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Use of antipeptide antibodies to probe the catalytic activity of p37v-mos
B Singh1, F al-Bagdadi, J X Liu
1University of Texas M.D. Anderson Cancer Center, Houston 77030.
Abstract:
Several site-directed antipeptide antibodies were generated to probe the kinase function of p37v-mos. Anti-mos(37-55) antibodies allowed autophosphorylation of p37v-mos, as well as transphosphorylation of exogenously added purified bovine vimentin. Rabbit antipeptide antibodies against v-mos residues 158-70, 194-206, 260-271, and 363-374 and a mouse monoclonal antibody against residues 344-359 completely inhibited p37v-mos protein kinase activity in vitro. p37v-mos autophosphorylation and vimentin transphosphorylation were affected similarly. These results suggest important roles for insert and the carboxy-terminal domains in the catalytic activity of p37v-mos.
Insights
Site-directed antibodies reveal key regions of the p37v-mos protein kinase. Antibodies targeting specific sites either enabled or inhibited kinase activity, highlighting the importance of insert and carboxy-terminal domains.
Area of Science:
- Molecular Biology
- Biochemistry
- Oncology
Background:
- The p37v-mos protein is a proto-oncogene product with significant kinase activity.
- Understanding the functional domains of p37v-mos is crucial for comprehending its role in cellular processes and oncogenesis.
Purpose of the Study:
- To investigate the kinase function of p37v-mos using site-directed antipeptide antibodies.
- To identify specific domains of p37v-mos critical for its catalytic activity.
Main Methods:
- Generation of site-directed antipeptide antibodies against various regions of p37v-mos.
- Assays for autophosphorylation of p37v-mos.
- Transphosphorylation assays using purified bovine vimentin as a substrate.
- In vitro inhibition assays to assess the impact of antibodies on protein kinase activity.
Main Results:
- Antibodies against residues 37-55 of p37v-mos facilitated both autophosphorylation and transphosphorylation of vimentin.
- Antibodies targeting v-mos residues 158-70, 194-206, 260-271, 363-374, and a monoclonal antibody against residues 344-359 completely inhibited p37v-mos kinase activity.
- Both autophosphorylation and vimentin transphosphorylation were similarly affected by the inhibitory antibodies.
Conclusions:
- The insert domain and the carboxy-terminal domain of p37v-mos play critical roles in its catalytic activity.
- Site-directed antibodies are effective tools for dissecting protein kinase function and domain importance.