1FQY

STRUCTURE OF AQUAPORIN-1 AT 3.8 A RESOLUTION BY ELECTRON CRYSTALLOGRAPHY

• PDB DOI: https://doi.org/10.2210/pdb1FQY/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMMemProtMD


• Deposited: 2000-09-07 Released: 2000-10-18 
• Deposition Author(s): Murata, K., Mitsuoka, K., Hirai, T., Walz, T., Agre, P., Heymann, J.B., Engel, A., Fujiyoshi, Y.

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Experimental Data Snapshot

• Method: ELECTRON CRYSTALLOGRAPHY
• Resolution: 3.80 Å
• R-Value Free: 0.417 
• R-Value Work: 0.399 
• R-Value Observed: 0.406 

Literature

Structural determinants of water permeation through aquaporin-1.

Murata, K., Mitsuoka, K., Hirai, T., Walz, T., Agre, P., Heymann, J.B., Engel, A., Fujiyoshi, Y.

(2000) Nature 407: 599-605

• PubMed: 11034202 
• DOI: https://doi.org/10.1038/35036519
• Primary Citation of Related Structures:  
  1FQY


• PubMed Abstract: 
  

  Human red cell AQP1 is the first functionally defined member of the aquaporin family of membrane water channels. Here we describe an atomic model of AQP1 at 3.8A resolution from electron crystallographic data. Multiple highly conserved amino-acid residues stabilize the novel fold of AQP1. The aqueous pathway is lined with conserved hydrophobic residues that permit rapid water transport, whereas the water selectivity is due to a constriction of the pore diameter to about 3 A over a span of one residue. The atomic model provides a possible molecular explanation to a longstanding puzzle in physiology-how membranes can be freely permeable to water but impermeable to protons.

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Organizational Affiliation: 

National Institute for Physiological Sciences, Okazaki, Japan.

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 28.55 kDa 
• Atom Count: 1,661 
• Modelled Residue Count: 226 
• Deposited Residue Count: 269 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
AQUAPORIN-1	A	269	Homo sapiens	Mutation(s): 0  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

Experimental Data & Validation

Experimental Data

• Method: ELECTRON CRYSTALLOGRAPHY
• Resolution: 3.80 Å
• R-Value Free: 0.417 
• R-Value Work: 0.399 
• R-Value Observed: 0.406 
• Space Group: P 4 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96	α = 90
b = 96	β = 90
c = 100	γ = 90

Software Package:

Software Name	Purpose
LATLINE	model building
X-PLOR	refinement
CCP4	data scaling
LATLINE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-10-18 
Deposition Author(s): Murata, K., Mitsuoka, K., Hirai, T., Walz, T., Agre, P., Heymann, J.B., Engel, A., Fujiyoshi, Y.

Revision History  

• Version 1.0: 2000-10-18
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 1.4: 2024-02-07
  Changes: Data collection, Database references
• Version 1.5: 2024-04-17
  Changes: Other