4F3L

Crystal Structure of the Heterodimeric CLOCK:BMAL1 Transcriptional Activator Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.268 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 

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

  • 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 hel ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BMAL1b
B
387Mus musculusMutation(s): 0 
Gene Names: Arntl (Bmal1)
Find proteins for Q9WTL8 (Mus musculus)
Go to UniProtKB:  Q9WTL8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Circadian locomoter output cycles protein kaput
A
361Mus musculusMutation(s): 0 
Gene Names: Clock
EC: 2.3.1.48
Find proteins for O08785 (Mus musculus)
Go to UniProtKB:  O08785
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.268 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.184 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.242α = 90.00
b = 71.955β = 90.00
c = 173.306γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data collection
SHARPphasing
HKL-3000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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