2PZI

Crystal Structure of Protein kinase PknG from Mycobacterium tuberculosis in Complex with Tetrahydrobenzothiophene AX20017

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 

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This is version 1.3 of the entry. See complete history. 


Literature

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, M.O.

(2007) Proc Natl Acad Sci U S A 104: 12151-12156

  • DOI: 10.1073/pnas.0702842104
  • Primary Citation of Related Structures:  
    2PZI

  • PubMed Abstract: 

    • 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 eukaryoti ...

    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.

    Organizational Affiliation: 

    Biozentrum, University of Basel, CH-4056 Basel, Switzerland.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Probable serine/threonine-protein kinase pknG A, B681Mycobacterium tuberculosisMutation(s): 0 
Gene Names: pknG
EC: 2.7.11.1
Find proteins for P9WI73 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WI73 
Go to UniProtKB:  P9WI73
Protein Feature View
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  • Reference Sequence
Small Molecules
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
AXXIC50:  3000   nM  Binding MOAD
AXXIC50 :  800   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 122.553α = 90
b = 122.553β = 90
c = 243.749γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
XDSdata reduction
XSCALEdata scaling
SHARPphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-07-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description