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- PDB-9pc8: Core Mediator of PIC-Med-SWI/SNF -

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Basic information

Entry
Database: PDB / ID: 9pc8
TitleCore Mediator of PIC-Med-SWI/SNF
Components
  • (Mediator of RNA polymerase II transcription subunit ...) x 16
  • DNA-directed RNA polymerase II subunit RPB1
KeywordsTRANSCRIPTION / SWI/SNF / PIC
Function / homology
Function and homology information


meiotic gene conversion / transcription open complex formation at RNA polymerase II promoter / TFIIH-class transcription factor complex binding / core mediator complex / negative regulation of ribosomal protein gene transcription by RNA polymerase II / mediator complex / Processing of Capped Intron-Containing Pre-mRNA / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / mRNA Capping ...meiotic gene conversion / transcription open complex formation at RNA polymerase II promoter / TFIIH-class transcription factor complex binding / core mediator complex / negative regulation of ribosomal protein gene transcription by RNA polymerase II / mediator complex / Processing of Capped Intron-Containing Pre-mRNA / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / mRNA Capping / Estrogen-dependent gene expression / Formation of TC-NER Pre-Incision Complex / RNA polymerase II transcribes snRNA genes / TP53 Regulates Transcription of DNA Repair Genes / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Initiation And Promoter Clearance / RNA Polymerase II Pre-transcription Events / RNA-templated transcription / TFIIB-class transcription factor binding / Gap-filling DNA repair synthesis and ligation in TC-NER / termination of RNA polymerase II transcription / TFIID-class transcription factor complex binding / Dual incision in TC-NER / positive regulation of transcription initiation by RNA polymerase II / RNA polymerase II core promoter sequence-specific DNA binding / RNA polymerase II preinitiation complex assembly / cellular response to nutrient levels / RNA polymerase II, core complex / translesion synthesis / TBP-class protein binding / positive regulation of transcription elongation by RNA polymerase II / transcription initiation at RNA polymerase II promoter / transcription elongation by RNA polymerase II / mRNA transcription by RNA polymerase II / transcription by RNA polymerase II / transcription coregulator activity / cytoplasmic stress granule / DNA-directed RNA polymerase / transcription corepressor activity / DNA-directed RNA polymerase activity / cellular response to heat / DNA recombination / DNA-binding transcription factor binding / RNA polymerase II-specific DNA-binding transcription factor binding / transcription coactivator activity / protein-macromolecule adaptor activity / RNA polymerase II cis-regulatory region sequence-specific DNA binding / protein domain specific binding / DNA repair / regulation of transcription by RNA polymerase II / negative regulation of transcription by RNA polymerase II / structural molecule activity / positive regulation of transcription by RNA polymerase II / mitochondrion / DNA binding / metal ion binding / nucleus / cytosol
Similarity search - Function
Mediator complex, subunit Med19, fungi / Rox3 mediator complex subunit / Mediator of RNA polymerase II transcription subunit 22, Saccharomycetes / Mediator of RNA polymerase II transcription subunit 20 / Mediator complex, subunit Med6, fungi / Mediator complex, subunit Med10 / Transcription factor subunit Med10 of Mediator complex / Mediator of RNA polymerase II transcription subunit 9 / RNA polymerase II transcription mediator complex subunit 9 / Mediator complex, subunit Med4 ...Mediator complex, subunit Med19, fungi / Rox3 mediator complex subunit / Mediator of RNA polymerase II transcription subunit 22, Saccharomycetes / Mediator of RNA polymerase II transcription subunit 20 / Mediator complex, subunit Med6, fungi / Mediator complex, subunit Med10 / Transcription factor subunit Med10 of Mediator complex / Mediator of RNA polymerase II transcription subunit 9 / RNA polymerase II transcription mediator complex subunit 9 / Mediator complex, subunit Med4 / Vitamin-D-receptor interacting Mediator subunit 4 / Mediator complex, subunit Med31 / Mediator complex, subunit Med21 / Mediator of RNA polymerase II, subunit Med31 superfamily / SOH1 / Subunit 21 of Mediator complex / Mediator complex, subunit Med7 / Mediator complex, subunit Med7/Med21-like / Mediator complex, subunit Med7 superfmaily / : / : / MED7 protein / Mediator complex, subunit Med20 / Mediator complex, subunit Med14 / TATA-binding related factor (TRF) of subunit 20 of Mediator complex / Mediator complex subunit MED14 / Mediator complex, subunit Med6 / Mediator complex, subunit Med17 / Mediator complex, subunit Med6 superfamily / MED6 mediator sub complex component / Subunit 17 of Mediator complex / Mediator of RNA polymerase II transcription subunit 22 / Mediator complex, subunit Med8, fungi/metazoa / Mediator complex, subunit Med11 / Surfeit locus protein 5 subunit 22 of Mediator complex / Mediator of RNA polymerase II transcription complex subunit 8 / Mediator complex protein / Mediator complex, subunit Med18 / Med18 protein / Mediator complex, subunit Med1 / Mediator of RNA polymerase II transcription subunit 1 / RNA polymerase Rpb1 C-terminal repeat / RNA polymerase II, heptapeptide repeat, eukaryotic / Eukaryotic RNA polymerase II heptapeptide repeat. / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 7 / RNA polymerase Rpb1, domain 7 superfamily / RNA polymerase Rpb1, domain 7 / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb1, domain 3 superfamily / RNA polymerase Rpb1, clamp domain superfamily / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase, N-terminal / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase I subunit A N-terminus
Similarity search - Domain/homology
DNA-directed RNA polymerase II subunit RPB1 / Mediator of RNA polymerase II transcription subunit 14 / Mediator of RNA polymerase II transcription subunit 19 / Mediator of RNA polymerase II transcription subunit 17 / Mediator of RNA polymerase II transcription subunit 22 / Mediator of RNA polymerase II transcription subunit 18 / Mediator of RNA polymerase II transcription subunit 9 / Mediator of RNA polymerase II transcription subunit 20 / Mediator of RNA polymerase II transcription subunit 8 / Mediator of RNA polymerase II transcription subunit 31 ...DNA-directed RNA polymerase II subunit RPB1 / Mediator of RNA polymerase II transcription subunit 14 / Mediator of RNA polymerase II transcription subunit 19 / Mediator of RNA polymerase II transcription subunit 17 / Mediator of RNA polymerase II transcription subunit 22 / Mediator of RNA polymerase II transcription subunit 18 / Mediator of RNA polymerase II transcription subunit 9 / Mediator of RNA polymerase II transcription subunit 20 / Mediator of RNA polymerase II transcription subunit 8 / Mediator of RNA polymerase II transcription subunit 31 / Mediator of RNA polymerase II transcription subunit 6 / Mediator of RNA polymerase II transcription subunit 21 / Mediator of RNA polymerase II transcription subunit 10 / Mediator of RNA polymerase II transcription subunit 7 / Mediator of RNA polymerase II transcription subunit 1 / Mediator of RNA polymerase II transcription subunit 4 / Mediator of RNA polymerase II transcription subunit 11
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsYang, C. / Nagai, S. / Chen, D.-H.
Funding support United States, 1items
OrganizationGrant numberCountry
Other private United States
CitationJournal: To Be Published
Title: Structure of Core Mediator of PIC-Med-SWI/SNF
Authors: Yang, C. / Nagai, S. / Chen, D.-H.
History
DepositionJun 27, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 30, 2026Provider: repository / Type: Initial release
Revision 1.0Sep 30, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
f: Mediator of RNA polymerase II transcription subunit 20
h: Mediator of RNA polymerase II transcription subunit 4
n: Mediator of RNA polymerase II transcription subunit 21
o: Mediator of RNA polymerase II transcription subunit 31
j: Mediator of RNA polymerase II transcription subunit 9
d: Mediator of RNA polymerase II transcription subunit 17
A: DNA-directed RNA polymerase II subunit RPB1
p: Mediator of RNA polymerase II transcription subunit 1
a: Mediator of RNA polymerase II transcription subunit 6
b: Mediator of RNA polymerase II transcription subunit 8
c: Mediator of RNA polymerase II transcription subunit 11
e: Mediator of RNA polymerase II transcription subunit 18
g: Mediator of RNA polymerase II transcription subunit 22
i: Mediator of RNA polymerase II transcription subunit 7
k: Mediator of RNA polymerase II transcription subunit 10
l: Mediator of RNA polymerase II transcription subunit 14
m: Mediator of RNA polymerase II transcription subunit 19


Theoretical massNumber of molelcules
Total (without water)749,71217
Polymers749,71217
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Mediator of RNA polymerase II transcription subunit ... , 16 types, 16 molecules fhnojdpabcegiklm

#1: Protein Mediator of RNA polymerase II transcription subunit 20 / Hyper-recombination suppressor protein 2 / Mediator complex subunit 20 / Suppressor of RNA polymerase B 2


Mass: 22918.068 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P34162
#2: Protein Mediator of RNA polymerase II transcription subunit 4 / Mediator complex subunit 4


Mass: 32244.895 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q12343
#3: Protein Mediator of RNA polymerase II transcription subunit 21 / Mediator complex subunit 21 / RNAPII complex component SRB7 / Suppressor of RNA polymerase B 7


Mass: 16093.368 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P47822
#4: Protein Mediator of RNA polymerase II transcription subunit 31 / Hpr1 suppressor protein 1 / Mediator complex subunit 31


Mass: 14747.739 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P38633
#5: Protein Mediator of RNA polymerase II transcription subunit 9 / Chromosome segregation protein 2 / Mediator complex subunit 9


Mass: 17400.377 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P33308
#6: Protein Mediator of RNA polymerase II transcription subunit 17 / Mediator complex subunit 17 / Suppressor of RNA polymerase B 4


Mass: 78582.836 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P32569
#8: Protein Mediator of RNA polymerase II transcription subunit 1 / Mediator complex subunit 1


Mass: 64314.953 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q12321
#9: Protein Mediator of RNA polymerase II transcription subunit 6 / Mediator complex subunit 6


Mass: 32844.746 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P38782
#10: Protein Mediator of RNA polymerase II transcription subunit 8 / Mediator complex subunit 8


Mass: 25297.234 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P38304
#11: Protein Mediator of RNA polymerase II transcription subunit 11 / Mediator complex subunit 11


Mass: 13324.189 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q99278
#12: Protein Mediator of RNA polymerase II transcription subunit 18 / Mediator complex subunit 18 / Suppressor of RNA polymerase B 5


Mass: 34316.539 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P32585
#13: Protein Mediator of RNA polymerase II transcription subunit 22 / Mediator complex subunit 22 / Suppressor of RNA polymerase B 6


Mass: 13875.731 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P32570
#14: Protein Mediator of RNA polymerase II transcription subunit 7 / Mediator complex subunit 7


Mass: 25616.062 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q08278
#15: Protein Mediator of RNA polymerase II transcription subunit 10 / Mediator complex subunit 10 / Negative regulator of URS2 protein 2


Mass: 17927.926 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: Q06213
#16: Protein Mediator of RNA polymerase II transcription subunit 14 / Glucose repression regulatory protein 1 / Mediator complex subunit 14


Mass: 123500.695 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P19263
#17: Protein Mediator of RNA polymerase II transcription subunit 19 / Hypoxic gene repressor protein 3 / Mediator complex subunit 19 / Negative regulator of URS2 protein ...Hypoxic gene repressor protein 3 / Mediator complex subunit 19 / Negative regulator of URS2 protein 3 / SNF1 suppressor protein 7


Mass: 24885.305 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P25046

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Protein , 1 types, 1 molecules A

#7: Protein DNA-directed RNA polymerase II subunit RPB1 / RNA polymerase II subunit 1 / RNA polymerase II subunit B1 / DNA-directed RNA polymerase III ...RNA polymerase II subunit 1 / RNA polymerase II subunit B1 / DNA-directed RNA polymerase III largest subunit / RNA polymerase II subunit B220


Mass: 191821.578 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P04050, DNA-directed RNA polymerase

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Details

Has protein modificationN

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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: Core Mediator of PIC-Med-SWI/SNF / Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightValue: 2 MDa / Experimental value: YES
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 7.5
Details: 40 mM Hepes-KOH pH 7.5, 100 mM potassium acetate, 2 mM magnesium acetate and 5 mM DTT
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 64000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 4 sec. / Electron dose: 40.8 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
1RELION5particle selection
2PHENIX1.20.1_4487model refinement
13cryoSPARC3D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1482227 / Details: cryoPSARC's Local refinement / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Atomic model buildingPDB-ID: 8cen

8cen


Accession code: 8cen / Source name: PDB / Type: experimental model
RefinementStereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00529813
ELECTRON MICROSCOPYf_angle_d1.00840282
ELECTRON MICROSCOPYf_dihedral_angle_d6.083870
ELECTRON MICROSCOPYf_chiral_restr0.0594620
ELECTRON MICROSCOPYf_plane_restr0.0085128

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