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- EMDB-5603: Substrate-specific structural rearrangements of human Dicer -

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Basic information

Entry
Database: EMDB / ID: EMD-5603
TitleSubstrate-specific structural rearrangements of human Dicer
Map dataZernike phase-contrast cryo-EM reconstruction of Dicer-pre-let7
Sample
  • Sample: Human Dicer in complex with pre-let7
  • Protein or peptide: Endoribonuclease Dicer
  • Other: pre-let7
KeywordsRNA-mediated gene silencing / pre-miRNA processing / RNaseIII
Function / homology
Function and homology information


peripheral nervous system myelin formation / global gene silencing by mRNA cleavage / pre-miRNA binding / tRNA-derived small RNA (tsRNA or tRNA-related fragment, tRF) biogenesis / Small interfering RNA (siRNA) biogenesis / negative regulation of Schwann cell proliferation / tRNA decay / apoptotic DNA fragmentation / positive regulation of myelination / ribonuclease III ...peripheral nervous system myelin formation / global gene silencing by mRNA cleavage / pre-miRNA binding / tRNA-derived small RNA (tsRNA or tRNA-related fragment, tRF) biogenesis / Small interfering RNA (siRNA) biogenesis / negative regulation of Schwann cell proliferation / tRNA decay / apoptotic DNA fragmentation / positive regulation of myelination / ribonuclease III / deoxyribonuclease I activity / positive regulation of Schwann cell differentiation / nerve development / RISC-loading complex / miRNA metabolic process / RISC complex assembly / ribonuclease III activity / miRNA processing / pre-miRNA processing / siRNA processing / siRNA binding / Regulation of MITF-M-dependent genes involved in apoptosis / M-decay: degradation of maternal mRNAs by maternally stored factors / RISC complex / MicroRNA (miRNA) biogenesis / negative regulation of tumor necrosis factor production / negative regulation of tumor necrosis factor-mediated signaling pathway / RNA endonuclease activity / neuron projection morphogenesis / helicase activity / double-stranded RNA binding / protein domain specific binding / negative regulation of gene expression / perinuclear region of cytoplasm / negative regulation of transcription by RNA polymerase II / RNA binding / extracellular exosome / ATP binding / nucleus / metal ion binding / cytosol / cytoplasm
Similarity search - Function
: / Dicer, double-stranded RNA-binding domain / : / Dicer, partner-binding domain / Dicer, dsRNA-binding domain / : / Dicer, platform domain / Dicer dimerisation domain / Dicer dimerisation domain / Dicer dimerisation domain superfamily ...: / Dicer, double-stranded RNA-binding domain / : / Dicer, partner-binding domain / Dicer, dsRNA-binding domain / : / Dicer, platform domain / Dicer dimerisation domain / Dicer dimerisation domain / Dicer dimerisation domain superfamily / Dicer dimerisation domain / Dicer double-stranded RNA-binding fold domain profile. / Ribonuclease III family signature. / Ribonuclease III domain / Ribonuclease III family domain profile. / Ribonuclease III family / Ribonuclease III domain / Ribonuclease III domain / PAZ domain superfamily / PAZ / PAZ domain / PAZ domain profile. / PAZ domain / PAZ domain / Double-stranded RNA binding motif / Ribonuclease III, endonuclease domain superfamily / Double stranded RNA-binding domain (dsRBD) profile. / Double-stranded RNA-binding domain / Double-stranded RNA-binding domain / DEAD/DEAH box helicase 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, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Helicase superfamily 1/2, ATP-binding domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Endoribonuclease Dicer
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 31.0 Å
AuthorsTaylor DW / Ma E / Shigematsu H / Cianfrocco MA / Noland CL / Nagayama K / Nogales E / Doudna JA / Wang HW
CitationJournal: Nat Struct Mol Biol / Year: 2013
Title: Substrate-specific structural rearrangements of human Dicer.
Authors: David W Taylor / Enbo Ma / Hideki Shigematsu / Michael A Cianfrocco / Cameron L Noland / Kuniaki Nagayama / Eva Nogales / Jennifer A Doudna / Hong-Wei Wang /
Abstract: Dicer has a central role in RNA-interference pathways by cleaving double-stranded RNAs (dsRNAs) to produce small regulatory RNAs. Human Dicer can process long double-stranded and hairpin precursor ...Dicer has a central role in RNA-interference pathways by cleaving double-stranded RNAs (dsRNAs) to produce small regulatory RNAs. Human Dicer can process long double-stranded and hairpin precursor RNAs to yield short interfering RNAs (siRNAs) and microRNAs (miRNAs), respectively. Previous studies have shown that pre-miRNAs are cleaved more rapidly than pre-siRNAs in vitro and are the predominant natural Dicer substrates. We have used EM and single-particle analysis of Dicer-RNA complexes to gain insight into the structural basis for human Dicer's substrate preference. Our studies show that Dicer traps pre-siRNAs in a nonproductive conformation, whereas interactions of Dicer with pre-miRNAs and dsRNA-binding proteins induce structural changes in the enzyme that enable productive substrate recognition in the central catalytic channel. These findings implicate RNA structure and cofactors in determining substrate recognition and processing efficiency by human Dicer.
History
DepositionMar 9, 2013-
Header (metadata) releaseMar 20, 2013-
Map releaseMay 1, 2013-
UpdateJun 19, 2013-
Current statusJun 19, 2013Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 2.95
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 2.95
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_5603.png

