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- PDB-6j6h: Cryo-EM structure of the yeast B*-a1 complex at an average resolu... -

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Basic information

Entry
Database: PDB / ID: 6j6h
TitleCryo-EM structure of the yeast B*-a1 complex at an average resolution of 3.6 angstrom
Components
  • (Pre-mRNA-processing factor ...) x 2
  • (Pre-mRNA-splicing factor ...) x 15
  • (Small nuclear ribonucleoprotein ...) x 6
  • (U2 small nuclear ribonucleoprotein ...) x 2
  • ACT1 pre-mRNA
  • Pre-mRNA-processing protein 45
  • Small nuclear ribonucleoprotein-associated protein B
  • U2 snRNA
  • U5 snRNA
  • U6 snRNA
KeywordsSPLICING / spliceosome / B* complex / branching / snRNP / U snRNA
Function / homology
Function and homology information


post-spliceosomal complex / mRNA branch site recognition / U2-type post-mRNA release spliceosomal complex / cellular bud site selection / post-mRNA release spliceosomal complex / 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) ...post-spliceosomal complex / mRNA branch site recognition / U2-type post-mRNA release spliceosomal complex / cellular bud site selection / post-mRNA release spliceosomal complex / 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 / positive regulation of cell cycle / U5 snRNP / U2 snRNA binding / U6 snRNA binding / spliceosomal snRNP assembly / 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 / DNA repair / GTPase activity / mRNA binding / chromatin binding / chromatin / GTP binding / mitochondrion / DNA binding / RNA binding / identical protein binding / nucleus / metal ion binding / cytosol / cytoplasm
Similarity search - Function
cwf21 / Pre-mRNA-splicing factor Isy1 / Pre-mRNA-splicing factor Isy1 superfamily / Isy1-like splicing family / Slt11, RNA recognition motif / Pre-mRNA-splicing factor Cwc2, RNA recognition motif / Torus domain / Torus domain / mRNA splicing factor SYF2 / SYF2 splicing factor ...cwf21 / Pre-mRNA-splicing factor Isy1 / Pre-mRNA-splicing factor Isy1 superfamily / Isy1-like splicing family / Slt11, RNA recognition motif / Pre-mRNA-splicing factor Cwc2, RNA recognition motif / Torus domain / Torus domain / mRNA splicing factor SYF2 / SYF2 splicing factor / Helix hairpin bin domain superfamily / 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 / Leucine-rich repeat / Pre-mRNA-splicing factor Syf1-like / 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. / LSM domain superfamily / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV / Elongation factor G C-terminus / Elongation factor EFG, domain V-like / Elongation factor G C-terminus / Quinoprotein alcohol dehydrogenase-like superfamily / EF-G domain III/V-like / SANT SWI3, ADA2, N-CoR and TFIIIB'' DNA-binding domains / SANT/Myb domain / 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
Similarity search - Domain/homology
GUANOSINE-5'-TRIPHOSPHATE / INOSITOL HEXAKISPHOSPHATE / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Pre-mRNA-splicing factor ISY1 / Pre-mRNA-splicing factor BUD31 / Pre-mRNA-processing protein 45 ...GUANOSINE-5'-TRIPHOSPHATE / INOSITOL HEXAKISPHOSPHATE / : / RNA / RNA (> 10) / RNA (> 100) / RNA (> 1000) / Pre-mRNA-splicing factor ISY1 / Pre-mRNA-splicing factor BUD31 / Pre-mRNA-processing protein 45 / Pre-mRNA-processing factor 19 / Pre-mRNA-splicing factor 8 / 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 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 S288c (yeast)
Saccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsWan, R. / Bai, R. / Yan, C. / Lei, J. / Shi, Y.
Funding support China, 3items
OrganizationGrant numberCountry
National Natural Science Foundation of China31430020 China
National Natural Science Foundation of China31621092 China
Ministry of Science and Technology (China)2016YFA0501100 China
CitationJournal: Cell / Year: 2019
Title: Structures of the Catalytically Activated Yeast Spliceosome Reveal the Mechanism of Branching.
Authors: Ruixue Wan / Rui Bai / Chuangye Yan / Jianlin Lei / Yigong Shi /
Abstract: Pre-mRNA splicing is executed by the spliceosome. Structural characterization of the catalytically activated complex (B) is pivotal for understanding the branching reaction. In this study, we ...Pre-mRNA splicing is executed by the spliceosome. Structural characterization of the catalytically activated complex (B) is pivotal for understanding the branching reaction. In this study, we assembled the B complexes on two different pre-mRNAs from Saccharomyces cerevisiae and determined the cryo-EM structures of four distinct B complexes at overall resolutions of 2.9-3.8 Å. The duplex between U2 small nuclear RNA (snRNA) and the branch point sequence (BPS) is discretely away from the 5'-splice site (5'SS) in the three B complexes that are devoid of the step I splicing factors Yju2 and Cwc25. Recruitment of Yju2 into the active site brings the U2/BPS duplex into the vicinity of 5'SS, with the BPS nucleophile positioned 4 Å away from the catalytic metal M2. This analysis reveals the functional mechanism of Yju2 and Cwc25 in branching. These structures on different pre-mRNAs reveal substrate-specific conformations of the spliceosome in a major functional state.
History
DepositionJan 15, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 24, 2019Provider: repository / Type: Initial release
Revision 1.1Nov 6, 2019Group: Data collection / Other / Category: atom_sites / cell
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][1] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][2] / _atom_sites.fract_transf_matrix[3][3] / _cell.Z_PDB
Revision 2.0Oct 14, 2020Group: Atomic model / Data collection ...Atomic model / Data collection / Derived calculations / Non-polymer description / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_struct_conn_angle / struct_conn / struct_conn_type / struct_site
Item: _atom_site.Cartn_x / _atom_site.Cartn_y ..._atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.id / _chem_comp.name / _chem_comp.pdbx_synonyms / _entity.pdbx_description / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.conn_type_id / _struct_conn.id / _struct_conn.pdbx_dist_value / _struct_conn.pdbx_leaving_atom_flag / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_conn_type.id / _struct_site.details / _struct_site.pdbx_auth_comp_id

