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

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [2];  [1];  [3];  [4]; ORCiD logo [1];  [2];  [5]
  1. Univ. of California, Santa Cruz, CA (United States). Dept. of Chemistry and Biochemistry
  2. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Neuroscience; Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Howard Hughes Medical Inst.
  3. Univ. of California, Santa Cruz, CA (United States). Dept. of Chemistry and Biochemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
  4. Hebrew Univ. of Jerusalem (Israel). School of Computer Science and Engineering, Inst. of Life Sciences
  5. Univ. of California, Santa Cruz, CA (United States). Dept. of Chemistry and Biochemistry; Univ. of California, San Diego, CA (United States). Center for Circadian Biology

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 in this paper, 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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231; GM107069
OSTI ID:
1379737
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 7; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Cited By (15)

An evolutionary hotspot defines functional differences between CRYPTOCHROMES journal March 2018
Vertebrate-like CRYPTOCHROME 2 from monarch regulates circadian transcription via independent repression of CLOCK and BMAL1 activity journal August 2017
Circadian repressors CRY1 and CRY2 broadly interact with nuclear receptors and modulate transcriptional activity journal July 2017
Nuclear receptor HNF4A transrepresses CLOCK:BMAL1 and modulates tissue-specific circadian networks journal December 2018
Regulating behavior with the flip of a translational switch journal December 2018
Chemical and structural analysis of a photoactive vertebrate cryptochrome from pigeon journal September 2019
Casein Kinase 1 dynamics underlie the PER2 circadian phosphoswitch journal August 2019
Protein dynamics regulate distinct biochemical properties of cryptochromes in mammalian circadian rhythms posted_content August 2019
The CRY1 tail controls circadian timing by regulating its association with CLOCK:BMAL1 journal September 2019
Principles of the animal molecular clock learned from Neurospora journal February 2019
Allosteric mechanism of the circadian protein Vivid resolved through Markov state model and machine learning analysis journal February 2019
The Circadian Clock Protein CRY1 Is a Negative Regulator of HIF-1α journal March 2019
An evolutionary hotspot defines functional differences between CRYPTOCHROMES journal March 2018
Allosteric mechanism of the circadian protein Vivid resolved through Markov state model and machine learning analysis journal February 2019
Casein kinase 1 dynamics underlie substrate selectivity and the PER2 circadian phosphoswitch journal February 2020