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Yorodumi- PDB-8dd7: The Cryo-EM structure of Drosophila Cryptochrome in complex with ... -
+Open data
-Basic information
Entry | Database: PDB / ID: 8dd7 | ||||||
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Title | The Cryo-EM structure of Drosophila Cryptochrome in complex with Timeless | ||||||
Components |
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Keywords | CIRCADIAN CLOCK PROTEIN / Flavoprotein / Nuclear import / Light-sensor / Armadillo-repeat protein | ||||||
Function / homology | Function and homology information Nuclear import of PER and TIM / Dephosphorylation of TIM / circadian regulation of heart rate / negative phototaxis / UV-A, blue light phototransduction / photoperiodism / regulation of circadian sleep/wake cycle / magnetoreception / detection of light stimulus involved in magnetoreception / : ...Nuclear import of PER and TIM / Dephosphorylation of TIM / circadian regulation of heart rate / negative phototaxis / UV-A, blue light phototransduction / photoperiodism / regulation of circadian sleep/wake cycle / magnetoreception / detection of light stimulus involved in magnetoreception / : / eclosion rhythm / Transcription repression by PER and activation by PDP1 / Dephosphorylation of PER / gravitaxis / Phosphorylation of PER and TIM / copulation / Degradation of CRY / Degradation of TIM / blue light signaling pathway / circadian temperature homeostasis / rhythmic behavior / regulation of protein import into nucleus / negative regulation of transcription regulatory region DNA binding / response to magnetism / methylated-DNA-[protein]-cysteine S-methyltransferase / methylated-DNA-[protein]-cysteine S-methyltransferase activity / replication fork arrest / response to blue light / regulation of circadian sleep/wake cycle, sleep / DNA modification / cellular response to light stimulus / blue light photoreceptor activity / entrainment of circadian clock / DNA replication checkpoint signaling / regulation of phagocytosis / replication fork protection complex / mating behavior / circadian behavior / entrainment of circadian clock by photoperiod / locomotor rhythm / photoreceptor activity / transcription factor binding / response to light stimulus / phototransduction / positive regulation of phagocytosis / FAD binding / circadian regulation of gene expression / regulation of circadian rhythm / circadian rhythm / flavin adenine dinucleotide binding / methylation / protein heterodimerization activity / DNA repair / negative regulation of DNA-templated transcription / perinuclear region of cytoplasm / negative regulation of transcription by RNA polymerase II / DNA binding / nucleoplasm / metal ion binding / nucleus / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | Homo sapiens (human) Drosophila melanogaster (fruit fly) | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å | ||||||
Authors | Feng, S. / Lin, C. / DeOliveira, C.C. / Crane, B.R. | ||||||
Funding support | United States, 1items
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Citation | Journal: Nature / Year: 2023 Title: Cryptochrome-Timeless structure reveals circadian clock timing mechanisms. Authors: Changfan Lin / Shi Feng / Cristina C DeOliveira / Brian R Crane / Abstract: Circadian rhythms influence many behaviours and diseases. They arise from oscillations in gene expression caused by repressor proteins that directly inhibit transcription of their own genes. The fly ...Circadian rhythms influence many behaviours and diseases. They arise from oscillations in gene expression caused by repressor proteins that directly inhibit transcription of their own genes. The fly circadian clock offers a valuable model for studying these processes, wherein Timeless (Tim) plays a critical role in mediating nuclear entry of the transcriptional repressor Period (Per) and the photoreceptor Cryptochrome (Cry) entrains the clock by triggering Tim degradation in light. Here, through cryogenic electron microscopy of the Cry-Tim complex, we show how a light-sensing cryptochrome recognizes its target. Cry engages a continuous core of amino-terminal Tim armadillo repeats, resembling how photolyases recognize damaged DNA, and binds a C-terminal Tim helix, reminiscent of the interactions between light-insensitive cryptochromes and their partners in mammals. The structure highlights how the Cry flavin cofactor undergoes conformational changes that couple to large-scale rearrangements at the molecular interface, and how a phosphorylated segment in Tim may impact clock period by regulating the binding of Importin-α and the nuclear import of Tim-Per. Moreover, the structure reveals that the N terminus of Tim inserts into the restructured Cry pocket to replace the autoinhibitory C-terminal tail released by light, thereby providing a possible explanation for how the long-short Tim polymorphism adapts flies to different climates. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8dd7.cif.gz | 258.6 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8dd7.ent.gz | 195.3 KB | Display | PDB format |
PDBx/mmJSON format | 8dd7.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/dd/8dd7 ftp://data.pdbj.org/pub/pdb/validation_reports/dd/8dd7 | HTTPS FTP |
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-Related structure data
Related structure data | 27335MC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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-Components
#1: Protein | Mass: 83838.617 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Drosophila melanogaster (fruit fly) Cell (production host): S2 cell / Production host: Drosophila melanogaster (fruit fly) / References: UniProt: E5BBQ0, UniProt: O77059 |
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#2: Protein | Mass: 179996.109 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Drosophila melanogaster (fruit fly), (gene. exp.) Homo sapiens (human) Cell (production host): S2 cell / Production host: Drosophila melanogaster (fruit fly) References: UniProt: P49021, UniProt: E5BBQ0, methylated-DNA-[protein]-cysteine S-methyltransferase |
#3: Chemical | ChemComp-FAD / |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Complex of Drosophila Cryptochrome and Timeless / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.264 MDa / Experimental value: YES |
Source (natural) | Organism: Drosophila melanogaster (fruit fly) |
Source (recombinant) | Organism: Drosophila melanogaster (fruit fly) |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE-PROPANE |
-Electron microscopy imaging
Experimental equipment | Model: Talos Arctica / Image courtesy: FEI Company |
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Microscopy | Model: FEI TALOS ARCTICA |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm |
Image recording | Electron dose: 53 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
-Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 160000 / Symmetry type: POINT |