4A2M

Structure of the periplasmic domain of the heparin and heparan sulphate sensing hybrid two component system BT4663 in apo and ligand bound forms


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.268 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Scissor Blade-Like Closing Mechanism Implicated in Transmembrane Signaling in a Bacteroides Hybrid Two-Component System.

Lowe, E.C.Basle, A.Czjzek, M.Firbank, S.J.Bolam, D.N.

(2012) Proc.Natl.Acad.Sci.USA 109: 7298

  • DOI: 10.1073/pnas.1200479109
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Signaling across the membrane in response to extracellular stimuli is essential for survival of all cells. In bacteria, responses to environmental changes are predominantly mediated by two-component systems, which are typically composed of a membrane ...

    Signaling across the membrane in response to extracellular stimuli is essential for survival of all cells. In bacteria, responses to environmental changes are predominantly mediated by two-component systems, which are typically composed of a membrane-spanning sensor histidine kinase and a cytoplasmic response regulator. In the human gut symbiont Bacteroides thetaiotaomicron, hybrid two-component systems are a key part of the bacterium's ability to sense and degrade complex carbohydrates in the gut. Here, we identify the activating ligand of the hybrid two-component system, BT4663, which controls heparin and heparan sulfate acquisition and degradation in this prominent gut microbe, and report the crystal structure of the extracellular sensor domain in both apo and ligand-bound forms. Current models for signal transduction across the membrane involve either a piston-like or rotational displacement of the transmembrane helices to modulate activity of the linked cytoplasmic kinases. The structures of the BT4663 sensor domain reveal a significant conformational change in the homodimer on ligand binding, which results in a scissor-like closing of the C-termini of each protomer. We propose this movement activates the attached intracellular kinase domains and represents an allosteric mechanism for bacterial transmembrane signaling distinct from previously described models, thus expanding our understanding of signal transduction across the membrane, a fundamental requirement in many important biological processes.


    Organizational Affiliation

    Institute for Cell and Molecular Biosciences, Newcastle University, The Medical School, Newcastle upon Tyne NE2 4HH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TWO-COMPONENT SYSTEM SENSOR HISTIDINE KINASE/RESPONSE
A, B, C, D
795Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482)Mutation(s): 0 
Find proteins for Q89YR8 (Bacteroides thetaiotaomicron (strain ATCC 29148 / DSM 2079 / NCTC 10582 / E50 / VPI-5482))
Go to UniProtKB:  Q89YR8
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NGS
Query on NGS

Download SDF File 
Download CCD File 
A, B, C, D
2-(acetylamino)-2-deoxy-6-O-sulfo-beta-D-glucopyranose
N-ACETYL-D-GLUCOSAMINE-6-SULFATE
C8 H15 N O9 S
WJFVEEAIYIOATH-FMDGEEDCSA-N
 Ligand Interaction
GCD
Query on GCD

Download SDF File 
Download CCD File 
A, B, C, D
4,5-DEHYDRO-D-GLUCURONIC ACID
C6 H8 O6
IAKKJSVSFCTLRY-YKKSOZKNSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.4 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.268 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 111.120α = 90.00
b = 80.830β = 93.96
c = 228.940γ = 90.00
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-02
    Type: Initial release
  • Version 1.1: 2012-05-23
    Type: Other
  • Version 1.2: 2014-12-03
    Type: Data collection