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- PDB-6y53: human 17S U2 snRNP low resolution part -

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Basic information

Entry
Database: PDB / ID: 6y53
Titlehuman 17S U2 snRNP low resolution part
Components
  • (Small nuclear ribonucleoprotein ...) x 6
  • (Splicing factor 3A subunit ...) x 3
  • (Splicing factor 3B subunit ...) x 4
  • (U2 small nuclear ribonucleoprotein ...) x 2
  • HIV Tat-specific factor 1
  • Probable ATP-dependent RNA helicase DDX46
  • Small nuclear ribonucleoprotein-associated proteins B and B'
  • U2 snRNA
KeywordsSPLICING / 17S U2 snRNP
Function / homology
Function and homology information


U11/U12 snRNP / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / histone pre-mRNA 3'end processing complex / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / B-WICH complex / protein methylation ...U11/U12 snRNP / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / histone pre-mRNA 3'end processing complex / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / B-WICH complex / protein methylation / U12-type spliceosomal complex / poly-ADP-D-ribose modification-dependent protein binding / 7-methylguanosine cap hypermethylation / U1 snRNP binding / methylosome / RNA splicing, via transesterification reactions / pICln-Sm protein complex / chromatin-protein adaptor activity / snRNP binding / blastocyst formation / protein localization to site of double-strand break / small nuclear ribonucleoprotein complex / splicing factor binding / SMN-Sm protein complex / spliceosomal tri-snRNP complex / P granule / telomerase holoenzyme complex / U2-type precatalytic spliceosome / commitment complex / mRNA cis splicing, via spliceosome / telomerase RNA binding / U2-type spliceosomal complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / U4 snRNP / RNA Polymerase II Transcription Termination / U2 snRNP / U1 snRNP / U2-type prespliceosome / positive regulation of transcription by RNA polymerase III / precatalytic spliceosome / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / mRNA Splicing - Minor Pathway / mRNA 3'-splice site recognition / U5 snRNP / U2 snRNA binding / spliceosomal snRNP assembly / U1 snRNA binding / Cajal body / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / mRNA Splicing - Major Pathway / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / RNA splicing / spliceosomal complex / double-strand break repair via homologous recombination / positive regulation of neuron projection development / mRNA splicing, via spliceosome / B-WICH complex positively regulates rRNA expression / fibrillar center / cytoplasmic ribonucleoprotein granule / mRNA processing / site of double-strand break / snRNP Assembly / spermatogenesis / SARS-CoV-2 modulates host translation machinery / RNA helicase activity / nuclear speck / nuclear body / RNA helicase / chromatin remodeling / mRNA binding / nucleolus / enzyme binding / positive regulation of transcription by RNA polymerase II / ATP hydrolysis activity / RNA binding / extracellular exosome / zinc ion binding / nucleoplasm / ATP binding / nucleus / cytoplasm / cytosol
Similarity search - Function
TatSF1-like, RNA recognition motif 1 / TatSF1-like / : / KH-domain / SF3B6, RNA recognition motif / SF3B4, RNA recognition motif 2 / Splicing factor SF3a60 binding domain / Splicing factor SF3a60 binding domain / Cactus-binding C-terminus of cactin protein / Splicing factor 3A subunit 1, ubiquitin domain ...TatSF1-like, RNA recognition motif 1 / TatSF1-like / : / KH-domain / SF3B6, RNA recognition motif / SF3B4, RNA recognition motif 2 / Splicing factor SF3a60 binding domain / Splicing factor SF3a60 binding domain / Cactus-binding C-terminus of cactin protein / Splicing factor 3A subunit 1, ubiquitin domain / : / Replication stress response SDE2 C-terminal / SF3A2 domain / : / Pre-mRNA-splicing factor SF3a complex subunit 2 (Prp11) / U2 small nuclear ribonucleoprotein B'', RNA recognition motif 2 / U2 small nuclear ribonucleoprotein B'', RNA recognition motif 1 / Splicing factor SF3a60 /Prp9 subunit, C-terminal / SF3A3 domain / SF3a60/Prp9 C-terminal / Pre-mRNA-splicing factor SF3A3, of SF3a complex, Prp9 / SF3B4, RNA recognition motif 1 / : / Splicing factor 3A subunit 1, conserved domain / Splicing factor 3A subunit 1 / Pre-mRNA splicing factor PRP21 like protein / : / : / Domain of unknown function DUF382 / Domain of unknown function (DUF382) / SWAP/Surp / SWAP/Surp superfamily / Surp module / SURP motif repeat profile. / Suppressor-of-White-APricot splicing regulator / Splicing factor 3B subunit 1 / Splicing factor 3B subunit 1 / Zinc-finger of C2H2 type / PSP, proline-rich / PSP / proline-rich domain in spliceosome associated proteins / Matrin/U1-C, C2H2-type zinc finger / : / Zinc finger matrin-type profile. / Splicing factor 3B subunit 1-like / Small ribonucleoprotein associated, SmB/SmN / U2 small nuclear ribonucleoprotein A' / Small nuclear ribonucleoprotein D1 / U2A'/phosphoprotein 32 family A, C-terminal / occurring C-terminal to leucine-rich repeats / : / PPP2R1A-like HEAT repeat / SAP motif profile. / Leucine-rich repeat / SAP domain / Putative DNA-binding (bihelical) motif predicted to be involved in chromosomal organisation / SAP domain / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein F / Matrin/U1-C-like, C2H2-type zinc finger / U1-like zinc finger / Sm-like protein Lsm7/SmG / Like-Sm (LSM) domain containing protein, LSm4/SmD1/SmD3 / Sm-like protein Lsm6/SmF / LSM domain / LSM domain, eukaryotic/archaea-type / snRNP Sm proteins / DEAD-box subfamily ATP-dependent helicases signature. / ATP-dependent RNA helicase DEAD-box, conserved site / RNA helicase, DEAD-box type, Q motif / : / Sm domain profile. / DEAD-box RNA helicase Q motif profile. / LSM domain superfamily / Leucine-rich repeat profile. / Zinc finger C2H2 superfamily / DEAD/DEAH box helicase domain / DEAD/DEAH box helicase / Zinc finger C2H2-type / Leucine-rich repeat / RNA recognition motif / RNA recognition motif / Eukaryotic RNA Recognition Motif (RRM) profile. / RNA recognition motif domain / RNA-binding domain superfamily / Leucine-rich repeat domain superfamily / Helicase conserved C-terminal domain / Armadillo-like helical / Ubiquitin family / Ubiquitin homologues / Ubiquitin domain profile. / Ubiquitin-like domain / helicase superfamily c-terminal domain / 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
Similarity search - Domain/homology
: / RNA / RNA (> 10) / RNA (> 100) / 17S U2 SnRNP complex component HTATSF1 / Splicing factor 3B subunit 1 / U2 small nuclear ribonucleoprotein B'' / U2 small nuclear ribonucleoprotein A' / Small nuclear ribonucleoprotein-associated proteins B and B' / Small nuclear ribonucleoprotein E ...: / RNA / RNA (> 10) / RNA (> 100) / 17S U2 SnRNP complex component HTATSF1 / Splicing factor 3B subunit 1 / U2 small nuclear ribonucleoprotein B'' / U2 small nuclear ribonucleoprotein A' / Small nuclear ribonucleoprotein-associated proteins B and B' / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein F / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein Sm D1 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein Sm D3 / Splicing factor 3A subunit 3 / Splicing factor 3B subunit 2 / Splicing factor 3B subunit 4 / Splicing factor 3A subunit 2 / Splicing factor 3A subunit 1 / Probable ATP-dependent RNA helicase DDX46 / Splicing factor 3B subunit 6
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 7.1 Å
AuthorsZhang, Z. / Will, C.L. / Bertram, K. / Luehrmann, R. / Stark, H.
Funding support Germany, 1items
OrganizationGrant numberCountry
German Research Foundation (DFG) Germany
CitationJournal: Nature / Year: 2020
Title: Molecular architecture of the human 17S U2 snRNP.
Authors: Zhenwei Zhang / Cindy L Will / Karl Bertram / Olexandr Dybkov / Klaus Hartmuth / Dmitry E Agafonov / Romina Hofele / Henning Urlaub / Berthold Kastner / Reinhard Lührmann / Holger Stark /
Abstract: The U2 small nuclear ribonucleoprotein (snRNP) has an essential role in the selection of the precursor mRNA branch-site adenosine, the nucleophile for the first step of splicing. Stable addition of ...The U2 small nuclear ribonucleoprotein (snRNP) has an essential role in the selection of the precursor mRNA branch-site adenosine, the nucleophile for the first step of splicing. Stable addition of U2 during early spliceosome formation requires the DEAD-box ATPase PRP5. Yeast U2 small nuclear RNA (snRNA) nucleotides that form base pairs with the branch site are initially sequestered in a branchpoint-interacting stem-loop (BSL), but whether the human U2 snRNA folds in a similar manner is unknown. The U2 SF3B1 protein, a common mutational target in haematopoietic cancers, contains a HEAT domain (SF3B1) with an open conformation in isolated SF3b, but a closed conformation in spliceosomes, which is required for stable interaction between U2 and the branch site. Here we report a 3D cryo-electron microscopy structure of the human 17S U2 snRNP at a core resolution of 4.1 Å and combine it with protein crosslinking data to determine the molecular architecture of this snRNP. Our structure reveals that SF3B1 interacts with PRP5 and TAT-SF1, and maintains its open conformation in U2 snRNP, and that U2 snRNA forms a BSL that is sandwiched between PRP5, TAT-SF1 and SF3B1. Thus, substantial remodelling of the BSL and displacement of BSL-interacting proteins must occur to allow formation of the U2-branch-site helix. Our studies provide a structural explanation of why TAT-SF1 must be displaced before the stable addition of U2 to the spliceosome, and identify RNP rearrangements facilitated by PRP5 that are required for stable interaction between U2 and the branch site.
History
DepositionFeb 24, 2020Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 17, 2020Provider: repository / Type: Initial release
Revision 1.1Jul 22, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.2May 22, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Assembly

