PduA K26A S40GSG mutant, from Salmonella enterica serovar Typhimurium LT2

Experimental Data Snapshot

  • Resolution: 3.10 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 

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This is version 1.2 of the entry. See complete history


Selective molecular transport through the protein shell of a bacterial microcompartment organelle.

Chowdhury, C.Chun, S.Pang, A.Sawaya, M.R.Sinha, S.Yeates, T.O.Bobik, T.A.

(2015) Proc Natl Acad Sci U S A 112: 2990-2995

  • DOI: https://doi.org/10.1073/pnas.1423672112
  • Primary Citation of Related Structures:  
    4QIF, 4QIG, 4RBT, 4RBU, 4RBV

  • PubMed Abstract: 

    Bacterial microcompartments are widespread prokaryotic organelles that have important and diverse roles ranging from carbon fixation to enteric pathogenesis. Current models for microcompartment function propose that their outer protein shell is selectively permeable to small molecules, but whether a protein shell can mediate selective permeability and how this occurs are unresolved questions. Here, biochemical and physiological studies of structure-guided mutants are used to show that the hexameric PduA shell protein of the 1,2-propanediol utilization (Pdu) microcompartment forms a selectively permeable pore tailored for the influx of 1,2-propanediol (the substrate of the Pdu microcompartment) while restricting the efflux of propionaldehyde, a toxic intermediate of 1,2-propanediol catabolism. Crystal structures of various PduA mutants provide a foundation for interpreting the observed biochemical and phenotypic data in terms of molecular diffusion across the shell. Overall, these studies provide a basis for understanding a class of selectively permeable channels formed by nonmembrane proteins.

  • Organizational Affiliation

    Molecular Biology Institute, UCLA-DOE Institute for Genomics and Proteomics, and Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095 bobik@iastate.edu yeates@mbi.ucla.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Propanediol utilization protein PduA
A, B, C, D, E
A, B, C, D, E, F, G
102Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 1 
Gene Names: PduA
Find proteins for P0A1C7 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P0A1C7 
Go to UniProtKB:  P0A1C7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A1C7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.10 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 
  • Space Group: F 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 236.8α = 90
b = 236.8β = 90
c = 236.8γ = 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: 2015-02-18
    Type: Initial release
  • Version 1.1: 2015-03-11
    Changes: Database references
  • Version 1.2: 2015-03-25
    Changes: Database references