2PRN

RHODOPSEUDOMONAS BLASTICA PORIN, TRIPLE MUTANT E1M, E99W, A116W


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.184 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Porin mutants with new channel properties.

Schmid, B.Maveyraud, L.Kromer, M.Schulz, G.E.

(1998) Protein Sci 7: 1603-1611

  • DOI: https://doi.org/10.1002/pro.5560070714
  • Primary Citation of Related Structures:  
    1BH3, 2PRN, 3PRN, 5PRN, 6PRN, 7PRN, 8PRN

  • PubMed Abstract: 

    The general diffusion porin from Rhodopseudomonas blastica was produced in large amounts in Escherichia coli inclusion bodies and (re)natured to the exact native structure. Here, we report on 13 mutants at the pore eyelet giving rise to new diffusion properties as measured in planar lipid bilayer experiments. The crystal structures of seven of these mutants were established. The effects of charge-modifying mutations at the pore eyelet are consistent with the known selectivity for cations. Deletions of 16 and 27 residues of the constriction loop L3 resulted in labile trimers and pores. The reduction of the eyelet cross section by introducing tryptophans gave rise to a closely correlated decrease of the conductivities. A mutant with six newly introduced tryptophans in the eyelet closed its pore in a defined manner within seconds under a voltage of 20 mV, suggesting the existence of two states. The results indicate that the pore can be engineered in a rational manner.


  • Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Freiburg im Breisgau, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PORIN289Fuscovulum blasticumMutation(s): 2 
Membrane Entity: Yes 
UniProt
Find proteins for P39767 (Fuscovulum blasticum)
Explore P39767 
Go to UniProtKB:  P39767
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP39767
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.184 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.26α = 90
b = 104.26β = 90
c = 124.15γ = 120
Software Package:
Software NamePurpose
CCP4model building
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
CCP4phasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2023-08-09
    Changes: Database references, Derived calculations, Other, Refinement description
  • Version 1.4: 2024-05-22
    Changes: Data collection