Deposited unit
a: U2 small nuclear ribonucleoprotein A'
b: U2 small nuclear ribonucleoprotein B''
z: Splicing factor 3B subunit 6
p: Probable ATP-dependent RNA helicase DDX46
6: Splicing factor 3A subunit 1
7: Splicing factor 3A subunit 2
9: Splicing factor 3A subunit 3
o: Splicing factor 3B subunit 4
m: Small nuclear ribonucleoprotein-associated proteins B and B'
k: Small nuclear ribonucleoprotein G
n: Small nuclear ribonucleoprotein Sm D1
h: Small nuclear ribonucleoprotein Sm D2
l: Small nuclear ribonucleoprotein Sm D3
j: Small nuclear ribonucleoprotein E
i: Small nuclear ribonucleoprotein F
q: HIV Tat-specific factor 1
8: Splicing factor 3B subunit 2
u: Splicing factor 3B subunit 1
2: U2 snRNA


Theoretical massNumber of molelcules
Total (without water)914,91419
Polymers914,91419
Non-polymers00
Water00
1


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

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Components

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U2 small nuclear ribonucleoprotein ... , 2 types, 2 molecules ab

#1: Protein U2 small nuclear ribonucleoprotein A' / U2 snRNP A'


Mass: 28456.584 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P09661
#2: Protein U2 small nuclear ribonucleoprotein B'' / U2 snRNP B''


Mass: 25524.367 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P08579

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Splicing factor 3B subunit ... , 4 types, 4 molecules zo8u

#3: Protein Splicing factor 3B subunit 6 / Pre-mRNA branch site protein p14 / SF3b 14 kDa subunit / SF3B14a / Spliceosome-associated protein / ...Pre-mRNA branch site protein p14 / SF3b 14 kDa subunit / SF3B14a / Spliceosome-associated protein / 14-kDa / Splicing factor 3b / subunit 6 / 14kDa


Mass: 14606.900 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9Y3B4
#8: Protein Splicing factor 3B subunit 4 / Pre-mRNA-splicing factor SF3b 49 kDa subunit / Spliceosome-associated protein 49 / SAP 49


Mass: 44436.570 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15427
#17: Protein Splicing factor 3B subunit 2 / Pre-mRNA-splicing factor SF3b 145 kDa subunit / SF3b145 / Spliceosome-associated protein 145 / SAP 145


Mass: 100377.812 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q13435
#18: Protein Splicing factor 3B subunit 1 / Pre-mRNA-splicing factor SF3b 155 kDa subunit / SF3b155 / Spliceosome-associated protein 155 / SAP 155


Mass: 146024.938 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O75533

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Protein , 3 types, 3 molecules pmq

#4: Protein Probable ATP-dependent RNA helicase DDX46 / DEAD box protein 46 / PRP5 homolog


Mass: 117576.484 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q7L014, RNA helicase
#9: Protein Small nuclear ribonucleoprotein-associated proteins B and B' / snRNP-B / Sm protein B/B' / SmB/B'


Mass: 24642.131 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P14678
#16: Protein HIV Tat-specific factor 1 / Tat-SF1


Mass: 85965.961 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O43719

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Splicing factor 3A subunit ... , 3 types, 3 molecules 679

#5: Protein Splicing factor 3A subunit 1 / SF3a120 / Spliceosome-associated protein 114 / SAP 114


Mass: 88991.094 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15459
#6: Protein Splicing factor 3A subunit 2 / SF3a66 / Spliceosome-associated protein 62 / SAP 62


Mass: 49327.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15428
#7: Protein Splicing factor 3A subunit 3 / SF3a60 / Spliceosome-associated protein 61 / SAP 61


Mass: 58934.844 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q12874

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Small nuclear ribonucleoprotein ... , 6 types, 6 molecules knhlji

#10: Protein Small nuclear ribonucleoprotein G / snRNP-G / Sm protein G / SmG


Mass: 8508.084 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62308
#11: Protein Small nuclear ribonucleoprotein Sm D1 / Sm-D1 / Sm-D autoantigen / snRNP core protein D1


Mass: 13310.653 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62314
#12: Protein Small nuclear ribonucleoprotein Sm D2 / Sm-D2 / snRNP core protein D2


Mass: 13551.928 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62316
#13: Protein Small nuclear ribonucleoprotein Sm D3 / Sm-D3 / snRNP core protein D3


Mass: 13940.308 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62318
#14: Protein Small nuclear ribonucleoprotein E / snRNP-E / Sm protein E / SmE


Mass: 10817.601 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62304
#15: Protein Small nuclear ribonucleoprotein F / snRNP-F / Sm protein F / SmF


Mass: 9734.171 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62306

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RNA chain , 1 types, 1 molecules 2

#19: RNA chain U2 snRNA


Mass: 60186.445 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: GenBank: 36516

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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 17S U2 snRNP / Type: COMPLEX / Entity ID: all / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.9
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid type: Quantifoil R3.5/1
VitrificationInstrument: FEI VITROBOT MARK I / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Cs: 0.01 mm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 1 sec. / Electron dose: 72 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM software
IDNameVersionCategory
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 7.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 120070 / Symmetry type: POINT
Atomic model buildingSpace: REAL

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