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- W2000427888 abstract "Although Mycobacterium tuberculosis (M. tb) comprises 11 serine/threonine protein kinases, the mechanisms of regulation of these kinases and the nature of their endogenous substrates remain largely unknown. Herein, we characterized the M. tb kinase PknL by demonstrating that it expresses autophosphorylation activity and phosphorylates Rv2175c. On-target dephosphorylation/MALDI-TOF for identification of phosphorylated peptides was used in combination with LC-ESI/MS/MS for localization of phosphorylation sites. By doing so, five phosphorylated threonine residues were identified in PknL. Among them, we showed that the activation loop phosphorylated residues Thr173 and Thr175 were essential for the autophosphorylation activity of PknL. Phosphorylation of the activation loop Thr173 residue is also required for optimal PknL-mediated phosphorylation of Rv2175c. Together, our results indicate that phosphorylation of the PknL activation loop Thr residues not only controls PknL kinase activity but is also required for recruitment and phosphorylation of its substrate. Rv2175c was found to be phosphorylated when overexpressed and purified from Mycobacterium smegmatis as 2-DE indicated the presence of different phosphorylated isoforms. Given the presence of the dcw gene cluster in the close vicinity of the pknL/Rv2175c locus, and its conservation in all mycobacterial species, we propose that PknL/Rv2175c may represent a functional pair in the regulation of mycobacterial cell division and cell envelope biosynthesis." @default.
- W2000427888 created "2016-06-24" @default.
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- W2000427888 date "2008-02-01" @default.
- W2000427888 modified "2023-10-15" @default.
- W2000427888 title "TheMycobacterium tuberculosis serine/threonine kinase PknL phosphorylates Rv2175c: Mass spectrometric profiling of the activation loop phosphorylation sites and their role in the recruitment of Rv2175c" @default.
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- W2000427888 doi "https://doi.org/10.1002/pmic.200700442" @default.
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