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- PDB-7vpx: The cryo-EM structure of the human pre-A complex -

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Basic information

Entry
Database: PDB / ID: 7vpx
TitleThe cryo-EM structure of the human pre-A complex
Components
  • (Small nuclear ribonucleoprotein ...SnRNP) x 6
  • (Splicing factor 3A subunit ...) x 3
  • (Splicing factor 3B subunit ...) x 5
  • (U1 small nuclear ribonucleoprotein ...) x 3
  • (U2 small nuclear ribonucleoprotein ...) x 2
  • 5SS
  • DnaJ homolog subfamily C member 8
  • PHD finger-like domain-containing protein 5A
  • Probable ATP-dependent RNA helicase DDX46
  • Small nuclear ribonucleoprotein-associated proteins B and B'
  • Splicing factor 1
  • U1 snRNAU1 spliceosomal RNA
  • U2 snRNAU2 spliceosomal RNA
  • pre-mRNAPrimary transcript
KeywordsSPLICING / human spliceosome / pre-A complex / PRP5 / A complex / U1 snRNP / U2 snRNP
Function / homology
Function and homology information


nuclear body organization / negative regulation of protein refolding / U2AF complex / regulation of steroid biosynthetic process / regulation of ATP-dependent activity / U11/U12 snRNP / snRNP binding / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding ...nuclear body organization / negative regulation of protein refolding / U2AF complex / regulation of steroid biosynthetic process / regulation of ATP-dependent activity / U11/U12 snRNP / snRNP binding / U2 snRNP binding / U7 snRNA binding / histone pre-mRNA DCP binding / U7 snRNP / B-WICH complex / histone pre-mRNA 3'end processing complex / Leydig cell differentiation / SLBP independent Processing of Histone Pre-mRNAs / SLBP Dependent Processing of Replication-Dependent Histone Pre-mRNAs / male sex determination / splicing factor binding / protein methylation / U12-type spliceosomal complex / methylosome / 7-methylguanosine cap hypermethylation / U1 snRNP binding / pICln-Sm protein complex / RNA splicing, via transesterification reactions / small nuclear ribonucleoprotein complex / P granule / SMN-Sm protein complex / regulation of mRNA splicing, via spliceosome / spliceosomal tri-snRNP complex / negative regulation of chaperone-mediated autophagy / telomerase RNA binding / positive regulation of mRNA splicing, via spliceosome / : / telomerase holoenzyme complex / mRNA cis splicing, via spliceosome / U2-type spliceosomal complex / U2-type precatalytic spliceosome / commitment complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / U4 snRNP / SAGA complex / U2 snRNP / RNA Polymerase II Transcription Termination / positive regulation of transcription by RNA polymerase III / U1 snRNP / pre-mRNA 5'-splice site binding / U2-type prespliceosome / precatalytic spliceosome / intercellular bridge / spliceosomal complex assembly / positive regulation of transcription by RNA polymerase I / mRNA Splicing - Minor Pathway / regulation of RNA splicing / mRNA 5'-splice site recognition / mRNA 3'-splice site recognition / U5 snRNP / U2 snRNA binding / Cajal body / spliceosomal snRNP assembly / regulation of DNA repair / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / Hsp70 protein binding / Gene and protein expression by JAK-STAT signaling after Interleukin-12 stimulation / catalytic step 2 spliceosome / mRNA Splicing - Major Pathway / RNA splicing / stem cell differentiation / negative regulation of smooth muscle cell proliferation / spliceosomal complex / B-WICH complex positively regulates rRNA expression / negative regulation of protein catabolic process / cytoplasmic ribonucleoprotein granule / fibrillar center / mRNA processing / mRNA splicing, via spliceosome / positive regulation of neuron projection development / nuclear matrix / transcription corepressor activity / snRNP Assembly / SARS-CoV-2 modulates host translation machinery / spermatogenesis / single-stranded RNA binding / RNA helicase activity / nuclear body / ribosome / RNA helicase / nuclear speck / chromatin remodeling / mRNA binding / protein-containing complex binding / nucleolus / positive regulation of DNA-templated transcription / enzyme binding / protein homodimerization activity / ATP hydrolysis activity / positive regulation of transcription by RNA polymerase II / DNA binding
