Crystal Structure of EutL from Clostridium Perfringens bound to ethanolamine

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 

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An allosteric model for control of pore opening by substrate binding in the EutL microcompartment shell protein.

Thompson, M.C.Cascio, D.Leibly, D.J.Yeates, T.O.

(2015) Protein Sci 24: 956-975

  • DOI: https://doi.org/10.1002/pro.2672
  • Primary Citation of Related Structures:  
    4EDI, 4FDZ, 4TM6, 4TME

  • PubMed Abstract: 

    The ethanolamine utilization (Eut) microcompartment is a protein-based metabolic organelle that is strongly associated with pathogenesis in bacteria that inhabit the human gut. The exterior shell of this elaborate protein complex is composed from a few thousand copies of BMC-domain shell proteins, which form a semi-permeable diffusion barrier that provides the interior enzymes with substrates and cofactors while simultaneously retaining metabolic intermediates. The ability of this protein shell to regulate passage of substrate and cofactor molecules is critical for microcompartment function, but the details of how this diffusion barrier can allow the passage of large cofactors while still retaining small intermediates remain unclear. Previous work has revealed two conformations of the EutL shell protein, providing substantial evidence for a gated pore that might allow the passage of large cofactors. Here we report structural and biophysical evidence to show that ethanolamine, the substrate of the Eut microcompartment, acts as a negative allosteric regulator of EutL pore opening. Specifically, a series of X-ray crystal structures of EutL from Clostridium perfringens, along with equilibrium binding studies, reveal that ethanolamine binds to EutL at a site that exists in the closed-pore conformation and which is incompatible with opening of the large pore for cofactor transport. The allosteric mechanism we propose is consistent with the cofactor requirements of the Eut microcompartment, leading to a new model for EutL function. Furthermore, our results suggest the possibility of redox modulation of the allosteric mechanism, opening potentially new lines of investigation.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, California, 90095.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ethanolamine utilization protein EutL
A, B, C
225Clostridium perfringens E str. JGS1987Mutation(s): 0 
Gene Names: eutLAC3_1081
Find proteins for Q8XLZ0 (Clostridium perfringens (strain 13 / Type A))
Explore Q8XLZ0 
Go to UniProtKB:  Q8XLZ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8XLZ0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.162 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.148 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.96α = 90
b = 87.96β = 90
c = 251.91γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-25
    Type: Initial release
  • Version 1.1: 2015-06-10
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Database references, Derived calculations, Other, Refinement description, Source and taxonomy
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations, Refinement description