the 38 kD protein were phosphorylated exclusively on tyrosine.
• The yes-associated 38 kD protein is indistinguishable from p38, a protein previously found associated with p60c-src.
• A fraction of p62c-yes formed a complex with the 38 kD protein, with an estimated molecular mass of 150 kD.

Conclusions:

• p62c-yes associates with a 38 kD protein in chicken cerebellum.
• This 38 kD protein is identical to p38, previously identified as a binding partner for p60c-src.
• The association of p38 with multiple src-family kinases suggests its potential role as a regulatory or structural component.