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- EMDB-39319: DmDcr-2/LoqsPD/slm1 in pre-dicing state -

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Basic information

Entry
Database: EMDB / ID: EMD-39319
TitleDmDcr-2/LoqsPD/slm1 in pre-dicing state
Map data
Sample
  • Complex: DmDcr-2/LoqsPD/slm2 in initial binding state
    • Protein or peptide: Isoform PD of Protein Loquacious
    • Protein or peptide: Dicer-2, isoform A
    • RNA: slm1
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
KeywordsRNAi / Dcr-2 / Loqs-PD / esiRNA / Cryo-EM / STRUCTURAL PROTEIN/RNA / STRUCTURAL PROTEIN-RNA complex
Function / homology
Function and homology information


positive regulation of Toll signaling pathway / lncRNA catabolic process / MicroRNA (miRNA) biogenesis / RNAi-mediated antiviral immune response / Small interfering RNA (siRNA) biogenesis / female germ-line stem cell asymmetric division / PKR-mediated signaling / regulation of regulatory ncRNA processing / dosage compensation by hyperactivation of X chromosome / RISC complex binding ...positive regulation of Toll signaling pathway / lncRNA catabolic process / MicroRNA (miRNA) biogenesis / RNAi-mediated antiviral immune response / Small interfering RNA (siRNA) biogenesis / female germ-line stem cell asymmetric division / PKR-mediated signaling / regulation of regulatory ncRNA processing / dosage compensation by hyperactivation of X chromosome / RISC complex binding / global gene silencing by mRNA cleavage / apoptotic DNA fragmentation / germ-line stem cell population maintenance / ribonuclease III / deoxyribonuclease I activity / miRNA metabolic process / RISC-loading complex / detection of virus / regulatory ncRNA-mediated post-transcriptional gene silencing / RISC complex assembly / ribonuclease III activity / pre-miRNA processing / siRNA processing / siRNA binding / ATP-dependent activity, acting on RNA / RISC complex / positive regulation of innate immune response / positive regulation of defense response to virus by host / central nervous system development / mRNA 3'-UTR binding / helicase activity / locomotory behavior / cellular response to virus / cytoplasmic ribonucleoprotein granule / heterochromatin formation / 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 superfamily / Dicer dimerisation domain / Dicer double-stranded RNA-binding fold domain profile. / Ribonuclease III domain / Ribonuclease III family domain profile. / Ribonuclease III family ...: / : / Dicer, platform domain / Dicer dimerisation domain / Dicer dimerisation domain superfamily / Dicer dimerisation domain / 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 profile. / PAZ domain / 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 domain / DEAD/DEAH box helicase / 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
Similarity search - Component
Biological speciesDrosophila melanogaster (fruit fly)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.08 Å
AuthorsCao N / Su S / Wang J / Ma J / Wang H-W
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nucleic Acids Res / Year: 2025
Title: Structural basis of endo-siRNA processing by Drosophila Dicer-2 and Loqs-PD.
Authors: Na Cao / Jia Wang / Ting Deng / Boming Fan / Shichen Su / Jinbiao Ma / Hong-Wei Wang /
Abstract: Endogenous small interfering RNAs (endo-siRNAs or esiRNAs) originate from either elongated endogenous transcripts capable of forming complex fold-back structures or from double-stranded regions ...Endogenous small interfering RNAs (endo-siRNAs or esiRNAs) originate from either elongated endogenous transcripts capable of forming complex fold-back structures or from double-stranded regions generated through intermolecular base pairing of convergently transcribed mRNAs. The mechanism of maturation and functionality of esiRNAs exhibit significant variation across diverse species. In Drosophila melanogaster, esiRNAs reside in both somatic and germline cells, where they serve as post-transcriptional modulators for specific target RNAs. Their maturation process critically relies on Dicer-2 (Dcr-2), with the assistance of its cofactor Loqs-PD. In this study, we have successfully elucidated the cryo-EM structures of Dcr-2/Loqs-PD complex bound to esiRNA precursors (pre-esiRNAs) in various states. Our structural and biochemical results reveal that ATP is essential for the cleavage of esiRNAs by the Dcr-2/Loqs-PD complex, a process analogous to the cleavage of double-stranded RNA (dsRNA). When Loqs-PD is present, pre-esiRNAs are preferentially loaded onto the Helicase domain of Dcr-2. Moreover, as the Helicase domain exhibits a preference for binding to the rigid end of double-stranded RNA, Dcr-2 tends to cleave pre-esiRNA from the small closed loop end, rather than the loose and flexible open end.
History
DepositionFeb 29, 2024-
Header (metadata) releaseMar 5, 2025-
Map releaseMar 5, 2025-
UpdateMar 12, 2025-
Current statusMar 12, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_39319.png

