6OF9

Structure of the Chlamydamonas reinhardtii CamKII hub homology domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Variation in assembly stoichiometry in non-metazoan homologs of the hub domain of Ca2+/calmodulin-dependent protein kinase II.

McSpadden, E.D.Xia, Z.Chi, C.C.Susa, A.C.Shah, N.H.Gee, C.L.Williams, E.R.Kuriyan, J.

(2019) Protein Sci. 28: 1071-1082

  • DOI: 10.1002/pro.3614
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The multi-subunit Ca <sup>2+ </sup> /calmodulin-dependent protein kinase II (CaMKII) holoenzyme plays a critical role in animal learning and memory. The kinase domain of CaMKII is connected by a flexible linker to a C-terminal hub domain that assembl ...

    The multi-subunit Ca 2+ /calmodulin-dependent protein kinase II (CaMKII) holoenzyme plays a critical role in animal learning and memory. The kinase domain of CaMKII is connected by a flexible linker to a C-terminal hub domain that assembles into a 12- or 14-subunit scaffold that displays the kinase domains around it. Studies on CaMKII suggest that the stoichiometry and dynamic assembly/disassembly of hub oligomers may be important for CaMKII regulation. Although CaMKII is a metazoan protein, genes encoding predicted CaMKII-like hub domains, without associated kinase domains, are found in the genomes of some green plants and bacteria. We show that the hub domains encoded by three related green algae, Chlamydomonas reinhardtii, Volvox carteri f. nagarensis, and Gonium pectoral, assemble into 16-, 18-, and 20-subunit oligomers, as assayed by native protein mass spectrometry. These are the largest known CaMKII hub domain assemblies. A crystal structure of the hub domain from C. reinhardtii reveals an 18-subunit organization. We identified four intra-subunit hydrogen bonds in the core of the fold that are present in the Chlamydomonas hub domain, but not in metazoan hubs. When six point mutations designed to recapitulate these hydrogen bonds were introduced into the human CaMKII-α hub domain, the mutant protein formed assemblies with 14 and 16 subunits, instead of the normal 12- and 14-subunit assemblies. Our results show that the stoichiometric balance of CaMKII hub assemblies can be shifted readily by small changes in sequence.


    Organizational Affiliation

    Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California.,Department of Chemistry, University of California, Berkeley, California.,California Institute for Quantitative Biosciences (QB3), University of California, Berkeley, California.,Howard Hughes Medical Institute, University of California, Berkeley, California.,Department of Molecular and Cell Biology, University of California, Berkeley, California.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CaMKII hub
E, D, A, B, C, F, G, H, I
134Chlamydomonas reinhardtiiMutation(s): 0 
Find proteins for A0A2K3DJN8 (Chlamydomonas reinhardtii)
Go to UniProtKB:  A0A2K3DJN8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.221 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 126.464α = 90.00
b = 126.464β = 90.00
c = 372.436γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--
National Science Foundation (NSF, United States)United StatesCHE -1609866 (ERW)

Revision History 

  • Version 1.0: 2019-04-17
    Type: Initial release
  • Version 1.1: 2019-05-29
    Type: Data collection, Database references
  • Version 1.2: 2019-11-20
    Type: Author supporting evidence