5JWR

Crystal structure of foldswitch-stabilized KaiB in complex with the N-terminal CI domain of KaiC and a dimer of KaiA C-terminal domains from Thermosynechococcus elongatus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis of the day-night transition in a bacterial circadian clock.

Tseng, R.Goularte, N.F.Chavan, A.Luu, J.Cohen, S.E.Chang, Y.G.Heisler, J.Li, S.Michael, A.K.Tripathi, S.Golden, S.S.LiWang, A.Partch, C.L.

(2017) Science 355: 1174-1180

  • DOI: 10.1126/science.aag2516
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Circadian clocks are ubiquitous timing systems that induce rhythms of biological activities in synchrony with night and day. In cyanobacteria, timing is generated by a posttranslational clock consisting of KaiA, KaiB, and KaiC proteins and a set of o ...

    Circadian clocks are ubiquitous timing systems that induce rhythms of biological activities in synchrony with night and day. In cyanobacteria, timing is generated by a posttranslational clock consisting of KaiA, KaiB, and KaiC proteins and a set of output signaling proteins, SasA and CikA, which transduce this rhythm to control gene expression. Here, we describe crystal and nuclear magnetic resonance structures of KaiB-KaiC,KaiA-KaiB-KaiC, and CikA-KaiB complexes. They reveal how the metamorphic properties of KaiB, a protein that adopts two distinct folds, and the post-adenosine triphosphate hydrolysis state of KaiC create a hub around which nighttime signaling events revolve, including inactivation of KaiA and reciprocal regulation of the mutually antagonistic signaling proteins, SasA and CikA.


    Organizational Affiliation

    School of Natural Sciences, University of California, Merced, CA 95343, USA.,Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.,Quantitative and Systems Biology, University of California, Merced, CA 95343, USA.,Quantitative and Systems Biology, University of California, Merced, CA 95343, USA. aliwang@ucmerced.edu cpartch@ucsc.edu.,Center for Circadian Biology, University of California, San Diego, La Jolla, CA 92093, USA.,Chemistry and Chemical Biology, University of California, Merced, CA 95343, USA.,Health Sciences Research Institute, University of California, Merced, CA 95343, USA.,Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA. aliwang@ucmerced.edu cpartch@ucsc.edu.,Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064, USA.,Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein kinase KaiC
A, C
247Thermosynechococcus elongatus (strain BP-1)Mutation(s): 2 
Gene Names: kaiC
EC: 2.7.11.1
Find proteins for Q79V60 (Thermosynechococcus elongatus (strain BP-1))
Go to UniProtKB:  Q79V60
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein KaiB
B, D
99Thermosynechococcus elongatus (strain BP-1)Mutation(s): 4 
Gene Names: kaiB
Find proteins for Q79V61 (Thermosynechococcus elongatus (strain BP-1))
Go to UniProtKB:  Q79V61
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein KaiA
E, F, G, H
145Thermosynechococcus elongatus (strain BP-1)Mutation(s): 1 
Gene Names: kaiA
Find proteins for Q79V62 (Thermosynechococcus elongatus (strain BP-1))
Go to UniProtKB:  Q79V62
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, C
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.61 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.185 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 74.595α = 107.27
b = 79.105β = 90.71
c = 80.838γ = 111.20
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
PHASERphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM107521
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM107069

Revision History 

  • Version 1.0: 2017-03-29
    Type: Initial release
  • Version 1.1: 2017-09-20
    Type: Author supporting evidence