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

    Cryo-electron Microscopy, Bijvoet Center for Biomolecular Research, 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
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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
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  • 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