Similarity search - Function
DnaJ homolog subfamily C member 8 / Splicing factor 1, helix-hairpin domain / : / Splicing factor 1 helix-hairpin domain / snRNP70, RNA recognition motif / U1 small nuclear ribonucleoprotein C / KH domain-containing BBP-like / U1 small nuclear ribonucleoprotein of 70kDa N-terminal / U1 small nuclear ribonucleoprotein of 70kDa MW N terminal / U1-C, C2H2-type zinc finger ...DnaJ homolog subfamily C member 8 / Splicing factor 1, helix-hairpin domain / : / Splicing factor 1 helix-hairpin domain / snRNP70, RNA recognition motif / U1 small nuclear ribonucleoprotein C / KH domain-containing BBP-like / U1 small nuclear ribonucleoprotein of 70kDa N-terminal / U1 small nuclear ribonucleoprotein of 70kDa MW N terminal / U1-C, C2H2-type zinc finger / U1 zinc finger / SF3B4, RNA recognition motif 2 / Splicing factor SF3a60 binding domain / Splicing factor SF3a60 binding domain / : / Replication stress response SDE2 C-terminal / Cactus-binding C-terminus of cactin protein / Splicing factor 3A subunit 1, ubiquitin domain / U2 small nuclear ribonucleoprotein B'', RNA recognition motif 2 / U2 small nuclear ribonucleoprotein B'', RNA recognition motif 1 / SF3A2 domain / Pre-mRNA-splicing factor SF3a complex subunit 2 (Prp11) / Splicing factor SF3a60 /Prp9 subunit, C-terminal / SF3A3 domain / SF3B4, RNA recognition motif 1 / SF3a60/Prp9 C-terminal / Pre-mRNA-splicing factor SF3A3, of SF3a complex, Prp9 / Splicing factor 3B, subunit 5 / Splicing factor 3A subunit 1 / U1 small nuclear ribonucleoprotein A, RNA recognition motif 2 / Splicing factor 3B subunit 1 / Splicing factor 3B subunit 1 / Splicing factor 3A subunit 1, conserved domain / Pre-mRNA splicing factor PRP21 like protein / Domain of unknown function DUF382 / Domain of unknown function (DUF382) / U1 small nuclear ribonucleoprotein A, RNA recognition motif 1 / SWAP/Surp / SWAP/Surp superfamily / Surp module / Zinc-finger of C2H2 type / SURP motif repeat profile. / Suppressor-of-White-APricot splicing regulator / PHF5-like / PHF5-like protein / PSP, proline-rich / PSP / proline-rich domain in spliceosome associated proteins / Splicing factor 3B subunit 5/RDS3 complex subunit 10 / Splicing factor 3B subunit 10 (SF3b10) / Small ribonucleoprotein associated, SmB/SmN / Splicing factor 3B subunit 1-like / Matrin/U1-C, C2H2-type zinc finger / Zinc finger matrin-type profile. / Small nuclear ribonucleoprotein D1 / U2A'/phosphoprotein 32 family A, C-terminal / occurring C-terminal to leucine-rich repeats / Leucine-rich repeat / SAP domain / SAP motif profile. / Putative DNA-binding (bihelical) motif predicted to be involved in chromosomal organisation / SAP domain / KH domain / DnaJ domain / K Homology domain, type 1 / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein F / Sm-like protein Lsm7/SmG / Like-Sm (LSM) domain containing protein, LSm4/SmD1/SmD3 / Matrin/U1-C-like, C2H2-type zinc finger / U1-like zinc finger / Sm-like protein Lsm6/SmF / DnaJ molecular chaperone homology domain / dnaJ domain profile. / LSM domain / LSM domain, eukaryotic/archaea-type / snRNP Sm proteins / Chaperone J-domain superfamily / DnaJ domain / Type-1 KH domain profile. / Cleavage/polyadenylation specificity factor, A subunit, N-terminal / Mono-functional DNA-alkylating methyl methanesulfonate N-term / Cleavage/polyadenylation specificity factor, A subunit, C-terminal / CPSF A subunit region / : / Sm domain profile. / DEAD-box subfamily ATP-dependent helicases signature. / K Homology domain, type 1 superfamily / ATP-dependent RNA helicase DEAD-box, conserved site / RNA helicase, DEAD-box type, Q motif / DEAD-box RNA helicase Q motif profile. / LSM domain superfamily / Zinc finger C2H2 superfamily / Leucine-rich repeat profile. / DEAD/DEAH box helicase / DEAD/DEAH box helicase domain / Zinc finger C2H2-type
Similarity search - Domain/homology
