3GD8

Crystal Structure of Human Aquaporin 4 at 1.8 and its Mechanism of Conductance


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of human aquaporin 4 at 1.8 A and its mechanism of conductance.

Ho, J.D.Yeh, R.Sandstrom, A.Chorny, I.Harries, W.E.Robbins, R.A.Miercke, L.J.Stroud, R.M.

(2009) Proc.Natl.Acad.Sci.USA 106: 7437-7442

  • DOI: 10.1073/pnas.0902725106

  • PubMed Abstract: 
  • Aquaporin (AQP) 4 is the predominant water channel in the mammalian brain, abundantly expressed in the blood-brain and brain-cerebrospinal fluid interfaces of glial cells. Its function in cerebral water balance has implications in neuropathological d ...

    Aquaporin (AQP) 4 is the predominant water channel in the mammalian brain, abundantly expressed in the blood-brain and brain-cerebrospinal fluid interfaces of glial cells. Its function in cerebral water balance has implications in neuropathological disorders, including brain edema, stroke, and head injuries. The 1.8-A crystal structure reveals the molecular basis for the water selectivity of the channel. Unlike the case in the structures of water-selective AQPs AqpZ and AQP1, the asparagines of the 2 Asn-Pro-Ala motifs do not hydrogen bond to the same water molecule; instead, they bond to 2 different water molecules in the center of the channel. Molecular dynamics simulations were performed to ask how this observation bears on the proposed mechanisms for how AQPs remain totally insulating to any proton conductance while maintaining a single file of hydrogen bonded water molecules throughout the channel.


    Organizational Affiliation

    Graduate Program in Chemistry and Chemical Biology and Department of Biochemistry and Biophysics, Genentech Hall, University of California, 600 16th Street, San Francisco, CA 94158-2517, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aquaporin-4
A
223Homo sapiensMutation(s): 0 
Gene Names: AQP4
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Aquaporins and Glyceroporins
Protein: 
AQP4 aquaporin water channel
Find proteins for P55087 (Homo sapiens)
Go to Gene View: AQP4
Go to UniProtKB:  P55087
Small Molecules
Ligands 2 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
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: 1.8 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.160 
  • Space Group: P 4 21 2
Unit Cell:
Length (Å)Angle (°)
a = 82.058α = 90.00
b = 82.058β = 90.00
c = 76.353γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
Blu-Icedata collection
HKL-2000data reduction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance