4F3L

Crystal Structure of the Heterodimeric CLOCK:BMAL1 Transcriptional Activator Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the heterodimeric CLOCK:BMAL1 transcriptional activator complex.

Huang, N.Chelliah, Y.Shan, Y.Taylor, C.A.Yoo, S.H.Partch, C.Green, C.B.Zhang, H.Takahashi, J.S.

(2012) Science 337: 189-194

  • DOI: 10.1126/science.1222804
  • Primary Citation of Related Structures:  
    4F3L

  • PubMed Abstract: 
  • The circadian clock in mammals is driven by an autoregulatory transcriptional feedback mechanism that takes approximately 24 hours to complete. A key component of this mechanism is a heterodimeric transcriptional activator consisting of two basic helix-loop-helix PER-ARNT-SIM (bHLH-PAS) domain protein subunits, CLOCK and BMAL1 ...

    The circadian clock in mammals is driven by an autoregulatory transcriptional feedback mechanism that takes approximately 24 hours to complete. A key component of this mechanism is a heterodimeric transcriptional activator consisting of two basic helix-loop-helix PER-ARNT-SIM (bHLH-PAS) domain protein subunits, CLOCK and BMAL1. Here, we report the crystal structure of a complex containing the mouse CLOCK:BMAL1 bHLH-PAS domains at 2.3 Å resolution. The structure reveals an unusual asymmetric heterodimer with the three domains in each of the two subunits--bHLH, PAS-A, and PAS-B--tightly intertwined and involved in dimerization interactions, resulting in three distinct protein interfaces. Mutations that perturb the observed heterodimer interfaces affect the stability and activity of the CLOCK:BMAL1 complex as well as the periodicity of the circadian oscillator. The structure of the CLOCK:BMAL1 complex is a starting point for understanding at an atomic level the mechanism driving the mammalian circadian clock.


    Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BMAL1bA [auth B]387Mus musculusMutation(s): 0 
Gene Names: ArntlBmal1bmal1b
UniProt
Find proteins for Q9WTL8 (Mus musculus)
Explore Q9WTL8 
Go to UniProtKB:  Q9WTL8
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Circadian locomoter output cycles protein kaputB [auth A]361Mus musculusMutation(s): 0 
Gene Names: Clock
EC: 2.3.1.48
UniProt
Find proteins for O08785 (Mus musculus)
Explore O08785 
Go to UniProtKB:  O08785
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.27 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.242α = 90
b = 71.955β = 90
c = 173.306γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
SHARPphasing
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-06
    Type: Initial release
  • Version 1.1: 2012-08-01
    Changes: Database references
  • Version 1.2: 2018-12-05
    Changes: Data collection