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QM, a putative tumor suppressor, regulates proto-oncogene c-yes
Hyung Suk Oh1, Haeyoung Kwon, Suk Kyun Sun
1Division of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-742, Korea.
The Journal of Biological Chemistry
|July 26, 2002
Summary
The QM protein interacts with c-Yes, a key kinase in cell signaling. QM inhibits c-Yes activity by binding to its SH3 domain, suggesting QM
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- The QM gene encodes ribosomal protein L10, homologous to Jun-interacting factor-1 (Jif-1).
- Jif-1 is known to inhibit Jun-Jun dimer formation.
- Src family kinases, including c-Yes, play critical roles in cellular signaling.
Purpose of the Study:
- To investigate the interaction between QM protein and c-Yes kinase.
- To determine the functional consequences of this interaction on c-Yes kinase activity.
- To explore the potential role of QM in regulating signaling pathways.
Main Methods:
- Protein interaction screening using c-Yes.
- Identification of QM protein regions interacting with the c-Yes SH3 domain.
- Kinase activity and autophosphorylation assays.
- Immunofluorescence studies in tumor cell lines.
- Analysis of c-Yes protein and mRNA levels following QM transfection.
Main Results:
- QM protein interacts with c-Yes and other Src family members.
- Two distinct regions of QM bind to the c-Yes SH3 domain, independent of canonical motifs.
- QM significantly reduces c-Yes kinase activity by 70%, primarily by inhibiting autophosphorylation.
- QM and c-Yes interact in vivo within tumor cell lines.
- QM transfection leads to increased c-Yes protein and mRNA levels.
Conclusions:
- QM protein acts as a negative regulator of c-Yes kinase activity.
- The interaction involves specific QM regions binding to the c-Yes SH3 domain.
- QM may regulate signal transduction pathways involving SH3 domain-containing proteins.