5N8Y

KaiCBA circadian clock backbone model based on a Cryo-EM density


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of the cyanobacterial circadian oscillator frozen in a fully assembled state.

Snijder, J.Schuller, J.M.Wiegard, A.Lossl, P.Schmelling, N.Axmann, I.M.Plitzko, J.M.Forster, F.Heck, A.J.

(2017) Science 355: 1181-1184

  • DOI: 10.1126/science.aag3218

  • PubMed Abstract: 
  • Cyanobacteria have a robust circadian oscillator, known as the Kai system. Reconstituted from the purified protein components KaiC, KaiB, and KaiA, it can tick autonomously in the presence of adenosine 5'-triphosphate (ATP). The KaiC hexamers enter a ...

    Cyanobacteria have a robust circadian oscillator, known as the Kai system. Reconstituted from the purified protein components KaiC, KaiB, and KaiA, it can tick autonomously in the presence of adenosine 5'-triphosphate (ATP). The KaiC hexamers enter a natural 24-hour reaction cycle of autophosphorylation and assembly with KaiB and KaiA in numerous diverse forms. We describe the preparation of stoichiometrically well-defined assemblies of KaiCB and KaiCBA, as monitored by native mass spectrometry, allowing for a structural characterization by single-particle cryo-electron microscopy and mass spectrometry. Our data reveal details of the interactions between the Kai proteins and provide a structural basis to understand periodic assembly of the protein oscillator.


    Organizational Affiliation

    Biomolecular Mass Spectrometry and Proteomics and Netherlands Proteomics Center, Bijvoet Center for Biomolecular Research, and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH, Utrecht, Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein kinase KaiC
A, B, C, D, E, F
519Synechococcus elongatus (strain PCC 7942)Gene Names: kaiC
EC: 2.7.11.1
Find proteins for Q79PF4 (Synechococcus elongatus (strain PCC 7942))
Go to UniProtKB:  Q79PF4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein KaiB
G, H, K, J, I, L
102Synechococcus elongatus (strain PCC 7942)Gene Names: kaiB
Find proteins for Q79PF5 (Synechococcus elongatus (strain PCC 7942))
Go to UniProtKB:  Q79PF5
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein KaiA
M, N, O, P, Q, R, S, T, U, V, W, X
284Synechococcus elongatus (strain PCC 7942)Gene Names: kaiA
Find proteins for Q79PF6 (Synechococcus elongatus (strain PCC 7942))
Go to UniProtKB:  Q79PF6
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.7 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: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-08-30
    Type: Data collection