Downloads & links

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Map

FileDownload / File: emd_39319.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 240 pix.
= 257.808 Å		1.07 Å/pix.
x 240 pix.
= 257.808 Å		1.07 Å/pix.
x 240 pix.
= 257.808 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0742 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-0.51872617 - 1.140864
Average (Standard dev.)0.00281197 (±0.048558917)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 257.808 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_39319_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_39319_half_map_2.map
Projections & Slices
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Histogram

Histogram (log scale)

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Sample components

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Entire : DmDcr-2/LoqsPD/slm2 in initial binding state

EntireName: DmDcr-2/LoqsPD/slm2 in initial binding state
Components
  • Complex: DmDcr-2/LoqsPD/slm2 in initial binding state
    • Protein or peptide: Isoform PD of Protein Loquacious
    • Protein or peptide: Dicer-2, isoform A
    • RNA: slm1
  • Ligand: MAGNESIUM ION
  • Ligand: ADENOSINE-5'-DIPHOSPHATE

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Supramolecule #1: DmDcr-2/LoqsPD/slm2 in initial binding state

SupramoleculeName: DmDcr-2/LoqsPD/slm2 in initial binding state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 200 KDa

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Macromolecule #1: Isoform PD of Protein Loquacious

MacromoleculeName: Isoform PD of Protein Loquacious / type: protein_or_peptide / ID: 1 / 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 #2: Dicer-2, isoform A

