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- PDB-9k6p: Cryo-EM Structure of hAGO2D669A-siRNA-target (12-nt) -

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Basic information

Entry
Database: PDB / ID: 9k6p
TitleCryo-EM Structure of hAGO2D669A-siRNA-target (12-nt)
Components
  • Protein argonaute-2
  • RNA (5'-R(P*GP*GP*CP*UP*CP*UP*UP*GP*U)-3')
  • RNA (5'-R(P*UP*AP*CP*AP*AP*GP*AP*GP*CP*C)-3')
KeywordsRNA BINDING PROTEIN / Argonaute protein / siRNA / RNA BINDING PROTEIN/RNA
Function / homology
Function and homology information


: / endoribonuclease activity, cleaving miRNA-paired mRNA / endoribonuclease activity, cleaving siRNA-paired mRNA / siRNA-mediated gene silencing by mRNA destabilization / miRNA-mediated gene silencing by mRNA destabilization / Post-transcriptional silencing by small RNAs / Competing endogenous RNAs (ceRNAs) regulate PTEN translation / Regulation of CDH11 mRNA translation by microRNAs / Regulation of NPAS4 mRNA translation / Regulation of PTEN mRNA translation ...: / endoribonuclease activity, cleaving miRNA-paired mRNA / endoribonuclease activity, cleaving siRNA-paired mRNA / siRNA-mediated gene silencing by mRNA destabilization / miRNA-mediated gene silencing by mRNA destabilization / Post-transcriptional silencing by small RNAs / Competing endogenous RNAs (ceRNAs) regulate PTEN translation / Regulation of CDH11 mRNA translation by microRNAs / Regulation of NPAS4 mRNA translation / Regulation of PTEN mRNA translation / negative regulation of amyloid precursor protein biosynthetic process / Small interfering RNA (siRNA) biogenesis / positive regulation of trophoblast cell migration / Transcriptional Regulation by MECP2 / RISC-loading complex / miRNA metabolic process / mRNA cap binding / RISC complex assembly / regulatory ncRNA-mediated post-transcriptional gene silencing / miRNA processing / miRNA-mediated gene silencing by inhibition of translation / pre-miRNA processing / RNA 7-methylguanosine cap binding / siRNA processing / siRNA binding / regulation of synapse maturation / mRNA 3'-UTR AU-rich region binding / M-decay: degradation of maternal mRNAs by maternally stored factors / Regulation of MITF-M-dependent genes involved in apoptosis / RISC complex / regulatory ncRNA-mediated gene silencing / TGFBR3 expression / Regulation of RUNX1 Expression and Activity / miRNA binding / P-body assembly / MicroRNA (miRNA) biogenesis / positive regulation of nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / positive regulation of nuclear-transcribed mRNA poly(A) tail shortening / RNA polymerase II complex binding / Regulation of MECP2 expression and activity / core promoter sequence-specific DNA binding / Nuclear events stimulated by ALK signaling in cancer / NR1H3 & NR1H2 regulate gene expression linked to cholesterol transport and efflux / translation initiation factor activity / negative regulation of translational initiation / RNA endonuclease activity / positive regulation of translation / post-embryonic development / TP53 Regulates Metabolic Genes / P-body / Transcriptional regulation by small RNAs / MAPK6/MAPK4 signaling / Pre-NOTCH Transcription and Translation / cytoplasmic ribonucleoprotein granule / positive regulation of angiogenesis / double-stranded RNA binding / Ca2+ pathway / Estrogen-dependent gene expression / single-stranded RNA binding / postsynapse / translation / dendrite / glutamatergic synapse / positive regulation of transcription by RNA polymerase II / RNA binding / extracellular exosome / nucleoplasm / metal ion binding / nucleus / membrane / cytoplasm / cytosol
Similarity search - Function
Protein argonaute-2 / Protein argonaute, Mid domain / Mid domain of argonaute / Argonaute linker 2 domain / Protein argonaute, N-terminal / Argonaute-like, PIWI domain / N-terminal domain of argonaute / Argonaute linker 2 domain / DUF1785 / Argonaute, linker 1 domain ...Protein argonaute-2 / Protein argonaute, Mid domain / Mid domain of argonaute / Argonaute linker 2 domain / Protein argonaute, N-terminal / Argonaute-like, PIWI domain / N-terminal domain of argonaute / Argonaute linker 2 domain / DUF1785 / Argonaute, linker 1 domain / Argonaute linker 1 domain / Piwi domain profile. / Piwi domain / Piwi domain / Piwi / PAZ domain superfamily / PAZ / PAZ domain / PAZ domain profile. / PAZ domain / Ribonuclease H superfamily / Ribonuclease H-like superfamily
