6I2P

Crystal structure of the Mycobacterium tuberculosis PknB kinase domain (L33E mutant) in complex with its substrate GarA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insights into the functional versatility of an FHA domain protein in mycobacterial signaling.

Wagner, T.Andre-Leroux, G.Hindie, V.Barilone, N.Lisa, M.N.Hoos, S.Raynal, B.Vulliez-Le Normand, B.O'Hare, H.M.Bellinzoni, M.Alzari, P.M.

(2019) Sci.Signal. 12: --

  • DOI: 10.1126/scisignal.aav9504
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Forkhead-associated (FHA) domains are modules that bind to phosphothreonine (pThr) residues in signaling cascades. The FHA-containing mycobacterial protein GarA is a central element of a phosphorylation-dependent signaling pathway that redirects meta ...

    Forkhead-associated (FHA) domains are modules that bind to phosphothreonine (pThr) residues in signaling cascades. The FHA-containing mycobacterial protein GarA is a central element of a phosphorylation-dependent signaling pathway that redirects metabolic flux in response to amino acid starvation or cell growth requirements. GarA acts as a phosphorylation-dependent ON/OFF molecular switch. In its nonphosphorylated ON state, the GarA FHA domain engages in phosphorylation-independent interactions with various metabolic enzymes that orchestrate nitrogen flow, such as 2-oxoglutarate decarboxylase (KGD). However, phosphorylation at the GarA N-terminal region by the protein kinase PknB or PknG triggers autoinhibition through the intramolecular association of the N-terminal domain with the FHA domain, thus blocking all downstream interactions. To investigate these different FHA binding modes, we solved the crystal structures of the mycobacterial upstream (phosphorylation-dependent) complex PknB-GarA and the downstream (phosphorylation-independent) complex GarA-KGD. Our results show that the phosphorylated activation loop of PknB serves as a docking site to recruit GarA through canonical FHA-pThr interactions. However, the same GarA FHA-binding pocket targets an allosteric site on nonphosphorylated KGD, where a key element of recognition is a phosphomimetic aspartate. Further enzymatic and mutagenesis studies revealed that GarA acted as a dynamic allosteric inhibitor of KGD by preventing crucial motions in KGD that are necessary for catalysis. Our results provide evidence for physiological phosphomimetics, supporting numerous mutagenesis studies using such approaches, and illustrate how evolution can shape a single FHA-binding pocket to specifically interact with multiple phosphorylated and nonphosphorylated protein partners.


    Organizational Affiliation

    Leicester Tuberculosis Research Group (LTBRG) and Leicester Institute of Structural and Chemical Biology (LISCB), Department of Respiratory Science & Department of Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK.,Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528 & Université Paris Diderot, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France. pedro.alzari@pasteur.fr marco.bellinzoni@pasteur.fr.,Institut Pasteur, Unité de Microbiologie Structurale, CNRS UMR 3528 & Université Paris Diderot, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France.,Institut Pasteur, Plateforme de Biophysique Moléculaire, 25 Rue du Docteur Roux, 75724 Paris Cedex 15, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase PknB
A, B
280Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 1 
Gene Names: pknB
EC: 2.7.11.1
Find proteins for P9WI81 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WI81
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Glycogen accumulation regulator GarA
D, E
163Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: garA
Find proteins for P9WJA9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WJA9
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
UNK-UNK-UNK-UNK-UNK
C
5N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
ACP
Query on ACP

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Download CCD File 
A, B
PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER
ADENOSINE-5'-[BETA, GAMMA-METHYLENE]TRIPHOSPHATE
C11 H18 N5 O12 P3
UFZTZBNSLXELAL-IOSLPCCCSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
UNK
Query on UNK
C
L-PEPTIDE LINKINGC4 H9 N O2

--

TPO
Query on TPO
A, B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 69.310α = 90.00
b = 70.460β = 90.00
c = 188.600γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
PHASERphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2019-05-22
    Type: Initial release