MacromoleculeName: Dicer-2, isoform A / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO / EC number: deoxyribonuclease I
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 197.875484 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: EDVEIKPRGY QLRLVDHLTK SNGIVYLPTG SGKTFVAILV LKRFSQDFDK PIESGGKRAL FMCNTVELAR QQAMAVRRCT NFKVGFYVG EQGVDDWTRG MWSDEIKKNQ VLVGTAQVFL DMVTQTYVAL SSLSVVIIDE CHHGTGHHPF REFMRLFTIA N QTKLPRVV ...String:
EDVEIKPRGY QLRLVDHLTK SNGIVYLPTG SGKTFVAILV LKRFSQDFDK PIESGGKRAL FMCNTVELAR QQAMAVRRCT NFKVGFYVG EQGVDDWTRG MWSDEIKKNQ VLVGTAQVFL DMVTQTYVAL SSLSVVIIDE CHHGTGHHPF REFMRLFTIA N QTKLPRVV GLTGVLIKGN EITNVATKLK ELEITYRGNI ITVSDTKEME NVMLYATKPT EVMVSFPHQE QVLTVTRLIS AE IEKFYVS LDLMNIGVQP IRRSKSLQCL RDPSKKSFVK QLFNDFLYQM KEYGIYAASI AIISLIVEFD IKRRQAETLS VKL MHRTAL TLCEKIRHLL VQKLQDMTYD DDDDNVNTEE VIMNFSTPKV QRFLMSLKVS FADKDPKDIC CLVFVERRYT CKCI YGLLL NYIQSTPELR NVLTPQFMVG RNNISPDFES VLERKWQKSA IQQFRDGNAN LMICSSVLEE GIDVQACNHV FILDP VKTF NMYVQSKGRA RTTEAKFVLF TADKEREKTI QQIYQYRKAH NDIAEYLKDR VLEKTEPELY EIKGHFQDDI DPFTNE NGA VLLPNNALAI LHRYCQTIPT DAFGFVIPWF HVLQEDERDR IFGVSAKGKH VISINMPVNC MLRDTIYSDP MDNVKTA KI SAAFKACKVL YSLGELNERF VPKTLKERVA SIADVHFEHW NKYGDSVTAT VNKADKSKDR TYKTECPLEF YDALPRVG E ICYAYEIFLE PQFESCEYTE HMYLNLQTPR NYAILLRNKL PRLAEMPLFS NQGKLHVRVA NAPLEVIIQN SEQLELLHQ FHGMVFRDIL KIWHPFFVLD RRSKENSYLV VPLILGAGEQ KCFDWELMTN FRRLPQSHGS NVQQREQQPA PRPEDFEGKI VTQWYANYD KPMLVTKVHR ELTPLSYMEK NQQDKTYYEF TMSKYGNRIG DVVHKDKFMI EVRDLTEQLT FYVHNRGKFN A KSKAKMKV ILIPELCFNF NFPGDLWLKL IFLPSILNRM YFLLHAEALR KRFNTYLNLH LLPFNGTDYM PRPLEIDYSL KR NVDPLGN VIPTEDIEEP KSLLEPMPTK SIEASVANLE ITEFENPWQK YMEPVDLSRN LLSTYPVELD YYYHFSVGNV CEM NEMDFE DKEYWAKNQF HMPTGNIYGN RTPAKTNANV PALMPSKPTV RGKVKPLLIL QKTVSKEHIT PAEQGEFLAA ITAS SAADV FDMERLEILG NSFLKLSATL YLASKYSDWN EGTLTEVKSK LVSNRNLLFC LIDADIPKTL NTIQFTPRYT WLPPG ISLP HNVLALWREN PEFAKIIGPH NLRDLALGDE ESLVKGNCSD INYNRFVEGC RANGQSFYAG ADFSSEVNFC VGLVTI PNK VIADTLEALL GVIVKNYGLQ HAFKMLEYFK ICRADIDKPL TQLLNLELGG KKMRANVNTT EIDGFLINHY YLEKNLG YT FKDRRYLLQA LTHPSYPTNR ITGSYQELEF IGNAILDFLI SAYIFENNTK MNPGALTDLR SALVNNTTLA CICVRHRL H FFILAENAKL SEIISKFVNF QESQGHRVTN YVRILLEEAD VQPTPLDLDD ELDMTELPHA NKCISQEAEK GVPPKGEFN MSTNVDVPKA LGDVLEALIA AVYLDCRDLQ RTWEVIFNLF EPELQEFTRK VPINHIRQLV EHKHAKPVFS SPIVEGETVM VSCQFTCME KTIKVYGFGS NKDQAKLSAA KHALQQLSKC DA

UniProtKB: Endoribonuclease Dcr-2

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Macromolecule #3: slm1

MacromoleculeName: slm1 / type: rna / ID: 3 / Number of copies: 1
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 30.660104 KDa
SequenceString:
GUAGCAUGAU CAUCCGAAUC CUCUACAACG AUUUUUUCCC CAUUAUUGAA UAAUGGCAAA AAAUCCUUGU AGUGGAUUCG GAUGAUAAU GCUACUG

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Macromolecule #4: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 4 / Number of copies: 2 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #5: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 1 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

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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 %

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOCONTINUUM (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 0.01 mm / Nominal defocus max: 1.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.08 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 78861
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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Atomic model buiding 1

RefinementProtocol: RIGID BODY FIT
Output model

PDB-8yih:
DmDcr-2/LoqsPD/slm1 in pre-dicing state

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