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- PDB-7px3: Structure of U5 snRNP assembly and recycling factor TSSC4 in comp... -

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Basic information

Entry
Database: PDB / ID: 7px3
TitleStructure of U5 snRNP assembly and recycling factor TSSC4 in complex with BRR2 and Jab1 domain of PRPF8
Components
  • Pre-mRNA-processing-splicing factor 8
  • Protein TSSC4
  • U5 small nuclear ribonucleoprotein 200 kDa helicase
KeywordsSPLICING / Spliceosomal biogenesis
Function / homology
Function and homology information


cis assembly of pre-catalytic spliceosome / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / RNA splicing, via transesterification reactions / U2-type catalytic step 1 spliceosome / U2-type precatalytic spliceosome / U2-type catalytic step 2 spliceosome / K63-linked polyubiquitin modification-dependent protein binding / mRNA Splicing - Minor Pathway / spliceosomal tri-snRNP complex assembly / molecular sequestering activity ...cis assembly of pre-catalytic spliceosome / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / RNA splicing, via transesterification reactions / U2-type catalytic step 1 spliceosome / U2-type precatalytic spliceosome / U2-type catalytic step 2 spliceosome / K63-linked polyubiquitin modification-dependent protein binding / mRNA Splicing - Minor Pathway / spliceosomal tri-snRNP complex assembly / molecular sequestering activity / U5 snRNA binding / U5 snRNP / U2 snRNA binding / U6 snRNA binding / pre-mRNA intronic binding / spliceosomal snRNP assembly / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / mRNA Splicing - Major Pathway / RNA splicing / spliceosomal complex / helicase activity / mRNA splicing, via spliceosome / mRNA processing / osteoblast differentiation / cellular response to tumor necrosis factor / cellular response to lipopolysaccharide / RNA helicase activity / nuclear speck / cilium / RNA helicase / protein-containing complex binding / ATP hydrolysis activity / RNA binding / nucleoplasm / ATP binding / identical protein binding / nucleus / membrane / plasma membrane / cytoplasm
Similarity search - Function
Tumour suppressing sub-chromosomal transferable candidate 4 / Tumour suppressing sub-chromosomal transferable candidate 4 / Brr2, N-terminal helicase PWI domain / : / N-terminal helicase PWI domain / Pre-mRNA-splicing helicase BRR2 plug domain / Winged Helix-turn-helix domain / Sec63 Brl domain / : / Sec63 domain ...Tumour suppressing sub-chromosomal transferable candidate 4 / Tumour suppressing sub-chromosomal transferable candidate 4 / Brr2, N-terminal helicase PWI domain / : / N-terminal helicase PWI domain / Pre-mRNA-splicing helicase BRR2 plug domain / Winged Helix-turn-helix domain / Sec63 Brl domain / : / Sec63 domain / Sec63 Brl domain / JAB1/Mov34/MPN/PAD-1 ubiquitin protease / PROCT domain / Prp8 RNase domain IV, fingers region / PROCT (NUC072) domain / PRO8NT domain / PROCN domain / Pre-mRNA-processing-splicing factor 8, U6-snRNA-binding / Pre-mRNA-processing-splicing factor 8, U5-snRNA-binding / RNA recognition motif, spliceosomal PrP8 / PRP8 domain IV core / Pre-mRNA-processing-splicing factor 8, U5-snRNA-binding domain superfamily / Prp8 RNase domain IV, palm region / PRO8NT (NUC069), PrP8 N-terminal domain / PROCN (NUC071) domain / U6-snRNA interacting domain of PrP8 / U5-snRNA binding site 2 of PrP8 / RNA recognition motif of the spliceosomal PrP8 / PRP8 domain IV core / Pre-mRNA-processing-splicing factor 8 / JAB/MPN domain / JAB1/MPN/MOV34 metalloenzyme domain / MPN domain / MPN domain profile. / C2 domain superfamily / DEAD/DEAH box helicase domain / DEAD/DEAH box helicase / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Immunoglobulin E-set / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Ribonuclease H-like superfamily / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
U5 small nuclear ribonucleoprotein 200 kDa helicase / Pre-mRNA-processing-splicing factor 8 / U5 small nuclear ribonucleoprotein TSSC4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.05 Å
AuthorsBergfort, A. / Kuropka, B. / Ilik, I.A. / Freund, C. / Aktas, T. / Hilal, T. / Weber, G. / Wahl, M.C.
Funding support Germany, 1items
OrganizationGrant numberCountry
German Research Foundation (DFG)TRR186/2 Germany
CitationJournal: Nucleic Acids Res / Year: 2022
Title: The intrinsically disordered TSSC4 protein acts as a helicase inhibitor, placeholder and multi-interaction coordinator during snRNP assembly and recycling.
Authors: Alexandra Bergfort / Tarek Hilal / Benno Kuropka / İbrahim Avşar Ilik / Gert Weber / Tuğçe Aktaş / Christian Freund / Markus C Wahl /
Abstract: Biogenesis of spliceosomal small nuclear ribonucleoproteins (snRNPs) and their recycling after splicing require numerous assembly/recycling factors whose modes of action are often poorly understood. ...Biogenesis of spliceosomal small nuclear ribonucleoproteins (snRNPs) and their recycling after splicing require numerous assembly/recycling factors whose modes of action are often poorly understood. The intrinsically disordered TSSC4 protein has been identified as a nuclear-localized U5 snRNP and U4/U6-U5 tri-snRNP assembly/recycling factor, but how TSSC4's intrinsic disorder supports TSSC4 functions remains unknown. Using diverse interaction assays and cryogenic electron microscopy-based structural analysis, we show that TSSC4 employs four conserved, non-contiguous regions to bind the PRPF8 Jab1/MPN domain and the SNRNP200 helicase at functionally important sites. It thereby inhibits SNRNP200 helicase activity, spatially aligns the proteins, coordinates formation of a U5 sub-module and transiently blocks premature interaction of SNRNP200 with at least three other spliceosomal factors. Guided by the structure, we designed a TSSC4 variant that lacks stable binding to the PRPF8 Jab1/MPN domain or SNRNP200 in vitro. Comparative immunoprecipitation/mass spectrometry from HEK293 nuclear extract revealed distinct interaction profiles of wild type TSSC4 and the variant deficient in PRPF8/SNRNP200 binding with snRNP proteins, other spliceosomal proteins as well as snRNP assembly/recycling factors and chaperones. Our findings elucidate molecular strategies employed by an intrinsically disordered protein to promote snRNP assembly, and suggest multiple TSSC4-dependent stages during snRNP assembly/recycling.
History
DepositionOct 7, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jan 26, 2022Provider: repository / Type: Initial release
Revision 1.1Aug 10, 2022Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Jul 17, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond / em_admin / Item: _em_admin.last_update

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Structure visualization

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Assembly

Deposited unit
B: U5 small nuclear ribonucleoprotein 200 kDa helicase
J: Pre-mRNA-processing-splicing factor 8
T: Protein TSSC4


Theoretical massNumber of molelcules
Total (without water)264,1663
Polymers264,1663
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein U5 small nuclear ribonucleoprotein 200 kDa helicase / Activating signal cointegrator 1 complex subunit 3-like 1 / BRR2 homolog / U5 snRNP-specific 200 ...Activating signal cointegrator 1 complex subunit 3-like 1 / BRR2 homolog / U5 snRNP-specific 200 kDa protein / U5-200KD


Mass: 199666.656 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SNRNP200, ASCC3L1, HELIC2, KIAA0788 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: O75643, RNA helicase
#2: Protein Pre-mRNA-processing-splicing factor 8 / 220 kDa U5 snRNP-specific protein / PRP8 homolog / Splicing factor Prp8 / p220


Mass: 30133.229 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PRPF8, PRPC8 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q6P2Q9
#3: Protein Protein TSSC4 / Tumor-suppressing STF cDNA 4 protein / Tumor-suppressing subchromosomal transferable fragment ...Tumor-suppressing STF cDNA 4 protein / Tumor-suppressing subchromosomal transferable fragment candidate gene 4 protein


Mass: 34366.465 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TSSC4 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9Y5U2

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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

Component
IDNameTypeEntity IDParent-IDSource
1SNRNP200-TSSC4-PRP8F complexCOMPLEXall0MULTIPLE SOURCES
2SNRNP200COMPLEX#11RECOMBINANT
3PRPF8-Jab1/MPNCOMPLEX#21RECOMBINANT
4TSSC4COMPLEX#31RECOMBINANT
Molecular weight
IDEntity assembly-IDUnitsExperimental value
11KILODALTONS/NANOMETERNO
21NO
31NO
41NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
32Homo sapiens (human)9606
43Homo sapiens (human)9606
54Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Trichoplusia ni (cabbage looper)7111
33Trichoplusia ni (cabbage looper)7111
44Escherichia coli BL21(DE3) (bacteria)469008
Buffer solutionpH: 7.6
SpecimenConc.: 5 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: 308 K

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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 FIELD / Nominal magnification: 120000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 30.59 sec. / Electron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3349

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.19.2_4158refinement
PHENIX1.19.2_4158refinement
EM software
IDNameVersionCategory
2EPU2.9image acquisition
4cryoSPARC2.9CTF correction
10cryoSPARC2.9initial Euler assignment
11cryoSPARC2.9final Euler assignment
13cryoSPARC33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1025529
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.05 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 387973 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 115.8 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002516803
ELECTRON MICROSCOPYf_angle_d0.451622774
ELECTRON MICROSCOPYf_chiral_restr0.04022551
ELECTRON MICROSCOPYf_plane_restr0.00372919
ELECTRON MICROSCOPYf_dihedral_angle_d11.54576321

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