5C5X

CRYSTAL STRUCTURE OF THE S156E MUTANT OF HUMAN AQUAPORIN 5


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history


Literature

Plasma Membrane Abundance of Human Aquaporin 5 Is Dynamically Regulated by Multiple Pathways.

Kitchen, P.Oberg, F.Sjohamn, J.Hedfalk, K.Bill, R.M.Conner, A.C.Conner, M.T.Tornroth-Horsefield, S.

(2015) PLoS One 10: e0143027-e0143027

  • DOI: 10.1371/journal.pone.0143027
  • Primary Citation of Related Structures:  
    5DYE, 5C5X

  • PubMed Abstract: 
  • Aquaporin membrane protein channels mediate cellular water flow. Human aquaporin 5 (AQP5) is highly expressed in the respiratory system and secretory glands where it facilitates the osmotically-driven generation of pulmonary secretions, saliva, sweat and tears ...

    Aquaporin membrane protein channels mediate cellular water flow. Human aquaporin 5 (AQP5) is highly expressed in the respiratory system and secretory glands where it facilitates the osmotically-driven generation of pulmonary secretions, saliva, sweat and tears. Dysfunctional trafficking of AQP5 has been implicated in several human disease states, including Sjögren's syndrome, bronchitis and cystic fibrosis. In order to investigate how the plasma membrane expression levels of AQP5 are regulated, we studied real-time translocation of GFP-tagged AQP5 in HEK293 cells. We show that AQP5 plasma membrane abundance in transfected HEK293 cells is rapidly and reversibly regulated by at least three independent mechanisms involving phosphorylation at Ser156, protein kinase A activity and extracellular tonicity. The crystal structure of a Ser156 phosphomimetic mutant indicates that its involvement in regulating AQP5 membrane abundance is not mediated by a conformational change of the carboxy-terminus. We suggest that together these pathways regulate cellular water flow.


    Organizational Affiliation

    Department of Biochemistry and Structural Biology, Centre for Molecular Protein Science, Lund University, Lund, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Aquaporin-5A, B, C, D, E, F, G, H245Homo sapiensMutation(s): 1 
Gene Names: AQP5
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P55064 (Homo sapiens)
Explore P55064 
Go to UniProtKB:  P55064
PHAROS:  P55064
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PS6
Query on PS6

Download Ideal Coordinates CCD File 
I [auth D], J [auth H]O-[(S)-{[(2S)-2-(hexanoyloxy)-3-(tetradecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-D-serine
C26 H50 N O10 P
HXSPCZGHXODQMW-XZOQPEGZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.195 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 170.75α = 90
b = 170.75β = 90
c = 189.671γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden0114 225 3004
Swedish Research CouncilSweden2010-5208

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-02
    Type: Initial release