Evidence for interaction between v- Mos and a p34cdc2 isoform, p35cdk.
The c-mos gene product (c-Mos) encodes a serine/threonine kinase required for activation of pre-MPF (maturation-promoting factor) to MPF in oocytes undergoing meiosis and also for stabilization of MPF leading to metaphase arrest in unfertilized eggs. In order to determine whether the v-mos gene product (v- Mos) causes neoplastic transformation via interaction with cell cycle control elements, we have searched for proteins that interact with v- Mos. Extracts of NIH3T3 cells transformed by v- Mos encoded by Moloney murine sarcoma virus (Mo-MuSV) were examined by gel filtration, by immunoprecipitation with antibodies to a conserved region of p34cdc2, and by binding to beads that contain cross-linked p13suc1, a protein known to bind p34cdc2. Gel filtration detected a 500-kDa complex that contained v- Mos and a p34cdc2 isoform, termed p35cdk. The 500-kDa macromolecular complex also exhibited histone H1 phosphorylation activity, consistent with the presence of a cdc2 isoform. The identity of p35cdk is based on its recognition by anti-cdc2 PSTAIR but not by anti-cdc2 C-terminal antibodies, which detect authentic p34cdc2. Structures containing v- Mos and p35cdk were also detected by experiments involving co-immunoprecipitation of v- Mos with anti-cdc2 PSTAIR antibodies. Furthermore, both v- Mos and the p35cdk co-precipitated with p13suc1-Sepharose beads. Our findings raise the possibility of a v-Mos-p35cdk regulatory interaction in cells transformed by Mo-MuSV.[1]References
- Evidence for interaction between v-Mos and a p34cdc2 isoform, p35cdk. Bai, W., Singh, B., Yang, Y., Arlinghaus, R.B. Oncogene (1992) [Pubmed]
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