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- PDB-11gi: Human Argonaute2 WT - guide(3 prime-amino) RNA in complex with a ... -

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Basic information

Entry
Database: PDB / ID: 11gi
TitleHuman Argonaute2 WT - guide(3 prime-amino) RNA in complex with a fully complementary target
Components
  • Argonaute2 WT
  • guide(3 prime-amino) RNA
  • target RNA
KeywordsRNA BINDING PROTEIN/RNA / RNA binding protein / RNP / RNA / Argonaute2 / Ago2 / RNA BINDING PROTEIN-RNA complex
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 / 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 / miRNA-mediated gene silencing by mRNA destabilization ...: / endoribonuclease activity, cleaving miRNA-paired mRNA / endoribonuclease activity, cleaving siRNA-paired mRNA / siRNA-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 / miRNA-mediated gene silencing by mRNA destabilization / negative regulation of amyloid precursor protein biosynthetic process / RNA stabilization / Small interfering RNA (siRNA) biogenesis / Regulation of CDH1 mRNA translation by microRNAs / 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-mediated gene silencing by inhibition of translation / miRNA processing / RNA 7-methylguanosine cap binding / pre-miRNA processing / regulation of synapse maturation / siRNA binding / mRNA 3'-UTR AU-rich region binding / M-decay: degradation of maternal mRNAs by maternally stored factors / siRNA processing / Regulation of MITF-M-dependent genes involved in apoptosis / RISC complex / TGFBR3 expression / regulatory ncRNA-mediated gene silencing / Regulation of RUNX1 Expression and Activity / P-body assembly / miRNA binding / 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 / NR1H3 & NR1H2 regulate gene expression linked to cholesterol transport and efflux / Nuclear events stimulated by ALK signaling in cancer / RNA endonuclease activity / translation initiation factor activity / negative regulation of translational initiation / post-embryonic development / TP53 Regulates Metabolic Genes / positive regulation of translation / Transcriptional regulation by small RNAs / P-body / MAPK6/MAPK4 signaling / Pre-NOTCH Transcription and Translation / positive regulation of angiogenesis / cytoplasmic ribonucleoprotein granule / 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 / membrane / metal ion binding / nucleus / 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 / RNA (> 10) / Protein argonaute-2
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsSarkar, S. / Gebert, L.F.R. / MacRae, I.J.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)5R35GM127090 United States
CitationJournal: Nat Struct Mol Biol / Year: 2026
Title: Catalytic activation of human Argonaute 2 requires RNA duplex deformation.
Authors: Sucharita Sarkar / Luca F R Gebert / Ian J MacRae /
Abstract: Small interfering RNAs (siRNAs) are an expanding class of RNA therapeutics, with seven drugs approved by the US Food and Drug Administration and many more in development. Rational design, however, ...Small interfering RNAs (siRNAs) are an expanding class of RNA therapeutics, with seven drugs approved by the US Food and Drug Administration and many more in development. Rational design, however, has been limited by incomplete understanding of how human Argonaute 2 (hAgo2) catalyzes target cleavage. Here we report high-resolution cryo-electron microscopy structures of hAgo2 bound to a target RNA in catalytic and noncatalytic conformations. The structures reveal that guide-target pairing alone is insufficient for slicing and catalysis requires deformation of the duplex through a coordinated network of RNA-protein interactions. Expansion of the central major groove positions the scissile phosphate, while compression toward the supplementary region docks the duplex into the hAgo2 cleft. A kink after guide nucleotide g6 disrupts seed-only pairing conformation and promotes the extended pairing required for catalysis. This rearrangement enables repositioning of K709 within the active site, while a pyrimidine at target position t10 optimally aligns R710 to accelerate cleavage. These findings provide a structural framework linking siRNA duplex geometry to catalytic efficiency and inform rational design of siRNAs with improved potency and specificity.
History
DepositionFeb 23, 2026Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 13, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Argonaute2 WT
B: guide(3 prime-amino) RNA
C: target RNA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)111,1674
Polymers111,1423
Non-polymers241
Water362
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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


Mass: 97402.195 Da / Num. of mol.: 1 / Mutation: S387D, S824A, S828D, S831D, S834A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: AGO2, EIF2C2 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: Q9UKV8, Hydrolases; Acting on ester bonds; Endoribonucleases producing 5'-phosphomonoesters
#2: RNA chain guide(3 prime-amino) RNA


Mass: 6481.856 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#3: RNA chain target RNA


Mass: 7258.423 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationN

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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: human Argonaute-2 - miR-122(3'-amino) in complex with a fully complementary target
Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
150 mMTRISTRIS1
2100 mMNaClNaCl1
30.5 mMTCEPTCEP1
SpecimenConc.: 1.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 190000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3.2 sec. / Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 6 / Num. of real images: 20132
Image scansWidth: 4096 / Height: 4096

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.7particle selection
2EPUimage acquisition
4cryoSPARC4.7CTF correction
7UCSF ChimeraX1.7.1model fitting
11cryoSPARC4.7classification
12cryoSPARC4.73D reconstruction
13PHENIX1.20.1model refinement
14Coot0.9.8.1model refinement
15UCSF ChimeraX1.7.1model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 207140 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 6N4O

6n4o


Pdb chain-ID: A / Accession code: 6N4O / Source name: PDB / Type: experimental model

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