3IO0

Crystal structure of EtuB from Clostridium kluyveri


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of a trimeric bacterial microcompartment shell protein, EtuB, associated with ethanol utilisation in Clostridium kluyveri.

Heldt, D.Frank, S.Seyedarabi, A.Ladakis, D.Parsons, J.B.Warren, M.J.Pickersgill, R.W.

(2009) Biochem.J. 423: 199-207

  • DOI: 10.1042/BJ20090780

  • PubMed Abstract: 
  • It has been suggested that ethanol metabolism in the strict anaerobe Clostridium kluyveri occurs within a metabolosome, a subcellular proteinaceous bacterial microcompartment. Two bacterial microcompartment shell proteins [EtuA (ethanol utilization s ...

    It has been suggested that ethanol metabolism in the strict anaerobe Clostridium kluyveri occurs within a metabolosome, a subcellular proteinaceous bacterial microcompartment. Two bacterial microcompartment shell proteins [EtuA (ethanol utilization shell protein A) and EtuB] are found encoded on the genome clustered with the genes for ethanol utilization. The function of the bacterial microcompartment is to facilitate fermentation by sequestering the enzymes, substrates and intermediates. Recent structural studies of bacterial microcompartment proteins have revealed both hexamers and pentamers that assemble to generate the pseudo-icosahedral bacterial microcompartment shell. Some of these shell proteins have pores on their symmetry axes. Here we report the structure of the trimeric bacterial microcompartment protein EtuB, which has a tandem structural repeat within the subunit and pseudo-hexagonal symmetry. The pores in the EtuB trimer are within the subunits rather than between symmetry related subunits. We suggest that the evolutionary advantage of this is that it releases the pore from the rotational symmetry constraint allowing more precise control of the fluxes of asymmetric molecules, such as ethanol, across the pore. We also model EtuA and demonstrate that the two proteins have the potential to interact to generate the casing for a metabolosome.


    Organizational Affiliation

    Centre for Molecular Processing, School of Biosciences, University of Kent, Giles Lane, Canterbury, Kent, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EtuB protein
A
230Clostridium kluyveri (strain ATCC 8527 / DSM 555 / NCIMB 10680)Mutation(s): 0 
Find proteins for A5N734 (Clostridium kluyveri (strain ATCC 8527 / DSM 555 / NCIMB 10680))
Go to UniProtKB:  A5N734
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.188 
  • Space Group: I 21 3
Unit Cell:
Length (Å)Angle (°)
a = 173.410α = 90.00
b = 173.410β = 90.00
c = 173.410γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
ADSCdata collection
SCALAdata scaling
MOSFLMdata reduction
SHELXSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance