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- PDB-9l8n: Structure of SID-1 -

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Basic information

Entry
Database: PDB / ID: 9l8n
TitleStructure of SID-1
ComponentsSystemic RNA interference defective protein 1
KeywordsMEMBRANE PROTEIN
Function / homology
Function and homology information


dsRNA transport / RNA transmembrane transporter activity / RNA transport / regulatory ncRNA-mediated post-transcriptional gene silencing / double-stranded RNA binding / lysosome / membrane / plasma membrane
Similarity search - Function
SID1 transmembrane family / dsRNA-gated channel SID-1
Similarity search - Domain/homology
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / CHOLESTEROL HEMISUCCINATE / Systemic RNA interference defective protein 1
Similarity search - Component
Biological speciesCaenorhabditis elegans (invertebrata)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsKumazaki, K. / Kusakizako, T. / Nishizawa, T. / Nureki, O.
Funding support Japan, 3items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)JP21H05037 Japan
Japan Science and TechnologyJPMJCR20E2 Japan
Japan Agency for Medical Research and Development (AMED)JP19am01011115 Japan
CitationJournal: To Be Published
Title: Structural insights into SID1-mediated dsRNA uptake: A self-organizing endocytic mechanism
Authors: Takai, A. / Kumazaki, K. / Awazu, T. / Kambara, T. / Murakoshi, S. / Kato, T. / Hiraizumi, M. / Kise, Y. / Kusakizako, T. / Nishizawa, T. / Okada, T. / Nureki, O.
History
DepositionDec 27, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 21, 2026Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: Mask / Part number: 1 / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0Jan 21, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Systemic RNA interference defective protein 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)89,3418
Polymers86,1991
Non-polymers3,1427
Water00
1
A: Systemic RNA interference defective protein 1
hetero molecules

A: Systemic RNA interference defective protein 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)178,68316
Polymers172,3982
Non-polymers6,28514
Water0
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
point symmetry operation1
Noncrystallographic symmetry (NCS)NCS oper:
IDCodeMatrixVector
1given(1), (1), (1)
2generate(-1), (-1), (1)212.48, 212.48

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Components

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Protein , 1 types, 1 molecules A

#1: Protein Systemic RNA interference defective protein 1 / Systemic RNAi enabling protein


Mass: 86199.133 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Caenorhabditis elegans (invertebrata) / Gene: sid-1, rde-7, rsd-8, C04F5.1 / Production host: Homo sapiens (human) / References: UniProt: Q9GZC8

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Sugars , 2 types, 3 molecules

#2: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}}LINUCSPDB-CARE
#3: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 4 molecules

#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#5: Chemical ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C31H50O4
#6: Chemical ChemComp-LBN / 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / (2R)-2-[(9Z)-9-Octadecenoyloxy]-3-(palmitoyloxy)propyl 2-(trimethylammonio)ethyl phosphate


Mass: 760.076 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C42H82NO8P / Comment: phospholipid*YM

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Details

Has ligand of interestN
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: SID-1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.086 MDa / Experimental value: NO
Source (natural)Organism: Caenorhabditis elegans (invertebrata)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %

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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 magnification: 105000 X / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 2.6 sec. / Electron dose: 49.6 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2476
EM imaging opticsEnergyfilter name: GIF Bioquantum

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Processing

EM software
IDNameVersionCategory
1RELION3.1particle selection
2SerialEMimage acquisition
4RELION3.1CTF correction
7Coot0.9.8.1model fitting
9RELION3.1initial Euler assignment
10RELION3.1final Euler assignment
11RELION3.1classification
12RELION3.13D reconstruction
13Servalcat0.4.88model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1495868
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 30549 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingDetails: SID-1 protein in our accompanying PDB entry "SID-1 in complex with dsRNA"
Source name: Other / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumberWeight
ELECTRON MICROSCOPYs_bond_nonh_d0.013098052952880.011853177
ELECTRON MICROSCOPYs_angle_nonh_d1.7652197171641.64363345

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