5N8Y

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.70 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

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: https://doi.org/10.1126/science.aag3218
  • Primary Citation of Related Structures:  
    5N8Y

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Circadian clock protein kinase KaiC
A, B, C, D, E
A, B, C, D, E, F
519Synechococcus elongatusMutation(s): 0 
Gene Names: kaiCSynpcc7942_1216see0011
EC: 2.7.11.1
UniProt
Find proteins for Q79PF4 (Synechococcus elongatus (strain ATCC 33912 / PCC 7942 / FACHB-805))
Explore Q79PF4 
Go to UniProtKB:  Q79PF4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ79PF4
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Circadian clock protein KaiB102Synechococcus elongatusMutation(s): 0 
Gene Names: kaiBSynpcc7942_1217see0010
UniProt
Find proteins for Q79PF5 (Synechococcus elongatus (strain ATCC 33912 / PCC 7942 / FACHB-805))
Explore Q79PF5 
Go to UniProtKB:  Q79PF5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ79PF5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Circadian clock protein KaiA
M, N, O, P, Q
M, N, O, P, Q, R, S, T, U, V, W, X
284Synechococcus elongatusMutation(s): 0 
Gene Names: kaiASynpcc7942_1218see0009
UniProt
Find proteins for Q79PF6 (Synechococcus elongatus (strain ATCC 33912 / PCC 7942 / FACHB-805))
Explore Q79PF6 
Go to UniProtKB:  Q79PF6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ79PF6
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-08-30
    Changes: Data collection
  • Version 1.2: 2018-10-24
    Changes: Advisory, Data collection, Derived calculations
  • Version 1.3: 2019-10-23
    Changes: Data collection, Other