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- PDB-6bk8: S. cerevisiae spliceosomal post-catalytic P complex -

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Basic information

Entry
Database: PDB / ID: 6bk8
TitleS. cerevisiae spliceosomal post-catalytic P complex
Components
  • (Pre-mRNA-processing factor ...) x 2
  • (Pre-mRNA-splicing factor ...) x 17
  • (Small nuclear ribonucleoprotein ...) x 6
  • (Unknown protein ...) x 2
  • Lea1
  • Msl1
  • Pre-mRNA-processing protein 45
  • RNA (34-MER)
  • RNA (59-MER)
  • Small nuclear ribonucleoprotein-associated protein B
  • U2 snRNA
  • U5 snRNA
  • U6 snRNA
KeywordsRNA BINDING PROTEIN / pre-mRNA splicing / spliceosome / post-catalytic / P complex
Function / homology
Function and homology information


U2-type post-spliceosomal complex / mRNA branch site recognition / U2-type post-mRNA release spliceosomal complex / spliceosomal complex disassembly / cellular bud site selection / pre-mRNA 3'-splice site binding / post-mRNA release spliceosomal complex / nuclear mRNA surveillance / generation of catalytic spliceosome for first transesterification step / cis assembly of pre-catalytic spliceosome ...U2-type post-spliceosomal complex / mRNA branch site recognition / U2-type post-mRNA release spliceosomal complex / spliceosomal complex disassembly / cellular bud site selection / pre-mRNA 3'-splice site binding / post-mRNA release spliceosomal complex / nuclear mRNA surveillance / generation of catalytic spliceosome for first transesterification step / cis assembly of pre-catalytic spliceosome / splicing factor binding / U4/U6 snRNP / spliceosome conformational change to release U4 (or U4atac) and U1 (or U11) / 7-methylguanosine cap hypermethylation / Prp19 complex / pICln-Sm protein complex / snRNP binding / U2-type catalytic step 1 spliceosome / small nuclear ribonucleoprotein complex / pre-mRNA binding / SMN-Sm protein complex / spliceosomal tri-snRNP complex / U2-type spliceosomal complex / mRNA cis splicing, via spliceosome / poly(U) RNA binding / commitment complex / U2-type prespliceosome assembly / U2-type catalytic step 2 spliceosome / U4 snRNP / U2 snRNP / U1 snRNP / U2-type prespliceosome / precatalytic spliceosome / Formation of TC-NER Pre-Incision Complex / generation of catalytic spliceosome for second transesterification step / spliceosomal complex assembly / DNA replication origin binding / mRNA 5'-splice site recognition / Gap-filling DNA repair synthesis and ligation in TC-NER / protein K63-linked ubiquitination / mRNA 3'-splice site recognition / Dual incision in TC-NER / spliceosomal tri-snRNP complex assembly / DNA replication initiation / U5 snRNA binding / U5 snRNP / U2 snRNA binding / U6 snRNA binding / spliceosomal snRNP assembly / positive regulation of cell cycle / pre-mRNA intronic binding / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / nuclear periphery / positive regulation of RNA splicing / spliceosomal complex / RING-type E3 ubiquitin transferase / mRNA splicing, via spliceosome / ubiquitin-protein transferase activity / metallopeptidase activity / ubiquitin protein ligase activity / RNA helicase activity / RNA helicase / DNA repair / GTPase activity / mRNA binding / chromatin binding / chromatin / GTP binding / ATP hydrolysis activity / mitochondrion / DNA binding / RNA binding / zinc ion binding / ATP binding / identical protein binding / nucleus / metal ion binding / cytosol / cytoplasm
Similarity search - Function
RNA Binding Protein, Prp18; Chain A / Functional domain of the splicing factor Prp18 / Prp18 / Pre-mRNA-splicing factor 18 / Prp18 domain / Pre-mRNA-splicing factor SLU7 domain / Pre-mRNA-splicing factor SLU7 / Pre-mRNA splicing Prp18-interacting factor / DHX8/ Prp22, DEXH-box helicase domain / : ...RNA Binding Protein, Prp18; Chain A / Functional domain of the splicing factor Prp18 / Prp18 / Pre-mRNA-splicing factor 18 / Prp18 domain / Pre-mRNA-splicing factor SLU7 domain / Pre-mRNA-splicing factor SLU7 / Pre-mRNA splicing Prp18-interacting factor / DHX8/ Prp22, DEXH-box helicase domain / : / : / cwf21 / Slt11, RNA recognition motif / Pre-mRNA-splicing factor Cwc2, RNA recognition motif / Torus domain / Torus domain / mRNA splicing factor SYF2 / SYF2 splicing factor / RNA recognition motif. (a.k.a. RRM, RBD, or RNP domain) / : / : / mRNA splicing factor Cwf21 domain / cwf21 domain / Pre-mRNA-processing factor 17 / HAT (Half-A-TPR) repeat / Pre-mRNA-splicing factor 19 / Pre-mRNA-processing factor 19 / Prp19/Pso4-like / BUD31/G10-related, conserved site / G10 protein signature 1. / G10 protein signature 2. / : / STL11, N-terminal / SKI-interacting protein SKIP, SNW domain / SKI-interacting protein, SKIP / SKIP/SNW domain / Pre-mRNA-splicing factor Cwf15/Cwc15 / Suppressor of forked / Cwf15/Cwc15 cell cycle control protein / Suppressor of forked protein (Suf) / WD repeat Prp46/PLRG1-like / Pre-mRNA-splicing factor Cwc2/Slt11 / G10 protein / Pre-mRNA-splicing factor BUD31 / Pre-mRNA splicing factor component Cdc5p/Cef1, C-terminal / : / : / pre-mRNA splicing factor component / Initiation factor eIF-4 gamma, MA3 / MA3 domain / MI domain profile. / Domain in DAP-5, eIF4G, MA-3 and other proteins. / Middle domain of eukaryotic initiation factor 4G (eIF4G) / MIF4G-like, type 3 / U-box domain profile. / Modified RING finger domain / U-box domain / U2A'/phosphoprotein 32 family A, C-terminal / occurring C-terminal to leucine-rich repeats / : / Helicase associated domain (HA2), ratchet-like / Leucine-rich repeat / DEAD-box helicase, OB fold / Oligonucleotide/oligosaccharide-binding (OB)-fold / Helicase associated domain (HA2), winged-helix / Helicase-associated domain / Pre-mRNA-splicing factor Syf1-like / Helicase associated domain (HA2) Add an annotation / 116kDa U5 small nuclear ribonucleoprotein component, N-terminal / 116kDa U5 small nuclear ribonucleoprotein component, C-terminal / Snu114, GTP-binding domain / 116 kDa U5 small nuclear ribonucleoprotein component N-terminus / SH3 type barrels. - #100 / Small nuclear ribonucleoprotein Sm D3 / : / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein F / Myb-type HTH DNA-binding domain profile. / Like-Sm (LSM) domain containing protein, LSm4/SmD1/SmD3 / Sm-like protein Lsm7/SmG / Zinc finger, CCCH-type / Zinc finger C3H1-type profile. / Sm-like protein Lsm6/SmF / LSM domain / LSM domain, eukaryotic/archaea-type / snRNP Sm proteins / HAT (Half-A-TPR) repeat / HAT (Half-A-TPR) repeats / Myb domain / Myb-like DNA-binding domain / : / Sm domain profile. / DNA/RNA helicase, ATP-dependent, DEAH-box type, conserved site / DEAH-box subfamily ATP-dependent helicases signature. / LSM domain superfamily / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV
Similarity search - Domain/homology
GUANOSINE-5'-TRIPHOSPHATE / INOSITOL HEXAKISPHOSPHATE / : / : / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Pre-mRNA-splicing factor ATP-dependent RNA helicase PRP22 ...GUANOSINE-5'-TRIPHOSPHATE / INOSITOL HEXAKISPHOSPHATE / : / : / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Pre-mRNA-splicing factor ATP-dependent RNA helicase PRP22 / Pre-mRNA-splicing factor BUD31 / Pre-mRNA-processing protein 45 / Pre-mRNA-processing factor 19 / Pre-mRNA-splicing factor 8 / Pre-mRNA-splicing factor 18 / Pre-mRNA-splicing factor SNU114 / Pre-mRNA-splicing factor SLT11 / Small nuclear ribonucleoprotein-associated protein B / Small nuclear ribonucleoprotein G / U2 small nuclear ribonucleoprotein B'' / Pre-mRNA-processing factor 17 / Small nuclear ribonucleoprotein Sm D3 / Pre-mRNA-splicing factor SYF2 / Pre-mRNA-splicing factor CWC22 / Small nuclear ribonucleoprotein F / Small nuclear ribonucleoprotein Sm D1 / Pre-mRNA-splicing factor SLU7 / Pre-mRNA-splicing factor CWC21 / Pre-mRNA-splicing factor CEF1 / Pre-mRNA-splicing factor CWC15 / Pre-mRNA-splicing factor SYF1 / Pre-mRNA-splicing factor SNT309 / Small nuclear ribonucleoprotein Sm D2 / U2 small nuclear ribonucleoprotein A' / Pre-mRNA-splicing factor CWC2 / Pre-mRNA-splicing factor CLF1 / Small nuclear ribonucleoprotein E / Pre-mRNA-splicing factor PRP46
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsLiu, S. / Li, X. / Zhou, Z.H. / Zhao, R.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM114178 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM071940 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI094386 United States
CitationJournal: Science / Year: 2017
Title: Structure of the yeast spliceosomal postcatalytic P complex.
Authors: Shiheng Liu / Xueni Li / Lingdi Zhang / Jiansen Jiang / Ryan C Hill / Yanxiang Cui / Kirk C Hansen / Z Hong Zhou / Rui Zhao /
Abstract: The spliceosome undergoes dramatic changes in a splicing cycle. Structures of B, B, C, C*, and intron lariat spliceosome complexes revealed mechanisms of 5'-splice site (ss) recognition, branching, ...The spliceosome undergoes dramatic changes in a splicing cycle. Structures of B, B, C, C*, and intron lariat spliceosome complexes revealed mechanisms of 5'-splice site (ss) recognition, branching, and intron release, but lacked information on 3'-ss recognition, exon ligation, and exon release. Here we report a cryo-electron microscopy structure of the postcatalytic P complex at 3.3-angstrom resolution, revealing that the 3' ss is mainly recognized through non-Watson-Crick base pairing with the 5' ss and branch point. Furthermore, one or more unidentified proteins become stably associated with the P complex, securing the 3' exon and potentially regulating activity of the helicase Prp22. Prp22 binds nucleotides 15 to 21 in the 3' exon, enabling it to pull the intron-exon or ligated exons in a 3' to 5' direction to achieve 3'-ss proofreading or exon release, respectively.
History
DepositionNov 7, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 21, 2018Provider: repository / Type: Initial release
Revision 1.1Feb 28, 2018Group: Author supporting evidence / Database references / Structure summary
Category: citation / entity / pdbx_audit_support
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title / _entity.pdbx_description / _pdbx_audit_support.funding_organization
Revision 1.2Dec 11, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.3Oct 14, 2020Group: Advisory / Derived calculations / Structure summary
Category: chem_comp / pdbx_unobs_or_zero_occ_atoms ...chem_comp / pdbx_unobs_or_zero_occ_atoms / pdbx_validate_close_contact / struct_conn / struct_conn_type
Item: _chem_comp.pdbx_synonyms
Revision 1.4Nov 20, 2024Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_admin.last_update

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Assembly

Deposited unit
2: U2 snRNA
5: U5 snRNA
6: U6 snRNA
e: RNA (34-MER)
i: RNA (59-MER)
A: Pre-mRNA-splicing factor Prp8
B: Pre-mRNA-splicing factor SNU114
D: Pre-mRNA-splicing factor PRP46
E: Pre-mRNA-processing protein 45
F: Pre-mRNA-splicing factor SLT11
G: Pre-mRNA-splicing factor CWC2
H: Pre-mRNA-splicing factor CWC15
I: Pre-mRNA-splicing factor BUD31
K: Pre-mRNA-splicing factor CWC21
L: Pre-mRNA-splicing factor CWC22
M: Pre-mRNA-processing factor Prp17
N: Pre-mRNA-splicing factor Prp18
O: Pre-mRNA-splicing factor SLU7
P: Pre-mRNA-splicing factor ATP-dependent RNA helicase PRP22
R: Pre-mRNA-splicing factor SYF2
S: Pre-mRNA-splicing factor CEF1
T: Pre-mRNA-splicing factor CLF1
U: Pre-mRNA-splicing factor SYF1
X: Unknown protein fragment
Y: Unknown protein fragment
a: Small nuclear ribonucleoprotein Sm D2
b: Small nuclear ribonucleoprotein F
c: Small nuclear ribonucleoprotein E
d: Small nuclear ribonucleoprotein G
f: Small nuclear ribonucleoprotein-associated protein B
g: Small nuclear ribonucleoprotein Sm D3
h: Small nuclear ribonucleoprotein Sm D1
k: Small nuclear ribonucleoprotein-associated protein B
l: Small nuclear ribonucleoprotein E
m: Small nuclear ribonucleoprotein F
n: Small nuclear ribonucleoprotein G
o: Small nuclear ribonucleoprotein Sm D3
p: Small nuclear ribonucleoprotein Sm D1
q: Small nuclear ribonucleoprotein Sm D2
r: Lea1
s: Msl1
u: Pre-mRNA-processing factor Prp19
v: Pre-mRNA-processing factor Prp19
w: Pre-mRNA-processing factor Prp19
x: Pre-mRNA-processing factor Prp19
y: Pre-mRNA-splicing factor SNT309
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,221,62460
Polymers2,219,86146
Non-polymers1,76314
Water00
1


