2D57

Double layered 2D crystal structure of AQUAPORIN-4 (AQP4M23) at 3.2 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 1.3 of the entry. See complete history

Literature

Implications of the Aquaporin-4 Structure on Array Formation and Cell Adhesion

Hiroaki, Y.Tani, K.Kamegawa, A.Gyobu, N.Nishikawa, K.Suzuki, H.Walz, T.Sasaki, S.Mitsuoka, K.Kimura, K.Mizoguchi, A.Fujiyoshi, Y.

(2005) J.Mol.Biol. 355: 628-639

  • DOI: 10.1016/j.jmb.2005.10.081

  • PubMed Abstract: 
  • Aquaporin-4 (AQP4) is the predominant water channel in the mammalian brain and an important drug target for treatment of cerebral edema, bipolar disorder and mesial temporal lobe epilepsy. We determined the AQP4 structure by electron crystallography ...

    Aquaporin-4 (AQP4) is the predominant water channel in the mammalian brain and an important drug target for treatment of cerebral edema, bipolar disorder and mesial temporal lobe epilepsy. We determined the AQP4 structure by electron crystallography of double-layered, two-dimensional (2D) crystals. The structure allows us to discuss how the expression ratio between the long and short AQP4 splicing variant can determine the size of in vivo orthogonal arrays. Furthermore, AQP4 contains a short 3(10) helix in an extracellular loop, which mediates weak but specific interactions between AQP4 molecules in adjoining membranes. This finding suggests a previously unexpected role for AQP4 in cell adhesion. This notion was corroborated by expression of AQP4 in L-cells, which resulted in clustering of the cells. Our AQP4 structure thus enables us to propose models for the size regulation of orthogonal arrays and channel-mediated cell adhesion.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aquaporin-4
A
301Rattus norvegicusMutation(s): 0 
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
Experimental Data & Validation

Experimental Data

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

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-31
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2018-07-18
    Type: Author supporting evidence, Data collection, Database references