6OF7

Crystal structure of the CRY1-PER2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.11 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Dynamics at the serine loop underlie differential affinity of cryptochromes for CLOCK:BMAL1 to control circadian timing.

Fribourgh, J.L.Srivastava, A.Sandate, C.R.Michael, A.K.Hsu, P.L.Rakers, C.Nguyen, L.T.Torgrimson, M.R.Parico, G.C.G.Tripathi, S.Zheng, N.Lander, G.C.Hirota, T.Tama, F.Partch, C.L.

(2020) Elife 9

  • DOI: 10.7554/eLife.55275
  • Primary Citation of Related Structures:  
    6OF7

  • PubMed Abstract: 
  • Mammalian circadian rhythms are generated by a transcription-based feedback loop in which CLOCK:BMAL1 drives transcription of its repressors (PER1/2, CRY1/2), which ultimately interact with CLOCK:BMAL1 to close the feedback loop with ~24 hr periodicity. Here we pinpoint a key difference between CRY1 and CRY2 that underlies their differential strengths as transcriptional repressors ...

    Mammalian circadian rhythms are generated by a transcription-based feedback loop in which CLOCK:BMAL1 drives transcription of its repressors (PER1/2, CRY1/2), which ultimately interact with CLOCK:BMAL1 to close the feedback loop with ~24 hr periodicity. Here we pinpoint a key difference between CRY1 and CRY2 that underlies their differential strengths as transcriptional repressors. Both cryptochromes bind the BMAL1 transactivation domain similarly to sequester it from coactivators and repress CLOCK:BMAL1 activity. However, we find that CRY1 is recruited with much higher affinity to the PAS domain core of CLOCK:BMAL1, allowing it to serve as a stronger repressor that lengthens circadian period. We discovered a dynamic serine-rich loop adjacent to the secondary pocket in the photolyase homology region (PHR) domain that regulates differential binding of cryptochromes to the PAS domain core of CLOCK:BMAL1. Notably, binding of the co-repressor PER2 remodels the serine loop of CRY2, making it more CRY1-like and enhancing its affinity for CLOCK:BMAL1.


    Organizational Affiliation

    Center for Circadian Biology, University of California San Diego, La Jolla, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cryptochrome-1A491Mus musculusMutation(s): 0 
Gene Names: Cry1
Find proteins for P97784 (Mus musculus)
Explore P97784 
Go to UniProtKB:  P97784
NIH Common Fund Data Resources
IMPC:  MGI:1270841
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Period circadian protein homolog 2B128Homo sapiensMutation(s): 0 
Gene Names: PER2KIAA0347
Find proteins for O15055 (Homo sapiens)
Explore O15055 
Go to UniProtKB:  O15055
NIH Common Fund Data Resources
PHAROS:  O15055
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.11 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.64α = 90
b = 81.23β = 90
c = 98.1γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM107069

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-04
    Type: Initial release
  • Version 1.1: 2020-09-16
    Changes: Database references