1LDF

CRYSTAL STRUCTURE OF THE E. COLI GLYCEROL FACILITATOR (GLPF) MUTATION W48F, F200T


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Control of the selectivity of the aquaporin water channel family by global orientational tuning.

Tajkhorshid, E.Nollert, P.Jensen, M.O.Miercke, L.J.O'Connell, J.Stroud, R.M.Schulten, K.

(2002) Science 296: 525-530

  • DOI: 10.1126/science.1067778
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Aquaporins are transmembrane channels found in cell membranes of all life forms. We examine their apparently paradoxical property, facilitation of efficient permeation of water while excluding protons, which is of critical importance to preserving th ...

    Aquaporins are transmembrane channels found in cell membranes of all life forms. We examine their apparently paradoxical property, facilitation of efficient permeation of water while excluding protons, which is of critical importance to preserving the electrochemical potential across the cell membrane. We have determined the structure of the Escherichia coli aquaglyceroporin GlpF with bound water, in native (2.7 angstroms) and in W48F/F200T mutant (2.1 angstroms) forms, and carried out 12-nanosecond molecular dynamics simulations that define the spatial and temporal probability distribution and orientation of a single file of seven to nine water molecules inside the channel. Two conserved asparagines force a central water molecule to serve strictly as a hydrogen bond donor to its neighboring water molecules. Assisted by the electrostatic potential generated by two half-membrane spanning loops, this dictates opposite orientations of water molecules in the two halves of the channel, and thus prevents the formation of a "proton wire," while permitting rapid water diffusion. Both simulations and observations revealed a more regular distribution of channel water and an increased water permeability for the W48F/F200T mutant.


    Related Citations: 
    • Structure of a Glycerol-Conducting Channel and the Basis for Its Selectivity
      Fu, D.,Libson, A.,Miercke, L.J.,Weitzman, C.,Nollert, P.,Krucinski, J.,Stroud, R.M.
      (2000) Science 290: 481


    Organizational Affiliation

    Theoretical Biophysics Group, Beckman Institute, University of Illinois at Urbana-Champaign, 405 North Mathews, Urbana, IL 61801, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glycerol uptake facilitator protein
A
281Escherichia coli (strain K12)Mutation(s): 2 
Gene Names: glpF
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Aquaporins and Glyceroporins
Protein: 
GlpF glycerol facilitator channel
Find proteins for P0AER0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AER0
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
BOG
Query on BOG

Download SDF File 
Download CCD File 
A
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.230 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 96.925α = 90.00
b = 96.925β = 90.00
c = 185.433γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
CNSphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-05-08
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance