1RC2

2.5 Angstrom Resolution X-ray Structure of Aquaporin Z


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Architecture and selectivity in aquaporins: 2.5 a X-ray structure of aquaporin Z

Savage, D.F.Egea, P.F.Robles-Colmenares, Y.O'Connell III, J.D.Stroud, R.M.

(2003) Plos Biol. 1: 334-340

  • DOI: 10.1371/journal.pbio.0000072

  • PubMed Abstract: 
  • Aquaporins are a family of water and small molecule channels found in organisms ranging from bacteria to animals. One of these channels, the E. coli protein aquaporin Z (AqpZ), has been shown to selectively conduct only water at high rates. We have e ...

    Aquaporins are a family of water and small molecule channels found in organisms ranging from bacteria to animals. One of these channels, the E. coli protein aquaporin Z (AqpZ), has been shown to selectively conduct only water at high rates. We have expressed, purified, crystallized, and solved the X-ray structure of AqpZ. The 2.5 A resolution structure of AqpZ suggests aquaporin selectivity results both from a steric mechanism due to pore size and from specific amino acid substitutions that regulate the preference for a hydrophobic or hydrophilic substrate. This structure provides direct evidence on the molecular mechanisms of specificity between water and glycerol in this family of channels from a single species. It is to our knowledge the first atomic resolution structure of a recombinant aquaporin and so provides a platform for combined genetic, mutational, functional, and structural determinations of the mechanisms of aquaporins and, more generally, the assembly of multimeric membrane proteins.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of California School of Medicine, San Francisco, California, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aquaporin Z
B, A
231Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: aqpZ (bniP)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Aquaporins and Glyceroporins
Protein: 
AqpZ aquaporin water channel
Find proteins for P60844 (Escherichia coli (strain K12))
Go to UniProtKB:  P60844
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGL
Query on BGL

Download SDF File 
Download CCD File 
B
B-2-OCTYLGLUCOSIDE
C14 H28 O6
BVHPDIWLWHHJPD-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 
  • Space Group: P 4
Unit Cell:
Length (Å)Angle (°)
a = 93.550α = 90.00
b = 93.550β = 90.00
c = 80.380γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
CNSphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance