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- PDB-9ngo: CRYO-EM STRUCTURE OF HUMAN U7 SNRNP WITH METHYLATED noncleavable ... -

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Basic information

Entry
Database: PDB / ID: 9ngo
TitleCRYO-EM STRUCTURE OF HUMAN U7 SNRNP WITH METHYLATED noncleavable H2A* SUBSTRATE PRE-MRNA (FOCUS MAP)
Components
  • Cleavage and polyadenylation specificity factor subunit 2
  • Cleavage and polyadenylation specificity factor subunit 3
  • Symplekin
KeywordsRNA BINDING PROTEIN / Methylated RNA / 3' end processing / U7 snRNP / Histone pre-mRNA
Function / homology
Function and homology information


mRNA 3'-end processing by stem-loop binding and cleavage / co-transcriptional mRNA 3'-end processing, cleavage and polyadenylation pathway / 5'-3' RNA exonuclease activity / Processing of Intronless Pre-mRNAs / mRNA cleavage and polyadenylation specificity factor complex / nuclear stress granule / Hydrolases; Acting on ester bonds; Endoribonucleases producing 3'-phosphomonoesters / mRNA 3'-end processing / Transport of Mature mRNA Derived from an Intronless Transcript / mRNA 3'-end processing ...mRNA 3'-end processing by stem-loop binding and cleavage / co-transcriptional mRNA 3'-end processing, cleavage and polyadenylation pathway / 5'-3' RNA exonuclease activity / Processing of Intronless Pre-mRNAs / mRNA cleavage and polyadenylation specificity factor complex / nuclear stress granule / Hydrolases; Acting on ester bonds; Endoribonucleases producing 3'-phosphomonoesters / mRNA 3'-end processing / Transport of Mature mRNA Derived from an Intronless Transcript / mRNA 3'-end processing / RNA Polymerase II Transcription Termination / Processing of Capped Intron-Containing Pre-mRNA / positive regulation of G1/S transition of mitotic cell cycle / bicellular tight junction / negative regulation of protein binding / RNA endonuclease activity / mRNA processing / cytoskeleton / cell adhesion / postsynapse / nuclear body / ribonucleoprotein complex / glutamatergic synapse / RNA binding / nucleoplasm / metal ion binding / membrane / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Cleavage and polyadenylation specificity factor 2, C-terminal / CPSF2, metallo-hydrolase domain / Cleavage and polyadenylation factor 2 C-terminal / Cleavage and polyadenylation specificity factor subunit 2 / Pre-mRNA 3'-end-processing endonuclease polyadenylation factor C-term / Pre-mRNA 3'-end-processing endonuclease polyadenylation factor C-term / CPSF73-100_C / Symplekin/Pta1 / Symplekin C-terminal / Symplekin/Pta1, N-terminal ...Cleavage and polyadenylation specificity factor 2, C-terminal / CPSF2, metallo-hydrolase domain / Cleavage and polyadenylation factor 2 C-terminal / Cleavage and polyadenylation specificity factor subunit 2 / Pre-mRNA 3'-end-processing endonuclease polyadenylation factor C-term / Pre-mRNA 3'-end-processing endonuclease polyadenylation factor C-term / CPSF73-100_C / Symplekin/Pta1 / Symplekin C-terminal / Symplekin/Pta1, N-terminal / Symplekin/PTA1 N-terminal / Symplekin tight junction protein C terminal / Metallo-beta-lactamase superfamily domain / : / Beta-Casp domain / Beta-Casp domain / Beta-Casp domain / Zn-dependent metallo-hydrolase, RNA specificity domain / Zn-dependent metallo-hydrolase RNA specificity domain / Metallo-beta-lactamase superfamily / Metallo-beta-lactamase superfamily / Metallo-beta-lactamase / Ribonuclease Z/Hydroxyacylglutathione hydrolase-like / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
Symplekin / Cleavage and polyadenylation specificity factor subunit 2 / Cleavage and polyadenylation specificity factor subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.01 Å
AuthorsDesotell, A. / Tong, L.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM118093 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM029832 United States
CitationJournal: Nucleic Acids Res / Year: 2026
Title: An N-terminal helix of Lsm11 stabilizes CPSF73 in U7 snRNP for histone pre-mRNA 3'-end processing.
Authors: Anthony Desotell / William F Marzluff / Zbigniew Dominski / Liang Tong /
Abstract: The U7 snRNP (small nuclear ribonucleoprotein) is responsible for the 3'-end processing of replication-dependent histone messenger RNA precursors (pre-mRNAs). A helix in the Lsm11 N-terminal ...The U7 snRNP (small nuclear ribonucleoprotein) is responsible for the 3'-end processing of replication-dependent histone messenger RNA precursors (pre-mRNAs). A helix in the Lsm11 N-terminal extension contacts the metallo-β-lactamase domain of the U7 snRNP endonuclease CPSF73. We mutated or deleted this helix and found that the mutant machineries had substantially reduced cleavage activity toward the pre-mRNA. Our cryo-electron microscopy (cryo-EM) studies indicated that the helix was important for helping to hold CPSF73 in its correct position for the cleavage reaction. We also reconstituted a wild-type U7 snRNP in complex with a methylated, noncleavable pre-mRNA. We observed that CPSF73 could achieve an open conformation independent of RNA binding to its active site. Finally, we found that a previously uninterpreted EM density for a small helix at the CPSF73-CPSF100 interface belonged to the C-terminal end of CstF77, copurified from insect cells and highly conserved among CstF77 homologs. This CstF77 binding site had a small effect on the cleavage activity of U7 snRNP. Overall, our studies have revealed the importance of the conserved helix in the Lsm11 N-terminal extension for U7 snRNP, provided structural evidence that CPSF73 can achieve an open, active conformation without RNA binding in its active site, and identified a previously unknown binding site for CstF77 in CPSF100.
History
DepositionFeb 22, 2025Deposition site: RCSB / Processing site: RCSB
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: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
H: Cleavage and polyadenylation specificity factor subunit 3
I: Cleavage and polyadenylation specificity factor subunit 2
J: Symplekin


Theoretical massNumber of molelcules
Total (without water)286,5343
Polymers286,5343
Non-polymers00
Water00
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 Cleavage and polyadenylation specificity factor subunit 3 / Cleavage and polyadenylation specificity factor 73 kDa subunit / CPSF 73 kDa subunit / mRNA 3'-end- ...Cleavage and polyadenylation specificity factor 73 kDa subunit / CPSF 73 kDa subunit / mRNA 3'-end-processing endonuclease CPSF-73


Mass: 77580.883 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CPSF3, CPSF73 / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: Q9UKF6, Hydrolases; Acting on ester bonds; Endoribonucleases producing 3'-phosphomonoesters
#2: Protein Cleavage and polyadenylation specificity factor subunit 2 / Cleavage and polyadenylation specificity factor 100 kDa subunit / CPSF 100 kDa subunit


Mass: 88597.734 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CPSF2, CPSF100, KIAA1367 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q9P2I0
#3: Protein Symplekin


Mass: 120355.125 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SYMPK, SPK / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q92797
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 U7 SNRNP WITH METHYLATED H2A* SUBSTRATE PRE-MRNA
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.485 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
120 mM4-(2-hydroxyethyl)-1-piperazineethanesulfonic acidHEPES1
2100 mMsodium chlorideNaCl1
310 mMEthylenediaminetetraacetic AcidEDTA1
45 mMDithiothreitolDTT1
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 1000 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 58.1 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCv.4.4.1+240110particle selection
7UCSF ChimeraXmodel fitting
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 8741039
3D reconstructionResolution: 3.01 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 168875 / Symmetry type: POINT
Atomic model buildingSource name: AlphaFold / Type: in silico model

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