Downloads & links

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Map

FileDownload / File: emd_5603.map.gz / Format: CCP4 / Size: 2.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationZernike phase-contrast cryo-EM reconstruction of Dicer-pre-let7
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
3.07 Å/pix.
x 90 pix.
= 276.3 Å		3.07 Å/pix.
x 90 pix.
= 276.3 Å		3.07 Å/pix.
x 90 pix.
= 276.3 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 3.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 2.95 / Movie #1: 2.95
Minimum - Maximum-3.64101529 - 15.15398693
Average (Standard dev.)0.0 (±0.99999934)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions909090
Spacing909090
CellA=B=C: 276.3 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z3.073.073.07
M x/y/z909090
origin x/y/z0.0000.0000.000
length x/y/z276.300276.300276.300
α/β/γ90.00090.00090.000
start NX/NY/NZ-132-122-147
NX/NY/NZ250274261
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS909090
D min/max/mean-3.64115.1540.000

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Supplemental data

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Sample components

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Entire : Human Dicer in complex with pre-let7

EntireName: Human Dicer in complex with pre-let7
Components
  • Sample: Human Dicer in complex with pre-let7
  • Protein or peptide: Endoribonuclease Dicer
  • Other: pre-let7

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Supramolecule #1000: Human Dicer in complex with pre-let7

SupramoleculeName: Human Dicer in complex with pre-let7 / type: sample / ID: 1000 / Oligomeric state: monomer / Number unique components: 2
Molecular weightTheoretical: 250 KDa

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Macromolecule #1: Endoribonuclease Dicer

MacromoleculeName: Endoribonuclease Dicer / type: protein_or_peptide / ID: 1 / Name.synonym: Dicer, Helicase with RNase motif / Number of copies: 1 / Oligomeric state: monomer / Recombinant expression: Yes / Database: NCBI
Source (natural)Organism: Homo sapiens (human) / synonym: Human
Molecular weightTheoretical: 220 KDa
SequenceUniProtKB: Endoribonuclease Dicer / GO: pre-miRNA processing
InterPro: Ribonuclease III domain, PAZ domain, Helicase, C-terminal, Helicase superfamily 1/2, ATP-binding domain, Double-stranded RNA-binding domain, INTERPRO: IPR001159, DEAD/DEAH box helicase ...InterPro: Ribonuclease III domain, PAZ domain, Helicase, C-terminal, Helicase superfamily 1/2, ATP-binding domain, Double-stranded RNA-binding domain, INTERPRO: IPR001159, DEAD/DEAH box helicase domain, Dicer dimerisation domain

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Macromolecule #2: pre-let7

MacromoleculeName: pre-let7 / type: other / ID: 2 / Classification: OTHER_NA / Structure: SINGLE STRANDED / Synthetic?: No
Source (natural)Organism: Homo sapiens (human) / synonym: Human
Molecular weightTheoretical: 24 KDa
SequenceString:
UGAGGUAGUA GGUUGUAUAG UUUUAGGGUC ACACCCACCA CUGGGAGAUA ACUAUACAAU CUACUGUCUU ACC

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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

Concentration0.05 mg/mL
BufferpH: 7.4
Details: 20 mM HEPES, pH 7.5, 150 mM KCl, 3 mM EDTA, 1 mM DTT, and 2.5% glycerol
GridDetails: glow-discharged Quantifoil R 1.2/1.3 MO 200 mesh holey carbon grids
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK IV
Method: The samples were automatically blotted for 4-5 s at -2.5 mm offset before plunging.

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Electron microscopy

MicroscopeJEOL 3100FFC
TemperatureMin: 45 K / Max: 60 K / Average: 55 K
Alignment procedureLegacy - Astigmatism: Objective lens astigmatism was corrected at 100,000 times magnification
Specialist opticsEnergy filter - Name: JEOL / Energy filter - Lower energy threshold: 0.0 eV / Energy filter - Upper energy threshold: 20.0 eV
DateJan 10, 2010
Image recordingCategory: CCD / Film or detector model: GENERIC GATAN (2k x 2k) / Number real images: 800 / Average electron dose: 20 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 100000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 3.7 mm / Nominal defocus max: 0.0 µm / Nominal defocus min: 0.0 µm / Nominal magnification: 60000
Sample stageSpecimen holder: Liquid helium cooled stage maintained at 55 K
Specimen holder model: JEOL

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Image processing

CTF correctionDetails: each micrograph
Final reconstructionAlgorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 31.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EMAN2/SPARX / Number images used: 4100

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