1UUN

Main porin from Mycobacterium smegmatis (MspA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

The Structure of a Mycobacterial Outer-Membrane Channel

Faller, M.Niederweis, M.Schulz, G.E.

(2004) Science 303: 1189

  • DOI: https://doi.org/10.1126/science.1094114
  • Primary Citation of Related Structures:  
    1UUN

  • PubMed Abstract: 

    Mycobacteria have low-permeability outer membranes that render them resistant to most antibiotics. Hydrophilic nutrients can enter by way of transmembrane-channel proteins called porins. An x-ray analysis of the main porin from Mycobacterium smegmatis, MspA, revealed a homooctameric goblet-like conformation with a single central channel. This is the first structure of a mycobacterial outer-membrane protein. No structure-related protein was found in the Protein Data Bank. MspA contains two consecutive beta barrels with nonpolar outer surfaces that form a ribbon around the porin, which is too narrow to fit the thickness of the mycobacterial outer membrane in contemporary models.


  • Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Albert-Ludwigs-Universität, Albertstrasse 21, 79104 Freiburg im Breisgau, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MSPA
A, B
184Mycolicibacterium smegmatisMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for A0QR29 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QR29 
Go to UniProtKB:  A0QR29
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0QR29
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.227 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.86α = 90
b = 113.86β = 90
c = 229.3γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection
  • Version 1.4: 2024-05-08
    Changes: Data collection, Database references, Other