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New Test System for Serine/Threonine Protein Kinase Inhibitors Screening: E. coli APHVIII/Pk25 design
O B Bekker1, M G Alekseeva, D I Osolodkin
1Vavilov Institute of General Genetics, Russian Academy of Sciences.
Acta Naturae
|June 1, 2012
Summary
A novel bacterial test system using aminoglycoside phosphotransferase VIII (APHVIII) and Pk25 protein kinase efficiently screens for serine/threonine protein kinase inhibitors. This system enhances bacterial sensitivity to kanamycin when inhibitors are present.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Protein kinases play crucial roles in cellular signaling pathways.
- Inhibiting specific protein kinases is a key strategy in developing targeted therapies.
- Existing screening methods for kinase inhibitors can be complex and time-consuming.
Purpose of the Study:
- To develop an efficient and accessible bacterial-based screening system for serine/threonine protein kinase inhibitors.
- To validate the utility of the APHVIII/Pk25 system in identifying kinase inhibitors.
- To explore the structural basis for inhibitor binding within the Pk25 kinase.
Main Methods:
- Engineered a bacterial expression system in E. coli using modified aminoglycoside phosphotransferase VIII (APHVIII) and Streptomyces coelicolor Pk25 protein kinase.
- Assessed bacterial resistance to kanamycin as a readout for APHVIII phosphorylation.
- Utilized indolylmaleimide compounds as known protein kinase inhibitors.
- Performed molecular modeling and docking studies to analyze inhibitor-protein interactions.
Main Results:
- Successfully established an E. coli-based system expressing functional APHVIII and Pk25.
- Demonstrated that Pk25 autophosphorylates and phosphorylates APHVIII, conferring kanamycin resistance.
- Showed that indolylmaleimide inhibitors effectively reduced Pk25 activity and restored kanamycin sensitivity.
- Structural modeling revealed conserved binding sites and potential interactions for ATP-competitive inhibitors.
Conclusions:
- The developed APHVIII/Pk25 E. coli system provides an efficient platform for screening small molecule protein kinase inhibitors.
- This system facilitates the primary selection of ATP-competitive inhibitors.
- The findings offer insights into the structural mechanisms of Pk25 inhibition.
