5IG3

Crystal structure of the human CaMKII-alpha hub


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular mechanism of activation-triggered subunit exchange in Ca(2+)/calmodulin-dependent protein kinase II.

Bhattacharyya, M.Stratton, M.M.Going, C.C.McSpadden, E.D.Huang, Y.Susa, A.C.Elleman, A.Cao, Y.M.Pappireddi, N.Burkhardt, P.Gee, C.L.Barros, T.Schulman, H.Williams, E.R.Kuriyan, J.

(2016) Elife 5: --

  • DOI: 10.7554/eLife.13405
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Activation triggers the exchange of subunits in Ca(2+)/calmodulin-dependent protein kinase II (CaMKII), an oligomeric enzyme that is critical for learning, memory, and cardiac function. The mechanism by which subunit exchange occurs remains elusive. ...

    Activation triggers the exchange of subunits in Ca(2+)/calmodulin-dependent protein kinase II (CaMKII), an oligomeric enzyme that is critical for learning, memory, and cardiac function. The mechanism by which subunit exchange occurs remains elusive. We show that the human CaMKII holoenzyme exists in dodecameric and tetradecameric forms, and that the calmodulin (CaM)-binding element of CaMKII can bind to the hub of the holoenzyme and destabilize it to release dimers. The structures of CaMKII from two distantly diverged organisms suggest that the CaM-binding element of activated CaMKII acts as a wedge by docking at intersubunit interfaces in the hub. This converts the hub into a spiral form that can release or gain CaMKII dimers. Our data reveal a three-way competition for the CaM-binding element, whereby phosphorylation biases it towards the hub interface, away from the kinase domain and calmodulin, thus unlocking the ability of activated CaMKII holoenzymes to exchange dimers with unactivated ones.


    Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calcium/calmodulin-dependent protein kinase type II subunit alpha
A, B, C, D, E, F
153Homo sapiensMutation(s): 0 
Gene Names: CAMK2A (CAMKA, KIAA0968)
EC: 2.7.11.17
Find proteins for Q9UQM7 (Homo sapiens)
Go to Gene View: CAMK2A
Go to UniProtKB:  Q9UQM7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.220 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 89.888α = 90.00
b = 89.888β = 90.00
c = 226.577γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical InstituteUnited StatesNA

Revision History 

  • Version 1.0: 2016-03-23
    Type: Initial release
  • Version 1.1: 2016-04-06
    Type: Structure summary
  • Version 1.2: 2016-07-13
    Type: Data collection
  • Version 1.3: 2017-09-27
    Type: Author supporting evidence, Derived calculations