5T5X

High resolution structure of mouse Cryptochrome 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Formation of a repressive complex in the mammalian circadian clock is mediated by the secondary pocket of CRY1.

Michael, A.K.Fribourgh, J.L.Chelliah, Y.Sandate, C.R.Hura, G.L.Schneidman-Duhovny, D.Tripathi, S.M.Takahashi, J.S.Partch, C.L.

(2017) Proc. Natl. Acad. Sci. U.S.A. 114: 1560-1565

  • DOI: 10.1073/pnas.1615310114

  • PubMed Abstract: 
  • The basic helix-loop-helix PAS domain (bHLH-PAS) transcription factor CLOCK:BMAL1 (brain and muscle Arnt-like protein 1) sits at the core of the mammalian circadian transcription/translation feedback loop. Precise control of CLOCK:BMAL1 activity by c ...

    The basic helix-loop-helix PAS domain (bHLH-PAS) transcription factor CLOCK:BMAL1 (brain and muscle Arnt-like protein 1) sits at the core of the mammalian circadian transcription/translation feedback loop. Precise control of CLOCK:BMAL1 activity by coactivators and repressors establishes the ∼24-h periodicity of gene expression. Formation of a repressive complex, defined by the core clock proteins cryptochrome 1 (CRY1):CLOCK:BMAL1, plays an important role controlling the switch from repression to activation each day. Here we show that CRY1 binds directly to the PAS domain core of CLOCK:BMAL1, driven primarily by interaction with the CLOCK PAS-B domain. Integrative modeling and solution X-ray scattering studies unambiguously position a key loop of the CLOCK PAS-B domain in the secondary pocket of CRY1, analogous to the antenna chromophore-binding pocket of photolyase. CRY1 docks onto the transcription factor alongside the PAS domains, extending above the DNA-binding bHLH domain. Single point mutations at the interface on either CRY1 or CLOCK disrupt formation of the ternary complex, highlighting the importance of this interface for direct regulation of CLOCK:BMAL1 activity by CRY1.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Santa Cruz, CA 95064.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cryptochrome-1
A
491Mus musculusMutation(s): 0 
Gene Names: Cry1
Find proteins for P97784 (Mus musculus)
Go to UniProtKB:  P97784
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.84 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.168 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 43.630α = 71.62
b = 51.035β = 84.12
c = 54.175γ = 88.89
Software Package:
Software NamePurpose
PHASERphasing
SCALAdata scaling
iMOSFLMdata reduction
PHENIXrefinement

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 StatesGM107069
National Institutes of Health/National Cancer InstituteUnited StatesCA189660

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-15
    Type: Database references
  • Version 1.2: 2017-02-22
    Type: Database references
  • Version 1.3: 2017-09-06
    Type: Author supporting evidence