2ZZ9

Structure of aquaporin-4 S180D mutant at 2.8 A resolution by electron crystallography


Experimental Data Snapshot

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanism of Aquaporin-4's Fast and Highly Selective Water Conduction and Proton Exclusion.

Tani, K.Mitsuma, T.Hiroaki, Y.Kamegawa, A.Nishikawa, K.Tanimura, Y.Fujiyoshi, Y.

(2009) J.Mol.Biol. 389: 694-706

  • DOI: 10.1016/j.jmb.2009.04.049

  • PubMed Abstract: 
  • Members of the aquaporin (AQP) family are expressed in almost every organism, including 13 homologues in humans. Based on the electron crystallographic structure of AQP1, the hydrogen-bond isolation mechanism was proposed to explain why AQPs are impe ...

    Members of the aquaporin (AQP) family are expressed in almost every organism, including 13 homologues in humans. Based on the electron crystallographic structure of AQP1, the hydrogen-bond isolation mechanism was proposed to explain why AQPs are impermeable to protons despite their very fast water conduction. The mechanism by which AQPs exclude protons remained controversial, however. Here we present the structure of AQP4 at 2.8 A resolution obtained by electron crystallography of double-layered two-dimensional crystals. The resolution has been improved from the previous 3.2 A, with accompanying improvement in data quality resulting in the ability to identify individual water molecules. Our structure of AQP4, the predominant water channel in the brain, reveals eight water molecules in the channel. The arrangement of the waters provides support for the hydrogen-bond isolation mechanism. Our AQP4 structure also visualizes five lipids, showing that direct interactions of the extracellular surface of AQP4 with three lipids in the adjoining membrane help stabilize the membrane junction.


    Organizational Affiliation

    Department of Biophysics, Faculty of Science, Kyoto University, Oiwake, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aquaporin-4
A
301Rattus norvegicusMutation(s): 1 
Gene Names: Aqp4
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Aquaporins and Glyceroporins
Protein: 
AQP4 aquaporin rat glial cell water channel
Find proteins for P47863 (Rattus norvegicus)
Go to UniProtKB:  P47863
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEE
Query on PEE

Download SDF File 
Download CCD File 
A
1,2-Dioleoyl-sn-glycero-3-phosphoethanolamine
DOPE
C41 H83 N O8 P
LVNGJLRDBYCPGB-LDLOPFEMSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON CRYSTALLOGRAPHY
  • Aggregation State: 2D ARRAY 
  • Reconstruction Method: CRYSTALLOGRAPHY 
Software Package:
Software NamePurpose
MRCdata collection
MRCdata reduction
REFMACrefinement
CNSphasing
MRCdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2014-10-29
    Type: Non-polymer description