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- EMDB-7291: Drosophila Dicer-2 apo homology model (helicase, Platform-PAZ, RN... -

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Basic information

Entry
Database: EMDB / ID: EMD-7291
TitleDrosophila Dicer-2 apo homology model (helicase, Platform-PAZ, RNaseIII domains)
Map dataDrosophila Dicer-2 (apo)
Sample
  • Complex: Drosophila Dicer-2 (apo)
    • Protein or peptide: Dicer-2, isoform A
KeywordsDicer / dmDcr2 / Dicer-2 / helicase / platform / PAZ / RNAseIII / RNA BINDING PROTEIN
Function / homology
Function and homology information


positive regulation of Toll signaling pathway / lncRNA catabolic process / RNAi-mediated antiviral immune response / dsRNA transport / dosage compensation by hyperactivation of X chromosome / global gene silencing by mRNA cleavage / apoptotic DNA fragmentation / ribonuclease III / deoxyribonuclease I activity / RISC-loading complex ...positive regulation of Toll signaling pathway / lncRNA catabolic process / RNAi-mediated antiviral immune response / dsRNA transport / dosage compensation by hyperactivation of X chromosome / global gene silencing by mRNA cleavage / apoptotic DNA fragmentation / ribonuclease III / deoxyribonuclease I activity / RISC-loading complex / detection of virus / RISC complex assembly / regulatory ncRNA-mediated post-transcriptional gene silencing / ribonuclease III activity / siRNA processing / siRNA binding / positive regulation of innate immune response / ATP-dependent activity, acting on RNA / RISC complex / positive regulation of defense response to virus by host / mRNA 3'-UTR binding / locomotory behavior / helicase activity / cellular response to virus / heterochromatin formation / cytoplasmic ribonucleoprotein granule / defense response to virus / perinuclear region of cytoplasm / ATP hydrolysis activity / RNA binding / ATP binding / nucleus / 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 / Ribonuclease III domain ...: / 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 / 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
Similarity search - Component
Biological speciesDrosophila melanogaster (fruit fly)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.1 Å
AuthorsShen PS / Sinha NK
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM121706 United States
CitationJournal: Science / Year: 2018
Title: Dicer uses distinct modules for recognizing dsRNA termini.
Authors: Niladri K Sinha / Janet Iwasa / Peter S Shen / Brenda L Bass /
Abstract: Invertebrates rely on Dicer to cleave viral double-stranded RNA (dsRNA), and Dicer-2 distinguishes dsRNA substrates by their termini. Blunt termini promote processive cleavage, while 3' overhanging ...Invertebrates rely on Dicer to cleave viral double-stranded RNA (dsRNA), and Dicer-2 distinguishes dsRNA substrates by their termini. Blunt termini promote processive cleavage, while 3' overhanging termini are cleaved distributively. To understand this discrimination, we used cryo-electron microscopy to solve structures of Dicer-2 alone and in complex with blunt dsRNA. Whereas the Platform-PAZ domains have been considered the only Dicer domains that bind dsRNA termini, unexpectedly, we found that the helicase domain is required for binding blunt, but not 3' overhanging, termini. We further showed that blunt dsRNA is locally unwound and threaded through the helicase domain in an adenosine triphosphate-dependent manner. Our studies reveal a previously unrecognized mechanism for optimizing antiviral defense and set the stage for the discovery of helicase-dependent functions in other Dicers.
History
DepositionDec 9, 2017-
Header (metadata) releaseDec 27, 2017-
Map releaseDec 27, 2017-
UpdateMar 13, 2024-
Current statusMar 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6bua
  • Surface level: 0.013
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_7291.png

Downloads & links

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Map

FileDownload / File: emd_7291.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationDrosophila Dicer-2 (apo)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.19 Å/pix.
x 256 pix.
= 305.408 Å		1.19 Å/pix.
x 256 pix.
= 305.408 Å		1.19 Å/pix.
x 256 pix.
= 305.408 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.193 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.013 / Movie #1: 0.013
Minimum - Maximum-0.0038245027 - 0.030697713
Average (Standard dev.)-0.000031299314 (±0.0012950517)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 305.408 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.1931.1931.193
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z305.408305.408305.408
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.0040.031-0.000

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Supplemental data

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Sample components

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Entire : Drosophila Dicer-2 (apo)

EntireName: Drosophila Dicer-2 (apo)
Components
  • Complex: Drosophila Dicer-2 (apo)
    • Protein or peptide: Dicer-2, isoform A

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Supramolecule #1: Drosophila Dicer-2 (apo)

SupramoleculeName: Drosophila Dicer-2 (apo) / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Drosophila melanogaster (fruit fly)

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Macromolecule #1: Dicer-2, isoform A