Similarity search - Domain/homology
RNA / Protein argonaute-2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsLi, Z.Z. / Xu, Q.K. / Wu, J.P. / Shen, E.Z.
Funding support1items
OrganizationGrant numberCountry
Other private
CitationJournal: Cell Res / Year: 2025
Title: Mechanistic insights into RNA cleavage by human Argonaute2-siRNA complex.
Authors: Zhenzhen Li / Qikui Xu / Yan Zhang / Jing Zhong / Tianxiang Zhang / Junchao Xue / Shuxian Liu / Haishan Gao / Z Z Zhao Zhang / Jianping Wu / En-Zhi Shen /
Abstract: In animals, AGO-clade Argonaute proteins utilize small interfering RNAs (siRNAs) as guides to recognize target with complete complementarity, resulting in target RNA cleavage that is a critical step ...In animals, AGO-clade Argonaute proteins utilize small interfering RNAs (siRNAs) as guides to recognize target with complete complementarity, resulting in target RNA cleavage that is a critical step for target silencing. These proteins feature a constricted nucleic acid-binding channel that limits base pairing between the guide and target beyond the seed region. How the AGO-siRNA complexes overcome this structural limitation and achieve efficient target cleavage remains unclear. We performed cryo-electron microscopy of human AGO-siRNA complexes bound to target RNAs of increasing lengths to examine the conformational changes associated with target recognition and cleavage. Initially, conformational transition propagates from the opening of the PAZ domain and extends through a repositioning of the PIWI-L1-N domain toward the binding channel, facilitating the capture of siRNA-target duplex. Subsequent extension of base pairing drives the downward movement of the PIWI-L1-N domain to enable catalytic activation. Finally, further base pairing toward the 3' end of siRNA destabilizes the PAZ-N domain, resulting in a "uni-lobed" architecture, which might facilitate the multi-turnover action of the AGO-siRNA enzyme complex. In contrast to PIWI-clade Argonautes, the "uni-lobed" structure of the AGO complex makes multiple contacts with the target in the central region of the siRNA-target duplex, positioning it within the catalytic site. Our findings shed light on the stepwise mechanisms by which the AGO-siRNA complex executes target RNA cleavage and offer insights into the distinct operational modalities of AGO and PIWI proteins in achieving such cleavage.
History
DepositionOct 22, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 25, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Protein argonaute-2
B: RNA (5'-R(P*UP*AP*CP*AP*AP*GP*AP*GP*CP*C)-3')
C: RNA (5'-R(P*GP*GP*CP*UP*CP*UP*UP*GP*U)-3')


Theoretical massNumber of molelcules
Total (without water)103,3163
Polymers103,3163
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Protein argonaute-2 / Argonaute2 / hAgo2 / Argonaute RISC catalytic component 2 / Eukaryotic translation initiation ...Argonaute2 / hAgo2 / Argonaute RISC catalytic component 2 / Eukaryotic translation initiation factor 2C 2 / eIF-2C 2 / eIF2C 2 / PAZ Piwi domain protein / PPD / Protein slicer


Mass: 97306.164 Da / Num. of mol.: 1 / Mutation: D669A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: AGO2, EIF2C2 / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
References: UniProt: Q9UKV8, Hydrolases; Acting on ester bonds; Endoribonucleases producing 5'-phosphomonoesters
#2: RNA chain RNA (5'-R(P*UP*AP*CP*AP*AP*GP*AP*GP*CP*C)-3')


Mass: 3183.989 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
#3: RNA chain RNA (5'-R(P*GP*GP*CP*UP*CP*UP*UP*GP*U)-3')


Mass: 2825.687 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Cell line (production host): HEK293 / Production host: Homo sapiens (human)
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Complex of hAGO2D669A-siRNA-target (12-nt) / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 35278 / Symmetry type: POINT

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