1RC2

2.5 Angstrom Resolution X-ray Structure of Aquaporin Z


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 

wwPDB Validation   3D Report Full Report


This is version 1.3 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
  • Primary Citation of Related Structures:  
    1RC2

  • 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 expressed, purified, crystallized, and solved the X-ray structure of AqpZ ...

    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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aquaporin ZB [auth A], A [auth B]231Escherichia coliMutation(s): 0 
Gene Names: aqpZbniPb0875C1009SF0832S0873
Membrane Entity: Yes 
UniProt
Find proteins for P60844 (Escherichia coli (strain K12))
Explore P60844 
Go to UniProtKB:  P60844
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGL (Subject of Investigation/LOI)
Query on BGL

Download Ideal Coordinates CCD File 
C [auth B], D [auth B], E [auth B], F [auth B]2-O-octyl-beta-D-glucopyranose
C14 H28 O6
BVHPDIWLWHHJPD-RKQHYHRCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.227 
  • Space Group: P 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 93.55α = 90
b = 93.55β = 90
c = 80.38γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-11-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary