2pzi
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(New page: 200px<br /><applet load="2pzi" size="350" color="white" frame="true" align="right" spinBox="true" caption="2pzi, resolution 2.40Å" /> '''Crystal Structure of...)
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Revision as of 12:14, 23 January 2008
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Crystal Structure of Protein kinase PknG from Mycobacterium tuberculosis in Complex with Tetrahydrobenzothiophene AX20017
Overview
The pathogenicity of mycobacteria such as Mycobacterium tuberculosis is, closely associated with their capacity to survive within host macrophages., A crucial virulence factor for intracellular mycobacterial survival is, protein kinase G (PknG), a eukaryotic-like serine/threonine protein kinase, expressed by pathogenic mycobacteria that blocks the intracellular, degradation of mycobacteria in lysosomes. Inhibition of PknG with the, highly selective low-molecular-weight inhibitor AX20017 results in, mycobacterial transfer to lysosomes and killing of the mycobacteria. Here, we report the 2.4 A x-ray crystal structure of PknG in complex with, AX20017. The unique multidomain topology of PknG reveals a central kinase, domain that is flanked by N- and C-terminal rubredoxin and, tetratrico-peptide repeat domains, respectively. Directed mutagenesis, suggests that the rubredoxin domain functions as a regulator of PknG, kinase activity. The structure of PknG-AX20017 further reveals that the, inhibitor is buried deep within the adenosine-binding site, targeting an, active conformation of the kinase domain. Remarkably, although the, topology of the kinase domain is reminiscent of eukaryotic kinases, the, AX20017-binding pocket is shaped by a unique set of amino acid side chains, that are not found in any human kinase. Directed mutagenesis of the unique, set of residues resulted in a drastic loss of the compound's inhibitory, potency. Our results explain the specific mode of action of AX20017 and, demonstrate that virulence factors highly homologous to host molecules can, be successfully targeted to block the proliferation of M. tuberculosis.
About this Structure
2PZI is a Single protein structure of sequence from Mycobacterium tuberculosis with , , and as ligands. Active as Non-specific serine/threonine protein kinase, with EC number 2.7.11.1 Full crystallographic information is available from OCA.
Reference
From the Cover: Structural basis for the specific inhibition of protein kinase G, a virulence factor of Mycobacterium tuberculosis., Scherr N, Honnappa S, Kunz G, Mueller P, Jayachandran R, Winkler F, Pieters J, Steinmetz MO, Proc Natl Acad Sci U S A. 2007 Jul 17;104(29):12151-6. Epub 2007 Jul 6. PMID:17616581
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