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- PDB-8s86: human PLD3 homodimer structure -

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Basic information

Entry
Database: PDB / ID: 8s86
Titlehuman PLD3 homodimer structure
Components5'-3' exonuclease PLD3
KeywordsIMMUNE SYSTEM / Exonuclease
Function / homology
Function and homology information


spleen exonuclease / Synthesis of PG / single-stranded DNA 5'-3' DNA exonuclease activity / myotube differentiation / phospholipase D activity / immune system process / regulation of cytokine production involved in inflammatory response / Role of phospholipids in phagocytosis / lysosomal lumen / late endosome membrane ...spleen exonuclease / Synthesis of PG / single-stranded DNA 5'-3' DNA exonuclease activity / myotube differentiation / phospholipase D activity / immune system process / regulation of cytokine production involved in inflammatory response / Role of phospholipids in phagocytosis / lysosomal lumen / late endosome membrane / early endosome membrane / inflammatory response / lysosomal membrane / Golgi membrane / endoplasmic reticulum membrane / extracellular exosome
Similarity search - Function
PLD-like domain / PLD-like domain / Phospholipase D. Active site motifs. / Phospholipase D/Transphosphatidylase / Phospholipase D phosphodiesterase active site profile.
Similarity search - Domain/homology
5'-3' exonuclease PLD3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsLammens, K.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Immunity / Year: 2024
Title: Lysosomal endonuclease RNase T2 and PLD exonucleases cooperatively generate RNA ligands for TLR7 activation.
Authors: Marleen Bérouti / Katja Lammens / Matthias Heiss / Larissa Hansbauer / Stefan Bauernfried / Jan Stöckl / Francesca Pinci / Ignazio Piseddu / Wilhelm Greulich / Meiyue Wang / Christophe ...Authors: Marleen Bérouti / Katja Lammens / Matthias Heiss / Larissa Hansbauer / Stefan Bauernfried / Jan Stöckl / Francesca Pinci / Ignazio Piseddu / Wilhelm Greulich / Meiyue Wang / Christophe Jung / Thomas Fröhlich / Thomas Carell / Karl-Peter Hopfner / Veit Hornung /
Abstract: Toll-like receptor 7 (TLR7) is essential for recognition of RNA viruses and initiation of antiviral immunity. TLR7 contains two ligand-binding pockets that recognize different RNA degradation ...Toll-like receptor 7 (TLR7) is essential for recognition of RNA viruses and initiation of antiviral immunity. TLR7 contains two ligand-binding pockets that recognize different RNA degradation products: pocket 1 recognizes guanosine, while pocket 2 coordinates pyrimidine-rich RNA fragments. We found that the endonuclease RNase T2, along with 5' exonucleases PLD3 and PLD4, collaboratively generate the ligands for TLR7. Specifically, RNase T2 generated guanosine 2',3'-cyclic monophosphate-terminated RNA fragments. PLD exonuclease activity further released the terminal 2',3'-cyclic guanosine monophosphate (2',3'-cGMP) to engage pocket 1 and was also needed to generate RNA fragments for pocket 2. Loss-of-function studies in cell lines and primary cells confirmed the critical requirement for PLD activity. Biochemical and structural studies showed that PLD enzymes form homodimers with two ligand-binding sites important for activity. Previously identified disease-associated PLD mutants failed to form stable dimers. Together, our data provide a mechanistic basis for the detection of RNA fragments by TLR7.
History
DepositionMar 5, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 15, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: 5'-3' exonuclease PLD3
B: 5'-3' exonuclease PLD3


Theoretical massNumber of molelcules
Total (without water)96,1162
Polymers96,1162
Non-polymers00
Water0
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 5'-3' exonuclease PLD3 / Choline phosphatase 3 / HindIII K4L homolog / Hu-K4 / Phosphatidylcholine-hydrolyzing phospholipase ...Choline phosphatase 3 / HindIII K4L homolog / Hu-K4 / Phosphatidylcholine-hydrolyzing phospholipase D3 / Phospholipase D3 / PLD 3


Mass: 48058.016 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PLD3 / Production host: Homo sapiens (human) / References: UniProt: Q8IV08, spleen exonuclease

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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: PLD3 dimer / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 5.5
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2900 nm / Nominal defocus min: 1000 nm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 45 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM softwareName: EPU / Category: image acquisition
CTF correctionType: NONE
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 2823826 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0056376
ELECTRON MICROSCOPYf_angle_d0.8598688
ELECTRON MICROSCOPYf_dihedral_angle_d13.5432282
ELECTRON MICROSCOPYf_chiral_restr0.052969
ELECTRON MICROSCOPYf_plane_restr0.0111118

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