spliceostatin A (form II) / : / : / RNA / RNA (> 10) / RNA (> 100) / Splicing factor 3B subunit 1 / DnaJ homolog subfamily C member 8 / U2 small nuclear ribonucleoprotein B'' / U1 small nuclear ribonucleoprotein 70 kDa ...spliceostatin A (form II) / : / : / RNA / RNA (> 10) / RNA (> 100) / Splicing factor 3B subunit 1 / DnaJ homolog subfamily C member 8 / U2 small nuclear ribonucleoprotein B'' / U1 small nuclear ribonucleoprotein 70 kDa / U1 small nuclear ribonucleoprotein A / U1 small nuclear ribonucleoprotein C / 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 3 / Splicing factor 3B subunit 4 / Splicing factor 3A subunit 2 / Splicing factor 3A subunit 1 / Splicing factor 1 / Probable ATP-dependent RNA helicase DDX46 / PHD finger-like domain-containing protein 5A / Splicing factor 3B subunit 5
Similarity search - Component
Biological speciesHomo sapiens (human)
unidentified adenovirus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsZhang, X. / Zhan, X. / Shi, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Struct Mol Biol / Year: 2024
Title: Structural insights into branch site proofreading by human spliceosome.
Authors: Xiaofeng Zhang / Xiechao Zhan / Tong Bian / Fenghua Yang / Pan Li / Yichen Lu / Zhihan Xing / Rongyan Fan / Qiangfeng Cliff Zhang / Yigong Shi /
Abstract: Selection of the pre-mRNA branch site (BS) by the U2 small nuclear ribonucleoprotein (snRNP) is crucial to prespliceosome (A complex) assembly. The RNA helicase PRP5 proofreads BS selection but the ...Selection of the pre-mRNA branch site (BS) by the U2 small nuclear ribonucleoprotein (snRNP) is crucial to prespliceosome (A complex) assembly. The RNA helicase PRP5 proofreads BS selection but the underlying mechanism remains unclear. Here we report the atomic structures of two sequential complexes leading to prespliceosome assembly: human 17S U2 snRNP and a cross-exon pre-A complex. PRP5 is anchored on 17S U2 snRNP mainly through occupation of the RNA path of SF3B1 by an acidic loop of PRP5; the helicase domain of PRP5 associates with U2 snRNA; the BS-interacting stem-loop (BSL) of U2 snRNA is shielded by TAT-SF1, unable to engage the BS. In the pre-A complex, an initial U2-BS duplex is formed; the translocated helicase domain of PRP5 stays with U2 snRNA and the acidic loop still occupies the RNA path. The pre-A conformation is specifically stabilized by the splicing factors SF1, DNAJC8 and SF3A2. Cancer-derived mutations in SF3B1 damage its association with PRP5, compromising BS proofreading. Together, these findings reveal key insights into prespliceosome assembly and BS selection or proofreading by PRP5.
History
DepositionOct 18, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 3, 2023Provider: repository / Type: Initial release
Revision 1.1May 22, 2024Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Splicing factor 3A subunit 2
D: Splicing factor 1
J: DnaJ homolog subfamily C member 8
H: U2 snRNA
1: Splicing factor 3B subunit 1
2: Splicing factor 3B subunit 2
3: Splicing factor 3B subunit 3
4: Splicing factor 3B subunit 4
5: Splicing factor 3B subunit 5
A: Splicing factor 3A subunit 1
C: Splicing factor 3A subunit 3
E: Probable ATP-dependent RNA helicase DDX46
F: U2 small nuclear ribonucleoprotein A'
G: U2 small nuclear ribonucleoprotein B''
a: Small nuclear ribonucleoprotein Sm D2
b: Small nuclear ribonucleoprotein F
c: Small nuclear ribonucleoprotein E
d: Small nuclear ribonucleoprotein G
e: Small nuclear ribonucleoprotein Sm D3
f: Small nuclear ribonucleoprotein-associated proteins B and B'
g: Small nuclear ribonucleoprotein Sm D1
I: pre-mRNA
K: 5SS
L: U1 snRNA
O: U1 small nuclear ribonucleoprotein 70 kDa
m: Small nuclear ribonucleoprotein F
h: Small nuclear ribonucleoprotein Sm D1
k: Small nuclear ribonucleoprotein-associated proteins B and B'
M: U1 small nuclear ribonucleoprotein A
n: Small nuclear ribonucleoprotein G
l: Small nuclear ribonucleoprotein E
i: Small nuclear ribonucleoprotein Sm D2
N: U1 small nuclear ribonucleoprotein C
j: Small nuclear ribonucleoprotein Sm D3
6: PHD finger-like domain-containing protein 5A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,405,82342
Polymers1,404,90735
Non-polymers9167
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: cross-linking
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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

#1: 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
#10: 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
#11: 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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Protein , 5 types, 6 molecules DJEfk6

#2: Protein Splicing factor 1 / / Mammalian branch point-binding protein / BBP / mBBP / Transcription factor ZFM1 / Zinc finger gene ...Mammalian branch point-binding protein / BBP / mBBP / Transcription factor ZFM1 / Zinc finger gene in MEN1 locus / Zinc finger protein 162


Mass: 68401.742 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15637
#3: Protein DnaJ homolog subfamily C member 8


Mass: 29900.764 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: O75937
#12: 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
#20: Protein Small nuclear ribonucleoprotein-associated proteins B and B' / snRNP-B / Sm protein B/B' / SmB/B'


Mass: 24642.131 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P14678
#28: Protein PHD finger-like domain-containing protein 5A / PHD finger-like domain protein 5A / Splicing factor 3B-associated 14 kDa protein / SF3b14b


Mass: 12427.524 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q7RTV0

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RNA chain , 4 types, 4 molecules HIKL

#4: RNA chain U2 snRNA / U2 spliceosomal RNA


Mass: 60186.445 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: GenBank: 340097
#22: RNA chain pre-mRNA / Primary transcript


Mass: 83089.961 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) unidentified adenovirus
#23: RNA chain 5SS


Mass: 3256.996 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) unidentified adenovirus
#24: RNA chain U1 snRNA / U1 spliceosomal RNA


Mass: 52697.070 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: GenBank: 1781322691

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Splicing factor 3B subunit ... , 5 types, 5 molecules 12345

#5: 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
#6: 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
#7: Protein Splicing factor 3B subunit 3 / Pre-mRNA-splicing factor SF3b 130 kDa subunit / SF3b130 / STAF130 / Spliceosome-associated protein ...Pre-mRNA-splicing factor SF3b 130 kDa subunit / SF3b130 / STAF130 / Spliceosome-associated protein 130 / SAP 130


Mass: 135718.844 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q15393
#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
#9: Protein Splicing factor 3B subunit 5 / SF3b5 / Pre-mRNA-splicing factor SF3b 10 kDa subunit


Mass: 10149.369 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q9BWJ5

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

#13: 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
#14: 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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Small nuclear ribonucleoprotein ... , 6 types, 12 molecules aibmcldnejgh

#15: Protein Small nuclear ribonucleoprotein Sm D2 / Sm-D2 / snRNP core protein D2


Mass: 13551.928 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62316
#16: Protein Small nuclear ribonucleoprotein F / snRNP-F / Sm protein F / SmF


Mass: 9734.171 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62306
#17: Protein Small nuclear ribonucleoprotein E / snRNP-E / Sm protein E / SmE


Mass: 10817.601 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62304
#18: Protein Small nuclear ribonucleoprotein G / snRNP-G / Sm protein G / SmG


Mass: 8508.084 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62308
#19: Protein Small nuclear ribonucleoprotein Sm D3 / Sm-D3 / snRNP core protein D3


Mass: 13940.308 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62318
#21: Protein Small nuclear ribonucleoprotein Sm D1 / Sm-D1 / Sm-D autoantigen / snRNP core protein D1


Mass: 13310.653 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P62314

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U1 small nuclear ribonucleoprotein ... , 3 types, 3 molecules OMN

#25: Protein U1 small nuclear ribonucleoprotein 70 kDa


Mass: 51683.184 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P08621
#26: Protein U1 small nuclear ribonucleoprotein A


Mass: 31319.533 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P09012
#27: Protein U1 small nuclear ribonucleoprotein C / U1 snRNP C / U1-C / U1C


Mass: 17415.727 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P09234

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Non-polymers , 2 types, 7 molecules

#29: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn
#30: Chemical ChemComp-SJT / spliceostatin A (form II) / [(~{Z},2~{S})-5-[[(2~{R},3~{R},5~{S},6~{S})-6-[(2~{E},4~{E})-5-[(2~{R},3~{R},4~{S},6~{S})-6-methoxy-4,6-dimethyl-3,4-bis(oxidanyl)oxan-2-yl]-3-methyl-penta-2,4-dienyl]-2,5-dimethyl-oxan-3-yl]amino]-5-oxidanylidene-pent-3-en-2-yl] ethanoate


Mass: 523.659 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C28H45NO8 / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY

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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
1human pre-A complexCOMPLEX#1, #28, #2-#270MULTIPLE SOURCES
2human pre-ACOMPLEX#1, #28, #2-#271NATURAL
3pre-mRNA, 5SSPrimary transcriptCOMPLEX#22-#231MULTIPLE SOURCES
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
32Homo sapiens (human)9606
Buffer solutionpH: 7.9
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: 2000 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 419522 / Symmetry type: POINT
RefinementHighest resolution: 3 Å

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