1PHO

CRYSTAL STRUCTURES EXPLAIN FUNCTIONAL PROPERTIES OF TWO E. COLI PORINS


Experimental Data Snapshot

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

  • 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 co ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHOPORIN
A
330Escherichia coli (strain K12)Gene Names: phoE (ompE)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
PhoE
Find proteins for P02932 (Escherichia coli (strain K12))
Go to UniProtKB:  P02932
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.222 
  • Space Group: P 3 2 1
Unit Cell:
Length (Å)Angle (°)
a = 119.900α = 90.00
b = 119.900β = 90.00
c = 51.900γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORmodel building
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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