2C32

Co-axial association of recombinant eye lens aquaporin-0 observed in loosely packed 3D-crystals


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.01 Å
  • R-Value Free: 0.387 
  • R-Value Work: 0.390 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Co-Axial Association of Recombinant Eye Lens Aquaporin-0 Observed in Loosely Packed 3D-Crystals

Palanivelu, D.V.Kozono, D.E.Engel, A.Suda, K.Lustig, A.Agre, P.Schirmer, T.

(2006) J.Mol.Biol. 355: 605

  • DOI: 10.1016/j.jmb.2005.10.032

  • PubMed Abstract: 
  • Aquaporin-0 (AQP0) is the major membrane protein in vertebrate eye lenses. It has been proposed that AQP0 tetramers mediate contact between membranes of adjacent lens fiber cells, which would be consistent with the extraordinarily narrow inter-cellul ...

    Aquaporin-0 (AQP0) is the major membrane protein in vertebrate eye lenses. It has been proposed that AQP0 tetramers mediate contact between membranes of adjacent lens fiber cells, which would be consistent with the extraordinarily narrow inter-cellular spacing. We have obtained 3D crystals of recombinant bovine AQP0 that diffract to 7.0 A resolution. The crystal packing was determined by molecular replacement and shows that, within the cubic lattice, AQP0 tetramers are associated head-to-head along their 4-fold axes. Oligomeric states larger than the tetramer were also observed in solution by native gel electrophoresis and analytical ultracentrifugation methods. In the crystals, there are no direct contacts between octamers, and it can thus be inferred that crystalline order is mediated solely by the detergent belts surrounding the membrane protein. Across the tetramer-tetramer interface, extracellular loops A and C interdigitate at the center and the perimeter of the octamer, respectively. The octamer structure is compared with that of the recently determined structure of truncated ovine AQP0 derived from electron diffraction of 2D crystals. Intriguingly, also in these crystals, octamers are observed, but with significantly different relative tetramer-tetramer orientations. The interactions observed in the loosely packed 3D crystals reported here may in fact represent an in vivo association mode between AQP0 tetramers from juxtaposed membranes in the eye lens.


    Organizational Affiliation

    Division of Structural Biology, Biozentrum, University of Basel, Klingelbergstr. 70, CH-4056 Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LENS FIBER MAJOR INTRINSIC PROTEIN
A
263Bos taurusMutation(s): 0 
Gene Names: MIP
Find proteins for P06624 (Bos taurus)
Go to Gene View: MIP
Go to UniProtKB:  P06624
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 7.01 Å
  • R-Value Free: 0.387 
  • R-Value Work: 0.390 
  • Space Group: I 4 3 2
Unit Cell:
Length (Å)Angle (°)
a = 188.271α = 90.00
b = 188.271β = 90.00
c = 188.271γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
AMoREphasing
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-12-07
    Type: Initial release
  • Version 1.1: 2011-05-07
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance