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J Biol Chem. 2002 Sep 27;277(39):36489-98. Epub 2002 Jul 22.

QM, a putative tumor suppressor, regulates proto-oncogene c-yes.

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  • 1Division of Chemistry and Molecular Engineering, Seoul National University, Seoul 151-742, Korea.


The QM gene encodes a 24.5 kDa ribosomal protein L10 known to be highly homologous to a Jun-binding protein (Jif-1), which inhibits the formation of Jun-Jun dimers. Here we have carried out screening with the c-Yes protein and found that a QM homologous protein showed interactions with c-Yes and other Src family members. We have found that two different regions of QM protein were associated with the SH3 domain of c-Yes. The QM protein does not contain canonical SH3 binding motifs or previously reported amino acid fragments showing interaction with SH3 domains. Several c-Yes kinase activity assays indicated that the QM protein reduced c-Yes kinase activity by 70% and that this suppression is related not only to the two SH3 binding regions but also to the C-terminal region of QM. Moreover, our autophosphorylation assays clarified that this regulation resulted from the inhibition of c-Yes autophosphorylation. Immunofluorescence studies showed that the QM proteins and c-Yes are able to interact in various tumor cell lines in vivo. The increases of the c-Yes protein and mRNA levels were detected when the QM was transfected. These results suggest that the QM protein might be a regulator for various signal transduction pathways involving SH3 domain-containing membrane proteins.

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