1SUY

NMR structure of the ThKaiA180C-CIIABD complex (average minimized structure)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the C-terminal domain of the clock protein KaiA in complex with a KaiC-derived peptide: implications for KaiC regulation.

Vakonakis, I.LiWang, A.C.

(2004) Proc Natl Acad Sci U S A 101: 10925-10930

  • DOI: 10.1073/pnas.0403037101
  • Primary Citation of Related Structures:  
    1SV1, 1SUY

  • PubMed Abstract: 
  • Circadian clocks are widespread endogenous mechanisms that control the temporal pattern of diverse biological processes, including gene transcription. KaiA is the positive element of the cyanobacterial clock because KaiA overexpression elevates transcription levels of clock components ...

    Circadian clocks are widespread endogenous mechanisms that control the temporal pattern of diverse biological processes, including gene transcription. KaiA is the positive element of the cyanobacterial clock because KaiA overexpression elevates transcription levels of clock components. Recently, we showed that the structure of KaiA is that of a domain-swapped homodimer. The N-terminal domain is a pseudo-receiver; thus, it is likely to be involved in signal transduction in the clock-resetting pathway. The C-terminal domain of KaiA is structurally novel and enhances the KaiC autokinase activity directly. Here, we report the NMR structure of the C-terminal domain of KaiA (ThKaiA180C) in complex with a KaiC-derived peptide from the cyanobacterium Thermosynechococcus elongatus BP-1. The protein-peptide interface is revealed to be different from a model that was proposed earlier, is stabilized by a combination of hydrophobic and electrostatic interactions, and includes many residues known to produce a circadian-period phenotype upon substitution. Although the structure of the monomeric subunit of ThKaiA180C is largely unchanged upon peptide binding, the intersubunit dimerization angle changes. It is proposed that modulation of the C-terminal KaiA domain dimerization angle regulates KaiA-KaiC interactions.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, 77843-2128, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
circadian clock protein KaiA AB107Thermosynechococcus elongatus BP-1Mutation(s): 0 
Gene Names: kaiAtlr0481
Find proteins for Q79V62 (Thermosynechococcus elongatus (strain BP-1))
Explore Q79V62 
Go to UniProtKB:  Q79V62
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
circadian clock protein KaiC CD34Thermosynechococcus elongatus BP-1Mutation(s): 0 
Gene Names: kaiCtlr0483
EC: 2.7.11.1
Find proteins for Q79V60 (Thermosynechococcus elongatus (strain BP-1))
Explore Q79V60 
Go to UniProtKB:  Q79V60
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 
  • OLDERADO: 1SUY Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance