1MPM

MALTOPORIN MALTOSE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.226 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal structures of various maltooligosaccharides bound to maltoporin reveal a specific sugar translocation pathway.

Dutzler, R.Wang, Y.F.Rizkallah, P.J.Rosenbusch, J.P.Schirmer, T.

(1996) Structure 4: 127-134

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Maltoporin (which is encoded by the lamB gene) facilitates the translocation of maltodextrins across the outer membrane of E. coli. In particular, it is indispensable for the transport of long maltooligosaccharides, as these do not pass through non-s ...

    Maltoporin (which is encoded by the lamB gene) facilitates the translocation of maltodextrins across the outer membrane of E. coli. In particular, it is indispensable for the transport of long maltooligosaccharides, as these do not pass through non-specific porins. An understanding of this intriguing capability requires elucidation of the structural basis.


    Related Citations: 
    • Structural Basis for Sugar Translocation Through Maltoporin Channels at 3.1 A Resolution
      Schirmer, T.,Keller, T.A.,Wang, Y.F.,Rosenbusch, J.P.
      (1995) Science 267: 512


    Organizational Affiliation

    Department of Structural Biology, Biozentrum, University of Basel, CH-4056 Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MALTOPORIN
A, B, C
421Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: lamB (malB)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
LamB Maltoporin
Find proteins for P02943 (Escherichia coli (strain K12))
Go to UniProtKB:  P02943
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download SDF File 
Download CCD File 
A, B, C
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
GLC
Query on GLC

Download SDF File 
Download CCD File 
A, B, C
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.226 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 129.800α = 90.00
b = 211.700β = 90.00
c = 218.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
MOSFLMdata reduction
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-03-12
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2015-11-25
    Type: Database references
  • Version 1.4: 2017-03-15
    Type: Derived calculations