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- EMDB-34707: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state -

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Basic information

Entry
Database: EMDB / ID: EMD-34707
TitleDmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state
Map data
Sample
  • Complex: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state
    • Protein or peptide: Dicer-2, isoform A
    • Protein or peptide: Loquacious, isoform DVerbosity
    • Protein or peptide: LD06392p
    • RNA: RNA (52-MER)
KeywordsRibonuclease / DOUBLE STRANDED RNA / RNA BINDING PROTEIN-RNA COMPLEX
Function / homology
Function and homology information


follicle cell of egg chamber stalk formation / regulatory ncRNA processing / bidentate ribonuclease III activity / positive regulation of Toll signaling pathway / MicroRNA (miRNA) biogenesis / Small interfering RNA (siRNA) biogenesis / female germ-line stem cell asymmetric division / PKR-mediated signaling / regulation of regulatory ncRNA processing / dsRNA transport ...follicle cell of egg chamber stalk formation / regulatory ncRNA processing / bidentate ribonuclease III activity / positive regulation of Toll signaling pathway / MicroRNA (miRNA) biogenesis / Small interfering RNA (siRNA) biogenesis / female germ-line stem cell asymmetric division / PKR-mediated signaling / regulation of regulatory ncRNA processing / dsRNA transport / dosage compensation by hyperactivation of X chromosome / RISC complex binding / global gene silencing by mRNA cleavage / germ-line stem cell population maintenance / ribonuclease III / apoptotic DNA fragmentation / miRNA metabolic process / deoxyribonuclease I activity / RISC-loading complex / detection of virus / RISC complex assembly / regulatory ncRNA-mediated post-transcriptional gene silencing / ribonuclease III activity / pre-miRNA processing / siRNA processing / siRNA binding / ATP-dependent activity, acting on RNA / positive regulation of innate immune response / RISC complex / heterochromatin formation / positive regulation of defense response to virus by host / helicase activity / locomotory behavior / central nervous system development / mRNA 3'-UTR binding / cellular response to virus / cytoplasmic ribonucleoprotein granule / double-stranded RNA binding / defense response to virus / perinuclear region of cytoplasm / ATP hydrolysis activity / RNA binding / ATP binding / nucleus / cytosol / cytoplasm
Similarity search - Function
: / Dicer, platform domain / Dicer dimerisation domain / Dicer dimerisation domain / Dicer dimerisation domain superfamily / Dicer double-stranded RNA-binding fold domain profile. / Ribonuclease III domain / Ribonuclease III family domain profile. / Ribonuclease III family / Ribonuclease III domain ...: / Dicer, platform domain / Dicer dimerisation domain / Dicer dimerisation domain / Dicer dimerisation domain superfamily / Dicer double-stranded RNA-binding fold domain profile. / Ribonuclease III domain / Ribonuclease III family domain profile. / Ribonuclease III family / Ribonuclease III domain / PAZ / PAZ domain / PAZ domain / PAZ domain profile. / Double-stranded RNA binding motif / Double-stranded RNA binding motif / Ribonuclease III, endonuclease domain superfamily / Double stranded RNA-binding domain (dsRBD) profile. / Double-stranded RNA-binding domain / DEAD/DEAH box helicase / DEAD/DEAH box helicase domain / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Endoribonuclease Dcr-2 / Protein Loquacious / LD06392p
Similarity search - Component
Biological speciesDrosophila melanogaster (fruit fly)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.72 Å
AuthorsSu S / Wang J / Wang HW / Ma J
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32000849 China
CitationJournal: Nat Commun / Year: 2023
Title: Structural mechanism of R2D2 and Loqs-PD synergistic modulation on DmDcr-2 oligomers.
Authors: Ting Deng / Shichen Su / Xun Yuan / Jinqiu He / Ying Huang / Jinbiao Ma / Jia Wang /
Abstract: Small interference RNAs are the key components of RNA interference, a conserved RNA silencing or viral defense mechanism in many eukaryotes. In Drosophila melanogaster, Dicer-2 (DmDcr-2)-mediated ...Small interference RNAs are the key components of RNA interference, a conserved RNA silencing or viral defense mechanism in many eukaryotes. In Drosophila melanogaster, Dicer-2 (DmDcr-2)-mediated RNAi pathway plays important roles in defending against viral infections and protecting genome integrity. During the maturation of siRNAs, two cofactors can regulate DmDcr-2's functions: Loqs-PD that is required for dsRNA processing, and R2D2 that is essential for the subsequent loading of siRNAs into effector Ago2 to form RISC complexes. However, due to the lack of structural information, it is still unclear whether R2D2 and Loqs-PD affect the functions of DmDcr-2 simultaneously. Here we present several cryo-EM structures of DmDcr-2/R2D2/Loqs-PD complex bound to dsRNAs with various lengths by the Helicase domain. These structures revealed that R2D2 and Loqs-PD can bind to different regions of DmDcr-2 without interfering with each other. Furthermore, the cryo-EM results demonstrate that these complexes can form large oligomers and assemble into fibers. The formation and depolymerization of these oligomers are associated with ATP hydrolysis. These findings provide insights into the structural mechanism of DmDcr-2 and its cofactors during siRNA processing.
History
DepositionNov 9, 2022-
Header (metadata) releaseSep 6, 2023-
Map releaseSep 6, 2023-
UpdateSep 6, 2023-
Current statusSep 6, 2023Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_34707.png