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

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Components

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RNA chain , 5 types, 5 molecules 256ei

#1: RNA chain U2 snRNA


Mass: 376267.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: GenBank: 536627
#2: RNA chain U5 snRNA


Mass: 68643.344 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: GenBank: 1039024040
#3: RNA chain U6 snRNA


Mass: 35883.176 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: GenBank: 1039023280
#4: RNA chain RNA (34-MER)


Mass: 10680.198 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)
#5: RNA chain RNA (59-MER)


Mass: 18717.949 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)

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Pre-mRNA-splicing factor ... , 17 types, 17 molecules ABDFGHIKLNOPRSTUy

#6: Protein Pre-mRNA-splicing factor Prp8


Mass: 279867.469 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P33334
#7: Protein Pre-mRNA-splicing factor SNU114 / 114 kDa U5 small nuclear ribonucleoprotein component / Growth inhibitory protein 10


Mass: 114174.008 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P36048
#8: Protein Pre-mRNA-splicing factor PRP46 / Complexed with CEF1 protein 1 / PRP nineteen-associated complex protein 50 / PRP19-associated ...Complexed with CEF1 protein 1 / PRP nineteen-associated complex protein 50 / PRP19-associated complex protein 50 / Pre-mRNA-processing protein 46


Mass: 50771.289 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q12417
#10: Protein Pre-mRNA-splicing factor SLT11 / Extracellular mutant protein 2 / Synthetic lethality with U2 protein 11


Mass: 40988.590 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P38241
#11: Protein Pre-mRNA-splicing factor CWC2 / Complexed with CEF1 protein 2 / PRP19-associated complex protein 40 / Synthetic lethal with CLF1 protein 3


Mass: 38486.562 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q12046
#12: Protein Pre-mRNA-splicing factor CWC15 / Complexed with CEF1 protein 15


Mass: 19975.195 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q03772
#13: Protein Pre-mRNA-splicing factor BUD31 / Bud site selection protein 31 / Complexed with CEF1 protein 14


Mass: 18484.502 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P25337
#14: Protein Pre-mRNA-splicing factor CWC21 / Complexed with CEF1 protein 21


Mass: 15793.596 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q03375
#15: Protein Pre-mRNA-splicing factor CWC22 / Complexed with CEF1 protein 22


Mass: 67386.062 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P53333
#17: Protein Pre-mRNA-splicing factor Prp18


Mass: 28414.391 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P33411
#18: Protein Pre-mRNA-splicing factor SLU7 / Synthetic lethal with U2 snRNA protein 17 / Synthetic lethal with U5 snRNA protein 7


Mass: 44722.875 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q02775
#19: Protein Pre-mRNA-splicing factor ATP-dependent RNA helicase PRP22


Mass: 130187.359 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P24384, RNA helicase
#20: Protein Pre-mRNA-splicing factor SYF2 / PRP19 complex protein 31 / Synthetic lethal with CDC40 protein 2


Mass: 24850.719 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P53277
#21: Protein Pre-mRNA-splicing factor CEF1 / PRP nineteen-associated complex protein 85 / PRP19-associated complex protein 85


Mass: 67837.773 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q03654
#22: Protein Pre-mRNA-splicing factor CLF1 / Crooked neck-like factor 1 / PRP19-associated complex protein 77 / Synthetic lethal with CDC40 protein 3


Mass: 82555.859 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q12309
#23: Protein Pre-mRNA-splicing factor SYF1 / PRP19-associated complex protein 90 / Synthetic lethal with CDC40 protein 1


