1AF6

MALTOPORIN SUCROSE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Channel specificity: structural basis for sugar discrimination and differential flux rates in maltoporin.

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

(1997) J.Mol.Biol. 272: 56-63

  • DOI: 10.1006/jmbi.1997.1224
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Maltoporin (LamB) facilitates the diffusion of maltodextrins across the outer membrane of E. coli. The structural basis for the specificity of the channel is investigated by X-ray structure analysis of maltoporin in complex with the disaccharides suc ...

    Maltoporin (LamB) facilitates the diffusion of maltodextrins across the outer membrane of E. coli. The structural basis for the specificity of the channel is investigated by X-ray structure analysis of maltoporin in complex with the disaccharides sucrose, trehalose, and melibiose. The sucrose complex, determined to 2.4 A resolution, shows that the glucosyl moiety is partly inserted into the channel constriction, while the bulky fructosyl residue appears to be hindered to enter the constriction, thus interfering with its further translocation. One of the glucosyl moieties of trehalose is found in a similar position as the glucosyl moiety of sucrose, whereas melibiose appears disordered when bound to maltoporin. A comparison with the previously reported maltoporin-maltose complex sheds light on the basis for sugar discrimination, and explains the different permeation rates observed for the saccharides.


    Related Citations: 
    • Crystal Structures of Various Maltooligosaccharides Bound to Maltoporin Reveal a Specific Sugar Translocation Pathway
      Dutzler, R.,Wang, Y.F.,Rizkallah, P.,Rosenbusch, J.P.,Schirmer, T.
      (1996) Structure 4: 127
    • 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 Microbiology, Biozentrum, University of Basel, Basel, CH-4056, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MALTOPORIN
A, B, C
421Escherichia coli (strain K12)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
FRU
Query on FRU

Download SDF File 
Download CCD File 
A, B, C
FRUCTOSE
C6 H12 O6
RFSUNEUAIZKAJO-ARQDHWQXSA-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, C
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.195 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 129.660α = 90.00
b = 211.510β = 90.00
c = 217.910γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4model building
ROTAVATAdata reduction
CCP4phasing
PROLSQrefinement
CCP4data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-03-25
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance