3J41

Pseudo-atomic model of the Aquaporin-0/Calmodulin complex derived from electron microscopy


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 25 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Allosteric mechanism of water-channel gating by Ca(2+)-calmodulin.

Reichow, S.L.Clemens, D.M.Freites, J.A.Nemeth-Cahalan, K.L.Heyden, M.Tobias, D.J.Hall, J.E.Gonen, T.

(2013) Nat.Struct.Mol.Biol. 20: 1085-1092

  • DOI: 10.1038/nsmb.2630

  • PubMed Abstract: 
  • Calmodulin (CaM) is a universal regulatory protein that communicates the presence of calcium to its molecular targets and correspondingly modulates their function. This key signaling protein is important for controlling the activity of hundreds of me ...

    Calmodulin (CaM) is a universal regulatory protein that communicates the presence of calcium to its molecular targets and correspondingly modulates their function. This key signaling protein is important for controlling the activity of hundreds of membrane channels and transporters. However, understanding of the structural mechanisms driving CaM regulation of full-length membrane proteins has remained elusive. In this study, we determined the pseudoatomic structure of full-length mammalian aquaporin-0 (AQP0, Bos taurus) in complex with CaM, using EM to elucidate how this signaling protein modulates water-channel function. Molecular dynamics and functional mutation studies reveal how CaM binding inhibits AQP0 water permeability by allosterically closing the cytoplasmic gate of AQP0. Our mechanistic model provides new insight, only possible in the context of the fully assembled channel, into how CaM regulates multimeric channels by facilitating cooperativity between adjacent subunits.


    Organizational Affiliation

    1] Howard Hughes Medical Institute, Janelia Farm Research Campus, Ashburn, Virginia, USA. [2].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lens fiber major intrinsic protein
A, B, C, D
263Ovis ariesMutation(s): 0 
Gene Names: MIP (AQP0)
Find proteins for Q6J8I9 (Ovis aries)
Go to Gene View: MIP
Go to UniProtKB:  Q6J8I9
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
E, F
149Homo sapiensMutation(s): 0 
Gene Names: CALM2 (CAM2, CAMB)
Find proteins for P0DP24 (Homo sapiens)
Go to Gene View: CALM2
Go to UniProtKB:  P0DP24
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
E, F
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 25 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-31
    Type: Initial release
  • Version 1.1: 2013-08-14
    Type: Database references
  • Version 1.2: 2013-09-18
    Type: Database references
  • Version 1.3: 2018-07-18
    Type: Data collection