Mass: 100344.016 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q04048
#36: Protein Pre-mRNA-splicing factor SNT309 / PRP19-associated complex protein 25 / Synergistic to PRP19 mutation protein 309


Mass: 20741.455 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q06091

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Protein , 4 types, 5 molecules Efkrs

#9: Protein Pre-mRNA-processing protein 45


Mass: 42548.727 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P28004
#30: Protein Small nuclear ribonucleoprotein-associated protein B / snRNP-B / Sm protein B / SmB


Mass: 22426.990 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P40018
#33: Protein Lea1 / U2 snRNP B'' / U2 small nuclear ribonucleoprotein B''


Mass: 12850.944 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P40567
#34: Protein Msl1 / U2 small nuclear ribonucleoprotein A' / U2 snRNP A' / Looks exceptionally like U2A protein 1


Mass: 27232.252 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q08963

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Pre-mRNA-processing factor ... , 2 types, 5 molecules Muvwx

#16: Protein Pre-mRNA-processing factor Prp17 / Cell division control protein 40


Mass: 52128.762 Da / Num. of mol.: 1 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P40968
#35: Protein
Pre-mRNA-processing factor Prp19 / RING-type E3 ubiquitin transferase PRP19


Mass: 56629.777 Da / Num. of mol.: 4 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
References: UniProt: P32523, RING-type E3 ubiquitin transferase

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Unknown protein ... , 2 types, 2 molecules XY

#24: Protein Unknown protein fragment


Mass: 18655.930 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)
#25: Protein/peptide Unknown protein fragment


Mass: 1379.692 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast)

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Small nuclear ribonucleoprotein ... , 6 types, 12 molecules aqbmcldngohp

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


Mass: 12876.066 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q06217
#27: Protein Small nuclear ribonucleoprotein F / snRNP-F / Sm protein F / SmF


Mass: 9669.945 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P54999
#28: Protein Small nuclear ribonucleoprotein E / snRNP-E / Sm protein E / SmE


Mass: 10385.098 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q12330
#29: Protein Small nuclear ribonucleoprotein G / snRNP-G / Sm protein G / SmG


Mass: 8490.809 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P40204
#31: Protein Small nuclear ribonucleoprotein Sm D3 / Sm-D3 / snRNP core protein D3


Mass: 11240.139 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: P43321
#32: Protein Small nuclear ribonucleoprotein Sm D1 / Sm-D1 / snRNP core protein D1


Mass: 16296.798 Da / Num. of mol.: 2 / Source method: isolated from a natural source
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c / References: UniProt: Q02260

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Non-polymers , 4 types, 14 molecules

#37: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Mg
#38: Chemical ChemComp-IHP / INOSITOL HEXAKISPHOSPHATE / MYO-INOSITOL HEXAKISPHOSPHATE / INOSITOL 1,2,3,4,5,6-HEXAKISPHOSPHATE


Mass: 660.035 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H18O24P6
#39: Chemical ChemComp-GTP / GUANOSINE-5'-TRIPHOSPHATE


Mass: 523.180 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H16N5O14P3 / Comment: GTP, energy-carrying molecule*YM
#40: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: Zn

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Details

Has protein modificationY

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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: Spliceosomal P complex / Type: COMPLEX / Entity ID: #1-#36 / Source: NATURAL
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
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 FIELD
Image recordingElectron dose: 2 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1Leginon2image acquisition
3CTFFIND4CTF correction
9RELION2.1initial Euler assignment
10RELION2.1final Euler assignment
11RELION2.1classification
12RELION2.13D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 212219 / Symmetry type: POINT
Atomic model buildingDetails: The author states the following for the pre-mRNA model building: For regions in the intron or exon where no clear sequence preferences were observed (Spingola et al., PMID 10024174), U, A, ...Details: The author states the following for the pre-mRNA model building: For regions in the intron or exon where no clear sequence preferences were observed (Spingola et al., PMID 10024174), U, A, U, and A-U are used to represent a generic nucleotide, purine, pyrimidine, and standard Watson-Crick basepair, respectively, based on the EM density. Nucleotides -7 to +7 in the exon are modeled mostly as the preferred nucleotides in each position (Spingola et al. PMID 10024174) unless the density suggests otherwise. Some nucleotides in the intron seem to form basepairs with defined U2 or U6 snRNA sequence based on EM densities, and are modeled as complementary nucleotides to the corresponding U2 or U6 sequence unless the density suggests otherwise.

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