Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 86276.09 
• Atom Count: 5101 
• Residue Count: 748 
• Unique protein chains: 2

4F3L

Crystal Structure of the Heterodimeric CLOCK:BMAL1 Transcriptional Activator Complex

• DOI: 10.2210/pdb4F3L/pdb

• Classification: TRANSCRIPTION/ACTIVATOR
• Organism(s): Mus musculus
• Expression System: Spodoptera frugiperda


• Deposited: 2012-05-09 Released: 2012-06-06 
• Deposition Author(s): Huang, N., Chelliah, Y., Shan, Y., Taylor, C., Yoo, S., Partch, C., Green, C.B., Zhang, H., Takahashi, J.

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Experimental Data Snapshot

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

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

• PubMed: 22653727 
• 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 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.

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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
Molecule	Chains	Sequence Length	Organism	Details
BMAL1b	B	387	Mus musculus	Mutation(s): 0  Gene Names: Arntl (Bmal1)
Find proteins for Q9WTL8 (Mus musculus) Go to UniProtKB:  Q9WTL8

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Circadian locomoter output cycles protein kaput	A	361	Mus musculus	Mutation(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 = 67.242	α = 90.00
b = 71.955	β = 90.00
c = 173.306	γ = 90.00

Software Package:

Software Name	Purpose
HKL-3000	data collection
HKL-3000	data reduction
SHARP	phasing
PHENIX	refinement
HKL-3000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-05-09 
• Released Date: 2012-06-06 
• Deposition Author(s): Huang, N., Chelliah, Y., Shan, Y., Taylor, C., Yoo, S., Partch, C., Green, C.B., Zhang, H., Takahashi, J.

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