High-resolution structure of Pichia Pastoris aquaporin Aqy1 at 0.88 A

Experimental Data Snapshot

  • Resolution: 0.88 Å
  • R-Value Free: 0.107 
  • R-Value Work: 0.103 
  • R-Value Observed: 0.103 

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Subangstrom Resolution X-Ray Structure Details Aquaporin-Water Interactions

Kosinska-Eriksson, U.Fischer, G.Friemann, R.Enkavi, G.Tajkhorshid, E.Neutze, R.

(2013) Science 340: 1346

  • DOI: https://doi.org/10.1126/science.1234306
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Aquaporins are membrane channels that facilitate the flow of water across biological membranes. Two conserved regions are central for selective function: the dual asparagine-proline-alanine (NPA) aquaporin signature motif and the aromatic and arginine selectivity filter (SF). Here, we present the crystal structure of a yeast aquaporin at 0.88 angstrom resolution. We visualize the H-bond donor interactions of the NPA motif's asparagine residues to passing water molecules; observe a polarized water-water H-bond configuration within the channel; assign the tautomeric states of the SF histidine and arginine residues; and observe four SF water positions too closely spaced to be simultaneously occupied. Strongly correlated movements break the connectivity of SF waters to other water molecules within the channel and prevent proton transport via a Grotthuss mechanism.

  • Organizational Affiliation

    Department of Biochemistry, College of Medicine, Center for Biophysics and Computational Biology, and Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana, Illinois 61802, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AQUAPORIN279Komagataella pastorisMutation(s): 0 
Membrane Entity: Yes 
Find proteins for F2QVG4 (Komagataella phaffii (strain ATCC 76273 / CBS 7435 / CECT 11047 / NRRL Y-11430 / Wegner 21-1))
Explore F2QVG4 
Go to UniProtKB:  F2QVG4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF2QVG4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 0.88 Å
  • R-Value Free: 0.107 
  • R-Value Work: 0.103 
  • R-Value Observed: 0.103 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.763α = 90
b = 90.763β = 90
c = 80.311γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-06-26
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Derived calculations
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary