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- W2016021369 abstract "The essential Mycobacterium tuberculosis Ser/Thr protein kinase (STPK), PknB, plays a key role in regulating growth and division, but the structural basis of activation has not been defined. Here, we provide biochemical and structural evidence that dimerization through the kinase-domain (KD) N-lobe activates PknB by an allosteric mechanism. Promoting KD pairing using a small-molecule dimerizer stimulates the unphosphorylated kinase, and substitutions that disrupt N-lobe pairing decrease phosphorylation activity in vitro and in vivo. Multiple crystal structures of two monomeric PknB KD mutants in complex with nucleotide reveal diverse inactive conformations that contain large active-site distortions that propagate > 30 Å from the mutation site. These results define flexible, inactive structures of a monomeric bacterial receptor KD and show how back-to-back N-lobe dimerization stabilizes the active KD conformation. This general mechanism of bacterial receptor STPK activation affords insights into the regulation of homologous eukaryotic kinases that form structurally similar dimers." @default.
- W2016021369 created "2016-06-24" @default.
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- W2016021369 date "2010-12-01" @default.
- W2016021369 modified "2023-10-17" @default.
- W2016021369 title "Allosteric Activation Mechanism of the Mycobacterium tuberculosis Receptor Ser/Thr Protein Kinase, PknB" @default.
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- W2016021369 doi "https://doi.org/10.1016/j.str.2010.09.019" @default.
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