Downloads & links

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Map

FileDownload / File: emd_34707.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.0742 Å
Density
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-0.5443214 - 1.237303
Average (Standard dev.)0.0068002013 (±0.045622524)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 274.9952 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_34707_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_34707_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state

EntireName: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state
Components
  • Complex: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state
    • Protein or peptide: Dicer-2, isoform A
    • Protein or peptide: Loquacious, isoform DVerbosity
    • Protein or peptide: LD06392p
    • RNA: RNA (52-MER)

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Supramolecule #1: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state

SupramoleculeName: DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 300 KDa

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Macromolecule #1: Dicer-2, isoform A

MacromoleculeName: Dicer-2, isoform A / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: deoxyribonuclease I
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 198.006688 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MEDVEIKPRG YQLRLVDHLT KSNGIVYLPT GSGKTFVAIL VLKRFSQDFD KPIESGGKRA LFMCNTVELA RQQAMAVRRC TNFKVGFYV GEQGVDDWTR GMWSDEIKKN QVLVGTAQVF LDMVTQTYVA LSSLSVVIID ECHHGTGHHP FREFMRLFTI A NQTKLPRV ...String:
MEDVEIKPRG YQLRLVDHLT KSNGIVYLPT GSGKTFVAIL VLKRFSQDFD KPIESGGKRA LFMCNTVELA RQQAMAVRRC TNFKVGFYV GEQGVDDWTR GMWSDEIKKN QVLVGTAQVF LDMVTQTYVA LSSLSVVIID ECHHGTGHHP FREFMRLFTI A NQTKLPRV VGLTGVLIKG NEITNVATKL KELEITYRGN IITVSDTKEM ENVMLYATKP TEVMVSFPHQ EQVLTVTRLI SA EIEKFYV SLDLMNIGVQ PIRRSKSLQC LRDPSKKSFV KQLFNDFLYQ MKEYGIYAAS IAIISLIVEF DIKRRQAETL SVK LMHRTA LTLCEKIRHL LVQKLQDMTY DDDDDNVNTE EVIMNFSTPK VQRFLMSLKV SFADKDPKDI CCLVFVERRY TCKC IYGLL LNYIQSTPEL RNVLTPQFMV GRNNISPDFE SVLERKWQKS AIQQFRDGNA NLMICSSVLE EGIDVQACNH VFILD PVKT FNMYVQSKGR ARTTEAKFVL FTADKEREKT IQQIYQYRKA HNDIAEYLKD RVLEKTEPEL YEIKGHFQDD IDPFTN ENG AVLLPNNALA ILHRYCQTIP TDAFGFVIPW FHVLQEDERD RIFGVSAKGK HVISINMPVN CMLRDTIYSD PMDNVKT AK ISAAFKACKV LYSLGELNER FVPKTLKERV ASIADVHFEH WNKYGDSVTA TVNKADKSKD RTYKTECPLE FYDALPRV G EICYAYEIFL EPQFESCEYT EHMYLNLQTP RNYAILLRNK LPRLAEMPLF SNQGKLHVRV ANAPLEVIIQ NSEQLELLH QFHGMVFRDI LKIWHPFFVL DRRSKENSYL VVPLILGAGE QKCFDWELMT NFRRLPQSHG SNVQQREQQP APRPEDFEGK IVTQWYANY DKPMLVTKVH RELTPLSYME KNQQDKTYYE FTMSKYGNRI GDVVHKDKFM IEVRDLTEQL TFYVHNRGKF N AKSKAKMK VILIPELCFN FNFPGDLWLK LIFLPSILNR MYFLLHAEAL RKRFNTYLNL HLLPFNGTDY MPRPLEIDYS LK RNVDPLG NVIPTEDIEE PKSLLEPMPT KSIEASVANL EITEFENPWQ KYMEPVDLSR NLLSTYPVEL DYYYHFSVGN VCE MNEMDF EDKEYWAKNQ FHMPTGNIYG NRTPAKTNAN VPALMPSKPT VRGKVKPLLI LQKTVSKEHI TPAEQGEFLA AITA SSAAD VFDMERLEIL GNSFLKLSAT LYLASKYSDW NEGTLTEVKS KLVSNRNLLF CLIDADIPKT LNTIQFTPRY TWLPP GISL PHNVLALWRE NPEFAKIIGP HNLRDLALGD EESLVKGNCS DINYNRFVEG CRANGQSFYA GADFSSEVNF CVGLVT IPN KVIADTLEAL LGVIVKNYGL QHAFKMLEYF KICRADIDKP LTQLLNLELG GKKMRANVNT TEIDGFLINH YYLEKNL GY TFKDRRYLLQ ALTHPSYPTN RITGSYQELE FIGNAILDFL ISAYIFENNT KMNPGALTDL RSALVNNTTL ACICVRHR L HFFILAENAK LSEIISKFVN FQESQGHRVT NYVRILLEEA DVQPTPLDLD DELDMTELPH ANKCISQEAE KGVPPKGEF NMSTNVDVPK ALGDVLEALI AAVYLDCRDL QRTWEVIFNL FEPELQEFTR KVPINHIRQL VEHKHAKPVF SSPIVEGETV MVSCQFTCM EKTIKVYGFG SNKDQAKLSA AKHALQQLSK CDA

