Crystal structure of Aquaglyceroporin AQP7

Experimental Data Snapshot

  • Resolution: 4.00 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 

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This is version 1.4 of the entry. See complete history


Aquaporin-7: A Dynamic Aquaglyceroporin With Greater Water and Glycerol Permeability Than Its Bacterial Homolog GlpF.

Moss, F.J.Mahinthichaichan, P.Lodowski, D.T.Kowatz, T.Tajkhorshid, E.Engel, A.Boron, W.F.Vahedi-Faridi, A.

(2020) Front Physiol 11: 728-728

  • DOI: https://doi.org/10.3389/fphys.2020.00728
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Xenopus oocytes expressing human aquaporin-7 (AQP7) exhibit greater osmotic water permeability and 3 H-glycerol uptake vs. those expressing the bacterial glycerol facilitator GlpF. AQP7-expressing oocytes exposed to increasing extracellular [glycerol] under isosmolal conditions exhibit increasing swelling rates, whereas GlpF-expressing oocytes do not swell at all. To provide a structural basis for these observed physiological differences, we performed X-ray crystallographic structure determination of AQP7 and molecular-dynamics simulations on AQP7 and GlpF. The structure reveals AQP7 tetramers containing two monomers with 3 glycerols, and two monomers with 2 glycerols in the pore. In contrast to GlpF, no glycerol is bound at the AQP7 selectivity filter (SF), comprising residues F74, G222, Y223, and R229. The AQP7 SF is resolved in its closed state because F74 blocks the passage of small solutes. Molecular dynamics simulations demonstrate that F74 undergoes large and rapid conformational changes, allowing glycerol molecules to permeate without orientational restriction. The more rigid GlpF imposes orientational constraints on glycerol molecules passing through the SF. Moreover, GlpF-W48 (analogous to AQP7-F74) undergoes rare but long-lasting conformational changes that block the pore to H 2 O and glycerol.

  • Organizational Affiliation

    Department of Biochemistry, School of Medicine, Case Western Reserve University, Cleveland, OH, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
B [auth C],
C [auth B],
376Homo sapiensMutation(s): 0 
Gene Names: AQP7AQP7LAQP9
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O14520 (Homo sapiens)
Explore O14520 
Go to UniProtKB:  O14520
PHAROS:  O14520
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14520
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GOL

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth C]
H [auth C]
I [auth C]
E [auth A],
F [auth A],
G [auth C],
H [auth C],
I [auth C],
J [auth B],
K [auth B],
L [auth B],
M [auth D],
N [auth D],
O [auth D],
P [auth D]
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 4.00 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.233 
  • Space Group: F 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 385.658α = 90
b = 385.658β = 90
c = 385.658γ = 90
Software Package:
Software NamePurpose
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-11-13
    Type: Initial release
  • Version 1.1: 2020-02-12
    Changes: Data collection, Derived calculations
  • Version 1.2: 2020-07-08
    Changes: Database references
  • Version 1.3: 2020-08-05
    Changes: Database references
  • Version 1.4: 2023-10-11
    Changes: Advisory, Data collection, Database references, Refinement description