JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Identification of mycobacterial GarA as a substrate of protein kinase G from M. tuberculosis using a KESTREL-based proteome wide approach.

Signal transduction in bacteria is generally mediated via two-component systems. These systems depend on the transfer of a phosphate molecule from a donor to an acceptor by histidine kinases, thereby activating the acceptor to allow downstream signaling/activation. Several bacterial genomes, including the genome of M. tuberculosis, were shown to encode eukaryotic-like kinases. To better understand the function of these kinases and the regulatory networks within which they operate, identification of downstream targets is essential. We here present a straightforward approach for the identification of bacterial Ser/Thr-kinase substrates. This approach is based on the KESTREL (Kinase Tracking and Substrate Elucidation) procedure combined with reversed-phase chromatography and two-dimensional gel electrophoresis. Using this method, GarA was identified as one potential substrate for the mycobacterial Ser/Thr-protein kinase G (PknG). These results show that the modified KESTREL approach can be successfully employed for the identification of substrates for bacterial Ser/Thr-kinases.

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