6POJ

STRUCTURAL REFINEMENT OF AQUAPORIN 1 VIA SSNMR


Experimental Data Snapshot

  • Method: SOLID-STATE NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure of the Functionally Important Extracellular Loop C of Human Aquaporin 1 Obtained by Solid-State NMR under Nearly Physiological Conditions.

Dingwell, D.A.Brown, L.S.Ladizhansky, V.

(2019) J Phys Chem B 123: 7700-7710

  • DOI: https://doi.org/10.1021/acs.jpcb.9b06430
  • Primary Citation of Related Structures:  
    6POJ

  • PubMed Abstract: 

    Human aquaporin 1 (hAQP1) is the first discovered selective water channel present in lipid membranes of multiple types of cells. Several structures of hAQP1 and its bovine homolog have been obtained by electron microscopy and X-ray crystallography, giving a consistent picture of the transmembrane domain with the water-conducting pore. The transmembrane domain is formed by six full helices and two half-helices, which form a central constriction with conserved asparagine-proline-alanine motifs. Another constriction, the aromatic/arginine (ar/R) filter, is found close to the extracellular surface, and includes aromatic residues and a conserved arginine (Arg-195). Although the existing crystal structures largely converge on the location of helical segments, they differ in details of conformation of the longest extracellular loop C and its interactions with the ar/R filter (in particular, with Arg-195). Here, we use solid-state nuclear magnetic resonance to determine multiple interatomic distances, and come up with a refined structural model for hAQP1, which represents a physiologically relevant state predominant at noncryogenic temperatures in a lipid environment. The model clearly disambiguates the position of the Arg-195 sidechain disputed previously and shows a number of interactions for loop C, both with the ar/R filter and a number of other residues on the extracellular side of hAQP1.


  • Organizational Affiliation

    Department of Physics and Biophysics Interdepartmental Group , University of Guelph , 50 Stone Road E , Guelph , Ontario N1G 2W1 , Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Aquaporin-1292Homo sapiensMutation(s): 0 
Gene Names: AQP1CHIP28
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P29972 (Homo sapiens)
Explore P29972 
Go to UniProtKB:  P29972
PHAROS:  P29972
GTEx:  ENSG00000240583 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29972
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLID-STATE NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN-2014-04547
Natural Sciences and Engineering Research Council (NSERC, Canada)CanadaRGPIN-2018-04397

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-02
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.2: 2023-06-14
    Changes: Database references, Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references