Cited by 234Circadian rhythm and melatoninLight effects on plantsUbiquitin and proteasome pathways

SCFFBXL3 ubiquitin ligase targets cryptochromes at their cofactor pocket

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Xing, Weiman, Busino, Luca, Hinds, Thomas R., Marionni, Samuel T., Saifee, Nabiha H., Bush, Matthew F., Pagano, Michele, Zheng, Ning·2013·Nature

Abstract

The cryptochrome (CRY) flavoproteins act as blue-light receptors in plants and insects, but perform light-independent functions at the core of the mammalian circadian clock. To drive clock oscillations, mammalian CRYs associate with the Period proteins (PERs) and together inhibit the transcription of their own genes. The SCF(FBXL3) ubiquitin ligase complex controls this negative feedback loop by promoting CRY ubiquitination and degradation. However, the molecular mechanisms of their interactions and the functional role of flavin adenine dinucleotide (FAD) binding in CRYs remain poorly understood. Here we report crystal structures of mammalian CRY2 in its apo, FAD-bound and FBXL3-SKP1-complexed forms. Distinct from other cryptochromes of known structures, mammalian CRY2 binds FAD dynamically with an open cofactor pocket. Notably, the F-box protein FBXL3 captures CRY2 by simultaneously occupying its FAD-binding pocket with a conserved carboxy-terminal tail and burying its PER-binding interface. This novel F-box-protein-substrate bipartite interaction is susceptible to disruption by both FAD and PERs, suggesting a new avenue for pharmacological targeting of the complex and a multifaceted regulatory mechanism of CRY ubiquitination.

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  • The crystal structure of FBXL3 bound to a substrate does not reveal any well-defined pocket along the LRR domain.

    “The crystal structure of FBXL3 bound to a substrate does not reveal any well-defined pocket along the LRR domain 115”

    From Targeted protein degradation: expanding the toolbox (2019) · cites this paper as [115]

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Authors
Xing, W., Busino, L., Hinds, T. R., Marionni, S. T., Saifee, N. H., Bush, M. F., Pagano, M., & Zheng, N.
Affiliations
  • University of Washington (US)
  • New York University (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Zheng, Ning
Venue
Nature
Published
2013-03-17
Volume
496
Issue
7443
Pages
64-68
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2062830884
Cited by
234
References
42
Citations by year
2026: 19 · 2025: 20 · 2024: 7 · 2023: 16 · 2022: 20 · 2021: 14 · 2020: 28 · 2019: 12 · 2018: 15 · 2017: 15 · 2016: 21 · 2015: 21 · 2014: 17 · 2013: 9
FWCI
12.21
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • National Heart, Lung, and Blood Institute (T32HL007151)
  • National Cancer Institute (R01CA107134, K99CA166181, R21CA161108, R37CA076584)
  • National Institute of General Medical Sciences (R01GM057587)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
CRY2, FBXL3, FAD binding, F-box protein, circadian clock, PERIOD protein, ubiquitination, protein degradation, crystal structure, blue-light photoreceptor
MeSH terms
Animals, Apoproteins, Binding Sites, Deoxyribodipyrimidine Photo-Lyase, Drosophila melanogaster, Flavin-Adenine Dinucleotide, Humans, Models, Molecular, Substrate Specificity, Protein Structure, Tertiary, Crystallography, X-Ray, F-Box Proteins, S-Phase Kinase-Associated Proteins, SKP Cullin F-Box Protein Ligases, Mice, Cryptochromes, Hydrophobic and Hydrophilic Interactions

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