MacromoleculeName: Dicer-2, isoform A / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: ribonuclease III
Source (natural)Organism: Drosophila melanogaster (fruit fly)
Molecular weightTheoretical: 198.074797 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GPMEDVEIKP RGYQLRLVDH LTKSNGIVYL PTGSGKTFVA ILVLKRFSQD FDKPIESGGK RALFMCNTVE LARQQAMAVR RCTNFKVGF YVGEQGVDDW TRGMWSDEIK KNQVLVGTAQ VFLDMVTQTY VALSSLSVVI IDECHHGTGH HPFREFMRLF T IANQTKLP ...String:
GPMEDVEIKP RGYQLRLVDH LTKSNGIVYL PTGSGKTFVA ILVLKRFSQD FDKPIESGGK RALFMCNTVE LARQQAMAVR RCTNFKVGF YVGEQGVDDW TRGMWSDEIK KNQVLVGTAQ VFLDMVTQTY VALSSLSVVI IDECHHGTGH HPFREFMRLF T IANQTKLP RVVGLTGVLI KGNEITNVAT KLKELEITYR GNIITVSDTK EMENVMLYAT KPTEVMVSFP HQEQVLTVTR LI SAEIEKF YVSLDLMNIG VQPIRRSKSL QCLRDPSKKS FVKQLFNDFL YQMKEYGIYA ASIAIISLIV EFDIKRRQAE TLS VKLMHR TALTLCEKIR HLLVQKLQDM TYDDDDDNVN TEEVIMNFST PKVQRFLMSL KVSFADKDPK DICCLVFVER RYTC KCIYG LLLNYIQSTP ELRNVLTPQF MVGRNNISPD FESVLERKWQ KSAIQQFRDG NANLMICSSV LEEGIDVQAC NHVFI LDPV KTFNMYVQSK GRARTTEAKF VLFTADKERE KTIQQIYQYR KAHNDIAEYL KDRVLEKTEP ELYEIKGHFQ DDIDPF TNE NGAVLLPNNA LAILHRYCQT IPTDAFGFVI PWFHVLQEDE RDRIFGVSAK GKHVISINMP VNCMLRDTIY SDPMDNV KT AKISAAFKAC KVLYSLGELN ERFVPKTLKE RVASIADVHF EHWNKYGDSV TATVNKADKS KDRTYKTECP LEFYDALP R VGEICYAYEI FLEPQFESCE YTEHMYLNLQ TPRNYAILLR NKLPRLAEMP LFSNQGKLHV RVANAPLEVI IQNSEQLEL LHQFHGMVFR DILKIWHPFF VLDRRSKENS YLVVPLILGA GEQKCFDWEL MTNFRRLPQS HGSNVQQREQ QPAPRPEDFE GKIVTQWYA NYDKPMLVTK VHRELTPLSY MEKNQQDKTY YEFTMSKYGN RIGDVVHKDK FMIEVRDLTE QLTFYVHNRG K FNAKSKAK MKVILIPELC FNFNFPGDLW LKLIFLPSIL NRMYFLLHAE ALRKRFNTYL NLHLLPFNGT DYMPRPLEID YS LKRNVDP LGNVIPTEDI EEPKSLLEPM PTKSIEASVA NLEITEFENP WQKYMEPVDL SRNLLSTYPV ELDYYYHFSV GNV CEMNEM DFEDKEYWAK NQFHMPTGNI YGNRTPAKTN ANVPALMPSK PTVRGKVKPL LILQKTVSKE HITPAEQGEF LAAI TASSA ADVFDMERLE ILGASFLKLS ATLYLASKYS DWNEGTLTEV KSKLVSNRNL LFCLIDADIP KTLNTIQFTP RYTWL PPGI SLPHNVLALW RENPEFAKII GPHNLRDLAL GDEESLVKGN CSDINYNRFV EGCRANGQSF YAGADFSSEV NFCVGL VTI PNKVIADTLE ALLGVIVKNY GLQHAFKMLE YFKICRADID KPLTQLLNLE LGGKKMRANV NTTEIDGFLI NHYYLEK NL GYTFKDRRYL LQALTHPSYP TNRITGSYQE LEFIGAAILD FLISAYIFEN NTKMNPGALT DLRSALVNNT TLACICVR H RLHFFILAEN AKLSEIISKF VNFQESQGHR VTNYVRILLE EADVQPTPLD LDDELDMTEL PHANKCISQE AEKGVPPKG EFNMSTNVDV PKALGDVLEA LIAAVYLDCR DLQRTWEVIF NLFEPELQEF TRKVPINHIR QLVEHKHAKP VFSSPIVEGE TVMVSCQFT CMEKTIKVYG FGSNKDQAKL SAAKHALQQL SKCDA

UniProtKB: Endoribonuclease Dcr-2

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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

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TECNAI F20
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 1.2 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

4a36

Final reconstructionResolution.type: BY AUTHOR / Resolution: 7.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 85119
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: ANGULAR RECONSTITUTION

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