1MPM

MALTOPORIN MALTOSE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.226 
  • R-Value Observed: 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

  • DOI: 10.1016/s0969-2126(96)00016-0
  • Structures With Same Primary Citation

  • 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 coliMutation(s): 0 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
LamB Maltoporin in complex with maltose
Find proteins for P02943 (Escherichia coli (strain K12))
Go to UniProtKB:  P02943
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GLC
Query on GLC

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

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

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.8α = 90
b = 211.7β = 90
c = 218.2γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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