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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Pre-mRNA-splicing factor 8
C: Pre-mRNA-splicing factor SNU114
J: Pre-mRNA-splicing factor CWC21
O: Pre-mRNA-splicing factor PRP46
P: Pre-mRNA-processing protein 45
Q: Pre-mRNA-splicing factor SLT11
R: Pre-mRNA-splicing factor CWC2
S: Pre-mRNA-splicing factor CWC15
T: Pre-mRNA-splicing factor BUD31
Z: Pre-mRNA-splicing factor CWC22
c: Pre-mRNA-splicing factor CEF1
d: Pre-mRNA-splicing factor CLF1
I: Pre-mRNA-splicing factor SYF2
n: Pre-mRNA-processing factor 17
H: Pre-mRNA-splicing factor ISY1
B: ACT1 pre-mRNA
D: U5 snRNA
E: U6 snRNA
L: U2 snRNA
v: Pre-mRNA-splicing factor SYF1
a: U2 small nuclear ribonucleoprotein B''
b: U2 small nuclear ribonucleoprotein A'
t: Pre-mRNA-splicing factor SNT309
u: Small nuclear ribonucleoprotein E
m: Small nuclear ribonucleoprotein Sm D1
j: Small nuclear ribonucleoprotein G
h: Small nuclear ribonucleoprotein F
g: Small nuclear ribonucleoprotein Sm D2
k: Small nuclear ribonucleoprotein-associated protein B
e: Small nuclear ribonucleoprotein Sm D2
s: Small nuclear ribonucleoprotein-associated protein B
l: Small nuclear ribonucleoprotein Sm D3
i: Small nuclear ribonucleoprotein E
w: Small nuclear ribonucleoprotein F
x: Small nuclear ribonucleoprotein G
y: Small nuclear ribonucleoprotein Sm D3
z: Small nuclear ribonucleoprotein Sm D1
r: Pre-mRNA-processing factor 19
p: Pre-mRNA-processing factor 19
q: Pre-mRNA-processing factor 19
o: Pre-mRNA-processing factor 19
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,214,07855
Polymers2,212,35641
Non-polymers1,72114
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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Pre-mRNA-splicing factor ... , 15 types, 15 molecules ACJOQRSTZcdIHvt

#1: Protein Pre-mRNA-splicing factor 8


Mass: 279867.469 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae S288c (yeast) / References: UniProt: P33334
#2: 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
#3: 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
#4: 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
#6: 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
#7: 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
#8: 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
#9: 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
#10: 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
#11: 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
#12: 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
#13: 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
#15: Protein Pre-mRNA-splicing factor ISY1 / Interactor of SYF1 / PRP19-associated complex protein 30


Mass: 28073.836 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: P21374
#20: 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
#23: 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 , 2 types, 3 molecules Pks

#5: 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
#29: 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

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

#14: Protein Pre-mRNA-processing factor 17 / Cell division control protein 40


Mass: 52208.738 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
#31: Protein
Pre-mRNA-processing factor 19 / 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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RNA chain , 4 types, 4 molecules BDEL

#16: RNA chain ACT1 pre-mRNA


Mass: 217099.734 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae S288c (yeast) / Strain: S288c
#17: RNA chain U5 snRNA


Mass: 68643.344 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae S288c (yeast) / Strain: S288c
#18: RNA chain U6 snRNA


Mass: 35883.176 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae S288c (yeast) / References: GenBank: 1039023367
#19: RNA chain U2 snRNA


Mass: 376267.406 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae S288c (yeast) / Strain: S288c

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

#21: Protein U2 small nuclear ribonucleoprotein B'' / U2 snRNP 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
#22: Protein 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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Small nuclear ribonucleoprotein ... , 6 types, 12 molecules uimzjxhwgely

#24: 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
#25: 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
#26: 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
#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 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
#30: 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

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Non-polymers , 4 types, 14 molecules

#32: 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
#33: 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
#34: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Mg
#35: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn

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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: catalytically activated spliceosome B*-a1 complex / Type: COMPLEX / Entity ID: #1-#31 / Source: NATURAL
Molecular weightUnits: MEGADALTONS / Experimental value: YES
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Buffer solutionpH: 7.9
SpecimenConc.: 0.2 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: Quantifoil R1.2/1.3
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 / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: OTHER
Image recordingElectron dose: 49.3 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameVersionCategory
4Gctf1.06CTF correction
10RELION3initial Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 555036 / Symmetry type: POINT

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