3GD8

Crystal Structure of Human Aquaporin 4 at 1.8 and its Mechanism of Conductance


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.160 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of human aquaporin 4 at 1.8 A and its mechanism of conductance.

Ho, J.D.Yeh, R.Sandstrom, A.Chorny, I.Harries, W.E.Robbins, R.A.Miercke, L.J.Stroud, R.M.

(2009) Proc Natl Acad Sci U S A 106: 7437-7442

  • DOI: 10.1073/pnas.0902725106
  • Primary Citation of Related Structures:  
    3GD8

  • PubMed Abstract: 
  • Aquaporin (AQP) 4 is the predominant water channel in the mammalian brain, abundantly expressed in the blood-brain and brain-cerebrospinal fluid interfaces of glial cells. Its function in cerebral water balance has implications in neuropathological disorders, including brain edema, stroke, and head injuries ...

    Aquaporin (AQP) 4 is the predominant water channel in the mammalian brain, abundantly expressed in the blood-brain and brain-cerebrospinal fluid interfaces of glial cells. Its function in cerebral water balance has implications in neuropathological disorders, including brain edema, stroke, and head injuries. The 1.8-A crystal structure reveals the molecular basis for the water selectivity of the channel. Unlike the case in the structures of water-selective AQPs AqpZ and AQP1, the asparagines of the 2 Asn-Pro-Ala motifs do not hydrogen bond to the same water molecule; instead, they bond to 2 different water molecules in the center of the channel. Molecular dynamics simulations were performed to ask how this observation bears on the proposed mechanisms for how AQPs remain totally insulating to any proton conductance while maintaining a single file of hydrogen bonded water molecules throughout the channel.


    Organizational Affiliation

    Graduate Program in Chemistry and Chemical Biology and Department of Biochemistry and Biophysics, Genentech Hall, University of California, 600 16th Street, San Francisco, CA 94158-2517, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aquaporin-4A223Homo sapiensMutation(s): 0 
Gene Names: AQP4
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Aquaporins and Glyceroporins
Protein: 
AQP4 aquaporin water channel
Find proteins for P55087 (Homo sapiens)
Explore P55087 
Go to UniProtKB:  P55087
NIH Common Fund Data Resources
PHAROS:  P55087
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.165 
  • R-Value Work: 0.160 
  • R-Value Observed: 0.160 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.058α = 90
b = 82.058β = 90
c = 76.353γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-31
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary