Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Predict Membrane 

Global Symmetry: Cyclic - C4  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 28.24 kDa 
• Atom Count: 2111 
• Modelled Residue Count: 261 
• Deposited Residue Count: 263 
• Unique protein chains: 1

2B6P

X-ray structure of lens Aquaporin-0 (AQP0) (lens MIP) in an open pore state

• PDB DOI: 10.2210/pdb2B6P/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Bos taurus
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2005-10-03 Released: 2005-12-06 
• Deposition Author(s): Gonen, T., Cheng, Y., Sliz, P., Hiroaki, Y., Fujiyoshi, Y., Harrison, S.C., Walz, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.292 
• R-Value Work: 0.242 

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 1YMG

Literature

Lipid-protein interactions in double-layered two-dimensional AQP0 crystals.

Gonen, T., Cheng, Y., Sliz, P., Hiroaki, Y., Fujiyoshi, Y., Harrison, S.C., Walz, T.

(2005) Nature 438: 633-638

• PubMed: 16319884 
• DOI: 10.1038/nature04321
• Primary Citation of Related Structures:  
  2B6O, 2B6P


• PubMed Abstract: 
  

Lens-specific aquaporin-0 (AQP0) functions as a specific water pore and forms the thin junctions between fibre cells. Here we describe a 1.9 A resolution structure of junctional AQP0, determined by electron crystallography of double-layered two-dimensional crystals. Comparison of junctional and non-junctional AQP0 structures shows that junction formation depends on a conformational switch in an extracellular loop, which may result from cleavage of the cytoplasmic amino and carboxy termini. In the centre of the water pathway, the closed pore in junctional AQP0 retains only three water molecules, which are too widely spaced to form hydrogen bonds with each other. Packing interactions between AQP0 tetramers in the crystalline array are mediated by lipid molecules, which assume preferred conformations. We were therefore able to build an atomic model for the lipid bilayer surrounding the AQP0 tetramers, and we describe lipid-protein interactions.

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Related Citations: 

• The Channel Architecture Of Aquaporin O At 2.2 Angstrom Resolution
  Harries, W.E.C., Akhavan, D., Miercke, L.J.W., Khademi, S., Stroud, R.M.
  (2004) Proc Natl Acad Sci U S A 101: 14045

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Organizational Affiliation: 

Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Lens fiber major intrinsic protein	A	263	Bos taurus	Mutation(s): 0  Gene Names: MIP Membrane Entity: Yes
UniProt
Find proteins for P06624 (Bos taurus) Explore P06624  Go to UniProtKB:  P06624

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.292 
• R-Value Work: 0.242 
• Space Group: P 4 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 109.531	α = 90
b = 109.531	β = 90
c = 52.822	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-10-03 
• Released Date: 2005-12-06 
Deposition Author(s): Gonen, T., Cheng, Y., Sliz, P., Hiroaki, Y., Fujiyoshi, Y., Harrison, S.C., Walz, T.

Revision History  

• Version 1.0: 2005-12-06
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2011-10-26
  Changes: Other