1UUN

Main porin from Mycobacterium smegmatis (MspA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1126/science.1094114
  • Also Cited By: 2V9U

  • 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 smegmati ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MSPA
A, B
184Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)Mutation(s): 1 
Gene Names: mspA
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
MspA mycobacterial porin
Find proteins for A0QR29 (Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0QR29
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.226 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 113.860α = 90.00
b = 113.860β = 90.00
c = 229.300γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SOLVEphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-02-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance