4QPJ

2.7 Angstrom Structure of a Phosphotransferase in Complex with a Receiver Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.742 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural asymmetry in a conserved signaling system that regulates division, replication, and virulence of an intracellular pathogen.

Willett, J.W.Herrou, J.Briegel, A.Rotskoff, G.Crosson, S.

(2015) Proc.Natl.Acad.Sci.USA 112: E3709-E3718

  • DOI: 10.1073/pnas.1503118112
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We have functionally and structurally defined an essential protein phosphorelay that regulates expression of genes required for growth, division, and intracellular survival of the global zoonotic pathogen Brucella abortus. Our study delineates phosph ...

    We have functionally and structurally defined an essential protein phosphorelay that regulates expression of genes required for growth, division, and intracellular survival of the global zoonotic pathogen Brucella abortus. Our study delineates phosphoryl transfer through this molecular pathway, which initiates from the sensor kinase CckA and proceeds through the ChpT phosphotransferase to two regulatory substrates: CtrA and CpdR. Genetic perturbation of this system results in defects in cell growth and division site selection, and a specific viability deficit inside human phagocytic cells. Thus, proper control of B. abortus division site polarity is necessary for survival in the intracellular niche. We further define the structural foundations of signaling from the central phosphotransferase, ChpT, to its response regulator substrate, CtrA, and provide evidence that there are at least two modes of interaction between ChpT and CtrA, only one of which is competent to catalyze phosphoryltransfer. The structure and dynamics of the active site on each side of the ChpT homodimer are distinct, supporting a model in which quaternary structure of the 2:2 ChpT-CtrA complex enforces an asymmetric mechanism of phosphoryl transfer between ChpT and CtrA. Our study provides mechanistic understanding, from the cellular to the atomic scale, of a conserved transcriptional regulatory system that controls the cellular and infection biology of B. abortus. More generally, our results provide insight into the structural basis of two-component signal transduction, which is broadly conserved in bacteria, plants, and fungi.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637; Howard Taylor Ricketts Laboratory, University of Chicago, Argonne National Laboratory, Argonne, IL 60439;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phosphotransferase
A, B
243Brucella abortus (strain 2308)Mutation(s): 0 
Gene Names: chpT
EC: 2.7.99.-
Find proteins for Q2YQA5 (Brucella abortus (strain 2308))
Go to UniProtKB:  Q2YQA5
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cell cycle response regulator CtrA
C, D
152Brucella abortus (strain 2308)Mutation(s): 0 
Gene Names: ctrA
Find proteins for Q2YQA4 (Brucella abortus (strain 2308))
Go to UniProtKB:  Q2YQA4
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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A, B, C
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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A, B, C
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 124.951α = 90.00
b = 124.951β = 90.00
c = 136.332γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXmodel building
HKL-2000data reduction
PHENIXphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-07-15
    Type: Initial release
  • Version 1.1: 2015-08-05
    Type: Database references
  • Version 1.2: 2017-11-22
    Type: Refinement description