3F69

Crystal structure of the Mycobacterium tuberculosis PknB mutant kinase domain in complex with KT5720


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Auto-activation mechanism of the Mycobacterium tuberculosis PknB receptor Ser/Thr kinase.

Mieczkowski, C.Iavarone, A.T.Alber, T.

(2008) Embo J. 27: 3186-3197

  • DOI: 10.1038/emboj.2008.236
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Many Ser/Thr protein kinases are activated by autophosphorylation, but the mechanism of this process has not been defined. We determined the crystal structure of a mutant of the Ser/Thr kinase domain (KD) of the mycobacterial sensor kinase PknB in co ...

    Many Ser/Thr protein kinases are activated by autophosphorylation, but the mechanism of this process has not been defined. We determined the crystal structure of a mutant of the Ser/Thr kinase domain (KD) of the mycobacterial sensor kinase PknB in complex with an ATP competitive inhibitor and discovered features consistent with an activation complex. The complex formed an asymmetric dimer, with the G helix and the ordered activation loop of one KD in contact with the G helix of the other. The activation loop of this putative 'substrate' KD was disordered, with the ends positioned at the entrance to the partner KD active site. Single amino-acid substitutions in the G-helix interface reduced activation-loop phosphorylation, and multiple replacements abolished KD phosphorylation and kinase activation. Phosphorylation of an inactive mutant KD was reduced by G-helix substitutions in both active and inactive KDs, as predicted by the idea that the asymmetric dimer mimics a trans-autophosphorylation complex. These results support a model in which a structurally and functionally asymmetric, 'front-to-front' association mediates autophosphorylation of PknB and homologous kinases.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3220, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase pknB
A, B
311Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 3 
Gene Names: pknB
EC: 2.7.11.1
Find proteins for P9WI81 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WI81
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
XDR
Query on XDR

Download SDF File 
Download CCD File 
A, B
hexyl (5S,6R,8R)-6-hydroxy-5-methyl-13-oxo-5,6,7,8-tetrahydro-13H-5,8-epoxy-4b,8a,14-triazadibenzo[b,h]cycloocta[1,2,3,4-jkl]cyclopenta[e]-as-indacene-6-carboxylate
KT5720
C32 H29 N3 O5
ZDVKBGNYCWCWDZ-MWOZDUBJSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A, B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
XDRIC50: 1000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.218 
  • Space Group: F 41 3 2
Unit Cell:
Length (Å)Angle (°)
a = 297.557α = 90.00
b = 297.557β = 90.00
c = 297.557γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
PHASERphasing
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2017-10-25
    Type: Advisory, Refinement description