5C5E

Structure of KaiA dimer in complex with C-terminal KaiC peptide at 2.8 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Protein-Protein Interactions in the Cyanobacterial Circadian Clock: Structure of KaiA Dimer in Complex with C-Terminal KaiC Peptides at 2.8 angstrom Resolution.

Pattanayek, R.Egli, M.

(2015) Biochemistry 54: 4575-4578

  • DOI: 10.1021/acs.biochem.5b00694

  • PubMed Abstract: 
  • In the cyanobacterial circadian clock, the KaiA, -B, and -C proteins with ATP constitute a post-translational oscillator. KaiA stimulates the KaiC autokinase, and KaiB antagonizes KaiA action. KaiA contacts the intrinsically disordered C-terminal reg ...

    In the cyanobacterial circadian clock, the KaiA, -B, and -C proteins with ATP constitute a post-translational oscillator. KaiA stimulates the KaiC autokinase, and KaiB antagonizes KaiA action. KaiA contacts the intrinsically disordered C-terminal regions of KaiC hexamer to promote phosphorylation across subunit interfaces. The crystal structure of KaiA dimer from Synechococcus elongatus with two KaiC C-terminal 20mer peptides bound reveals that the latter adopt an α-helical conformation and contact KaiA α-helical bundles via mostly hydrophobic interactions. This complex and the crystal structure of KaiC hexamer with truncated C-terminal tails can be fit into the electron microscopy (EM) density of the KaiA:KaiC complex. The hybrid model helps rationalize clock phenotypes of KaiA and KaiC mutants.


    Organizational Affiliation

    Department of Biochemistry, Vanderbilt University, School of Medicine, Nashville, Tennessee 37232, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Circadian clock protein KaiA
A, B
290Synechococcus elongatus (strain PCC 7942)Mutation(s): 0 
Gene Names: kaiA
Find proteins for Q79PF6 (Synechococcus elongatus (strain PCC 7942))
Go to UniProtKB:  Q79PF6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
KaiC C-terminal peptide
G, H
20Synechococcus elongatus (strain PCC 7942)Mutation(s): 0 
Gene Names: kaiC
EC: 2.7.11.1
Find proteins for Q79PF4 (Synechococcus elongatus (strain PCC 7942))
Go to UniProtKB:  Q79PF4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
52M
Query on 52M

Download SDF File 
Download CCD File 
A, B
2-(6-hydroxy-3-oxo-3H-xanthen-9-yl)-5-[(sulfanylcarbonyl)amino]benzoic acid
C21 H13 N O6 S
YMGUTVDFHHFZIJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.240 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 97.430α = 90.00
b = 97.430β = 90.00
c = 124.520γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
Cootmodel building
PHENIXrefinement
Aimlessdata 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 StatesGM073845

Revision History 

  • Version 1.0: 2015-08-05
    Type: Initial release
  • Version 1.1: 2015-08-12
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Database references, Derived calculations