UniProtKB: Endoribonuclease Dcr-2

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Macromolecule #2: Loquacious, isoform D

MacromoleculeName: Loquacious, isoform D / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 38.502574 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDQENFHGSS LPQQLQNLHI QPQQASPNPV QTGFAPRRHY NNLVGLGNGN AVSGSPVKGA PLGQRHVKLK KEKISAQVAQ LSQPGQLQL SDVGDPALAG GSGLQGGVGL MGVILPSDEA LKFVSETDAN GLAMKTPVSI LQELLSRRGI TPGYELVQIE G AIHEPTFR ...String:
MDQENFHGSS LPQQLQNLHI QPQQASPNPV QTGFAPRRHY NNLVGLGNGN AVSGSPVKGA PLGQRHVKLK KEKISAQVAQ LSQPGQLQL SDVGDPALAG GSGLQGGVGL MGVILPSDEA LKFVSETDAN GLAMKTPVSI LQELLSRRGI TPGYELVQIE G AIHEPTFR FRVSFKDKDT PFTAMGAGRS KKEAKHAAAR ALIDKLIGAQ LPESPSSSAG PSVTGLTVAG SGGDGNANAT GG GDASDKT VGNPIGWLQE MCMQRRWPPP SYETETEVGL PHERLFTIAC SILNYREMGK GKSKKIAKRL AAHRMWMRLQ ETP IDSGKI SDSICGELEG EVSIIQDIDR YEQVSKDFEF IKI

UniProtKB: Protein Loquacious

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Macromolecule #3: LD06392p

MacromoleculeName: LD06392p / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 35.115254 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDNKSAVSAL QEFCARTQIN LPTYSFIPGE DGGYVCKVEL LEIEALGNGR SKRDAKHLAA SNILRKIQLL PGIHGLMKDS TVGDLDEEL TNLNRDMVKE LRDYCVRREM PLPCIEVVQQ SGTPSAPEFV ACCSVASIVR YGKSDKKKDA RQRAAIEMLA L ISSNSDNL ...String:
MDNKSAVSAL QEFCARTQIN LPTYSFIPGE DGGYVCKVEL LEIEALGNGR SKRDAKHLAA SNILRKIQLL PGIHGLMKDS TVGDLDEEL TNLNRDMVKE LRDYCVRREM PLPCIEVVQQ SGTPSAPEFV ACCSVASIVR YGKSDKKKDA RQRAAIEMLA L ISSNSDNL RPDQMQVAST SKLKVVDMEE SMEELEALRR KKFTTYWELK EAGSVDHTGM RLCDRHNYFK NFYPTLKKEA IE AINSDEY ESSKDKAMDV MSSLKITPKI SEVESSSLVP LLSVELNCAF DVVLMAKETD IYDHIIDYFR TMLI

UniProtKB: LD06392p

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Macromolecule #4: RNA (52-MER)

MacromoleculeName: RNA (52-MER) / type: rna / ID: 4 / Details: dsRNA / Number of copies: 2
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 16.646871 KDa
SequenceString:
GAGACUUGGG CAAUGUGACU GCUGAUCAGC AGUCACAUUG CCCAAGUCUC UU

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.3 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.0 µm
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionNumber classes used: 1 / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.72 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.2) / Number images used: 141544

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Atomic model buiding 1

RefinementProtocol: RIGID BODY FIT
Output model

PDB-8hf0:
DmDcr-2/R2D2/LoqsPD with 50bp-dsRNA in Dimer state

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