1PHO

CRYSTAL STRUCTURES EXPLAIN FUNCTIONAL PROPERTIES OF TWO E. COLI PORINS

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

Crystal structures explain functional properties of two E. coli porins.

Cowan, S.W., Schirmer, T., Rummel, G., Steiert, M., Ghosh, R., Pauptit, R.A., Jansonius, J.N., Rosenbusch, J.P.

(1992) Nature 358: 727-733

  • DOI: 10.1038/358727a0
  • Primary Citation of Related Structures:  
    1PHO

  • PubMed Abstract: 

    • Porins form aqueous channels that aid the diffusion of small hydrophilic molecules across the outer membrane of Gram-negative bacteria. The crystal structures of matrix porin and phosphoporin both reveal trimers of identical subunits, each subunit consisting of a 16-stranded anti-parallel beta-barrel containing a pore ...

    Porins form aqueous channels that aid the diffusion of small hydrophilic molecules across the outer membrane of Gram-negative bacteria. The crystal structures of matrix porin and phosphoporin both reveal trimers of identical subunits, each subunit consisting of a 16-stranded anti-parallel beta-barrel containing a pore. A long loop inside the barrel contributes to a constriction of the channel where the charge distribution affects ion selectivity. The structures explain at the molecular level functional characteristics and their alterations by known mutations.

    Related Citations: 
    • Trigonal Crystals of Porin from Escherichia Coli
      Pauptit, R.A., Zhang, H., Rummel, G., Schirmer, T., Jansonius, J.N., Rosenbusch, J.P.
      (1991) J Mol Biol 218: 505
    • A Common Channel-Forming Motif in Evolutionarily Distant Porins
      Pauptit, R.A., Schirmer, T., Jansonius, J.N., Rosenbusch, J.P., Parker, M.W., Tucker, A.D., Tsernoglou, D., Weiss, M.S., Schulz, G.E.
      (1991) J Struct Biol 107: 136
    Organizational Affiliation: 

    Department of Structural Biology, University of Basel, Switzerland.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PHOSPHOPORINA330Escherichia coliMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P02932 (Escherichia coli (strain K12))
Explore P02932 
Go to UniProtKB:  P02932
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02932
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Work: 0.222 
  • R-Value Observed: 0.222 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.9α = 90
b = 119.9β = 90
c = 51.9γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance