EMDB-50325: Structure of Pol II-TC-NER-STK19 complex, composite map

Basic information

Entry

Database: EMDB / ID: EMD-50325

• Title: Structure of Pol II-TC-NER-STK19 complex, composite map
• Map data: composite map

Sample

• Complex: Ternary complex of Pol II-TC-NER-STK19, composite map
  • Protein or peptide: x 18 types
  • DNA: x 2 types
  • RNA: x 1 types
• Protein or peptide: x 1 types
• Ligand: x 2 types

• Keywords: Transcription-coupled DNA repair / TRANSCRIPTION

Function / homology

Function:

RNA polymerase inhibitor activity / regulation of transcription-coupled nucleotide-excision repair / negative regulation of double-strand break repair via nonhomologous end joining / nucleotide-excision repair complex / positive regulation of single strand break repair / response to auditory stimulus / regulation of transcription elongation by RNA polymerase II / B-WICH complex / DNA protection / single strand break repair / positive regulation by virus of viral protein levels in host cell / Formation of RNA Pol II elongation complex / Formation of the Early Elongation Complex / Transcriptional regulation by small RNAs / RNA Polymerase II Pre-transcription Events / TP53 Regulates Transcription of DNA Repair Genes / FGFR2 alternative splicing / RNA polymerase II transcribes snRNA genes / mRNA Capping / mRNA Splicing - Minor Pathway / Processing of Capped Intron-Containing Pre-mRNA / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Elongation / RNA Polymerase II Transcription Initiation And Promoter Clearance / RNA Pol II CTD phosphorylation and interaction with CE / Estrogen-dependent gene expression / response to superoxide / Formation of TC-NER Pre-Incision Complex / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / mRNA Splicing - Major Pathway / double-strand break repair via classical nonhomologous end joining / photoreceptor cell maintenance / chromatin-protein adaptor activity / ATP-dependent chromatin remodeler activity / spindle assembly involved in female meiosis / epigenetic programming in the zygotic pronuclei / UV-damage excision repair / positive regulation of Ras protein signal transduction / RNA polymerase binding / nuclear lumen / response to UV-B / positive regulation of DNA-templated transcription, elongation / biological process involved in interaction with symbiont / positive regulation of transcription by RNA polymerase III / regulation of mitotic cell cycle phase transition / WD40-repeat domain binding / Cul4A-RING E3 ubiquitin ligase complex / Cul4-RING E3 ubiquitin ligase complex / ATP-dependent DNA damage sensor activity / Cul4B-RING E3 ubiquitin ligase complex / ubiquitin ligase complex scaffold activity / negative regulation of reproductive process / negative regulation of developmental process / positive regulation of transcription by RNA polymerase I / RNA polymerase II complex binding / cullin family protein binding / protein tyrosine kinase activator activity / viral release from host cell / maintenance of transcriptional fidelity during transcription elongation by RNA polymerase II / RNA Polymerase I Transcription Initiation / site of DNA damage / pyrimidine dimer repair / response to X-ray / positive regulation of transcription initiation by RNA polymerase II / ectopic germ cell programmed cell death / ATP-dependent activity, acting on DNA / positive regulation of viral genome replication / RNA polymerase I complex / transcription elongation by RNA polymerase I / ubiquitin-like ligase-substrate adaptor activity / RNA polymerase III complex / response to UV / proteasomal protein catabolic process / positive regulation of double-strand break repair via homologous recombination / RNA polymerase II, core complex / tRNA transcription by RNA polymerase III / protein autoubiquitination / transcription by RNA polymerase I / JNK cascade / neurogenesis / transcription-coupled nucleotide-excision repair / positive regulation of gluconeogenesis / DNA-directed RNA polymerase complex / positive regulation of DNA repair / DNA damage checkpoint signaling / regulation of DNA-templated transcription elongation / transcription elongation factor complex / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / response to gamma radiation / nucleotide-excision repair / transcription initiation at RNA polymerase II promoter / transcription elongation by RNA polymerase II / DNA-templated transcription initiation / Recognition of DNA damage by PCNA-containing replication complex / helicase activity / base-excision repair / regulation of circadian rhythm

Domain/homology:

Serine-threonine protein kinase 19 / Inactive serine-threonine protein kinase 19 / UV-stimulated scaffold protein A / : / : / Uncharacterized conserved protein (DUF2043) / UVSSA N-terminal domain / Zinc finger UVSSA-type profile. / DNA excision repair protein Rad28/ERCC8/Ckn1/ATCSA-1 / : / DET1- and DDB1-associated protein 1, N-terminal / DET1- and DDB1-associated protein 1 / Det1 complexing ubiquitin ligase / Transcription elongation factor 1 / Transcription elongation factor 1 superfamily / Transcription elongation factor Elf1 like / ENTH/VHS / RSE1/DDB1/CPSF1 second beta-propeller / Cleavage/polyadenylation specificity factor, A subunit, C-terminal / Cleavage/polyadenylation specificity factor, A subunit, N-terminal / : / CPSF A subunit region / RSE1/DDB1/CPSF1 first beta-propeller / : / SNF2-like, N-terminal domain superfamily / SNF2, N-terminal / SNF2-related domain / DNA-directed RNA polymerase II subunit Rpb4-like / 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 Rpb4/RPC9, core / DNA-directed RNA-polymerase II subunit / RNA polymerase Rpb1, domain 7 / RNA polymerase Rpb1, domain 7 superfamily / RNA polymerase Rpb1, domain 7 / Pol II subunit B9, C-terminal zinc ribbon / RNA polymerase RBP11 / Rpb4/RPC9 superfamily / RNA polymerase subunit Rpb4/RPC9 / RNA polymerase Rpb4 / Zinc finger TFIIS-type signature. / RNA polymerase Rpb7-like , N-terminal / RNA polymerase Rpb7-like, N-terminal domain superfamily / RNA polymerase subunit Rpb7-like / SHS2 domain found in N terminus of Rpb7p/Rpc25p/MJ0397 / HRDC-like superfamily / RNA polymerase Rpb2, domain 5 / RNA polymerase Rpb2, domain 5 / RNA polymerase Rpb2, domain 4 / RNA polymerase Rpb2, domain 4 / DNA-directed RNA polymerase, M/15kDa subunit / RNA polymerases M/15 Kd subunit / RNA polymerase subunit 9 / DNA-directed RNA polymerase M, 15kDa subunit, conserved site / RNA polymerases M / 15 Kd subunits signature. / DNA-directed RNA polymerase subunit/transcription factor S / : / RNA polymerase, Rpb8 / DNA-directed RNA polymerases I, II, and III subunit RPABC4 / RNA polymerase Rpb8 / RNA polymerase subunit 8 / RNA polymerase, Rpb5, N-terminal / RNA polymerase Rpb5, N-terminal domain superfamily / RNA polymerase Rpb5, N-terminal domain / DNA-directed RNA polymerase, subunit RPB6 / DNA-directed RNA polymerase subunit RPABC5/Rpb10 / RNA polymerases, subunit N, zinc binding site / RNA polymerase subunit RPB10 / RNA polymerases N / 8 kDa subunit / RNA polymerases N / 8 Kd subunits signature. / DNA directed RNA polymerase, 7 kDa subunit / RNA polymerase archaeal subunit P/eukaryotic subunit RPABC4 / RNA polymerase, subunit H/Rpb5, conserved site / RNA polymerases H / 23 Kd subunits signature. / RNA polymerase subunit CX / DNA-directed RNA polymerase, 30-40kDa subunit, conserved site / DNA-directed RNA polymerase subunit Rpo3/Rpb3/RPAC1 / RNA polymerases D / 30 to 40 Kd subunits signature. / DNA-directed RNA polymerase Rpb11, 13-16kDa subunit, conserved site / DNA-directed RNA polymerase subunit Rpo11 / RNA polymerases L / 13 to 16 Kd subunits signature. / RNA polymerase subunit RPABC4/transcription elongation factor Spt4 / Zinc finger, TFIIS-type / Transcription factor S-II (TFIIS) / Zinc finger TFIIS-type profile. / C2C2 Zinc finger / DNA-directed RNA polymerase, RBP11-like dimerisation domain / RNA polymerase Rpb3/Rpb11 dimerisation domain / RNA polymerase, subunit H/Rpb5 C-terminal / DNA-directed RNA polymerase subunit Rpo5/Rpb5 / RPB5-like RNA polymerase subunit superfamily / RNA polymerase Rpb5, C-terminal domain / Archaeal Rpo6/eukaryotic RPB6 RNA polymerase subunit / DNA-directed RNA polymerase, 14-18kDa subunit, conserved site / RNA polymerases K / 14 to 18 Kd subunits signature. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain

Component:

DNA-directed RNA polymerases I, II, and III subunit RPABC4 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerase subunit / DNA-directed RNA polymerase II subunit RPB4 / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / DNA-directed RNA polymerase subunit / DNA-directed RNA polymerase II subunit RPB11-a / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerase II subunit RPB3 / DNA-directed RNA polymerase subunit beta / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / Winged helix repair factor 1 / Transcription elongation factor 1 homolog / DNA-directed RNA polymerase II subunit RPB9 / DNA excision repair protein ERCC-6 / DNA excision repair protein ERCC-8 / DNA damage-binding protein 1 / UV-stimulated scaffold protein A / DET1- and DDB1-associated protein 1

• Biological species: Homo sapiens (human) / Sus scrofa domesticus (domestic pig)
• Method: single particle reconstruction / cryo EM / Resolution: 3.4 Å
• Authors: Lee S-H / Sixma TK

Funding support

Netherlands, 2 items

Organization	Grant number	Country
Netherlands Organisation for Scientific Research (NWO)	TOP 714.017.003	Netherlands
Oncode Institute		Netherlands

• Citation: Journal: Mol Cell / Year: 2024; Title: STK19 drives transcription-coupled repair by stimulating repair complex stability, RNA Pol II ubiquitylation, and TFIIH recruitment.; Authors: Anisha R Ramadhin / Shun-Hsiao Lee / Di Zhou / Anita Salmazo / Camila Gonzalo-Hansen / Marjolein van Sluis / Cindy M A Blom / Roel C Janssens / Anja Raams / Dick Dekkers / Karel Bezstarosti / Dea Slade / Wim Vermeulen / Alex Pines / Jeroen A A Demmers / Carrie Bernecky / Titia K Sixma / Jurgen A Marteijn / ; Abstract: Transcription-coupled nucleotide excision repair (TC-NER) efficiently eliminates DNA damage that impedes gene transcription by RNA polymerase II (RNA Pol II). TC-NER is initiated by the recognition of lesion-stalled RNA Pol II by CSB, which recruits the CRL4 ubiquitin ligase and UVSSA. RNA Pol II ubiquitylation at RPB1-K1268 by CRL4 serves as a critical TC-NER checkpoint, governing RNA Pol II stability and initiating DNA damage excision by TFIIH recruitment. However, the precise regulatory mechanisms of CRL4 activity and TFIIH recruitment remain elusive. Here, we reveal human serine/threonine-protein kinase 19 (STK19) as a TC-NER factor, which is essential for correct DNA damage removal and subsequent transcription restart. Cryogenic electron microscopy (cryo-EM) studies demonstrate that STK19 is an integral part of the RNA Pol II-TC-NER complex, bridging CSA, UVSSA, RNA Pol II, and downstream DNA. STK19 stimulates TC-NER complex stability and CRL4 activity, resulting in efficient RNA Pol II ubiquitylation and correct UVSSA and TFIIH binding. These findings underscore the crucial role of STK19 as a core TC-NER component.

History

Deposition	May 16, 2024	-
Header (metadata) release	Nov 13, 2024	-
Map release	Nov 13, 2024	-
Update	Jul 9, 2025	-
Current status	Jul 9, 2025	Processing site: PDBe / Status: Released

Map

• File: Download / File: emd_50325.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
• Annotation: composite map
• Voxel size: X=Y=Z: 1.06 Å

Density

Contour Level	By AUTHOR: 4.4
Minimum - Maximum	-1.6089636 - 114.501975999999999
Average (Standard dev.)	0.029423105 (±1.373137)

• Symmetry: Space group: 1

Details

EMDB XML:

Map geometry	Axis order Z Y X Origin 0 0 0 Dimensions 400 400 400 Spacing 400 400 400
Cell	A=B=C: 423.99997 Å α=β=γ: 90.0 °

Supplemental data

Sample components

Entire : Ternary complex of Pol II-TC-NER-STK19, composite map

• Entire: Name: Ternary complex of Pol II-TC-NER-STK19, composite map

Components

• Complex: Ternary complex of Pol II-TC-NER-STK19, composite map
  • Protein or peptide: DNA-directed RNA polymerase subunit
  • Protein or peptide: DNA-directed RNA polymerase subunit beta
  • Protein or peptide: DNA-directed RNA polymerase II subunit RPB3
  • Protein or peptide: RNA polymerase II subunit D
  • Protein or peptide: DNA-directed RNA polymerase II subunit E
  • Protein or peptide: DNA-directed RNA polymerases I, II, and III subunit RPABC2
  • Protein or peptide: DNA-directed RNA polymerase subunit
  • Protein or peptide: DNA-directed RNA polymerases I, II, and III subunit RPABC3
  • Protein or peptide: DNA-directed RNA polymerase II subunit RPB9
  • Protein or peptide: DNA-directed RNA polymerases I, II, and III subunit RPABC5
  • Protein or peptide: DNA-directed RNA polymerase II subunit RPB11-a
  • Protein or peptide: RNA polymerase II, I and III subunit K
  • Protein or peptide: Transcription elongation factor 1 homolog
  • DNA: Non-template DNA
  • RNA: RNA
  • DNA: Template DNA
  • Protein or peptide: DNA excision repair protein ERCC-8
  • Protein or peptide: DNA damage-binding protein 1
  • Protein or peptide: DET1- and DDB1-associated protein 1
  • Protein or peptide: Inactive serine/threonine-protein kinase 19
  • Protein or peptide: DNA excision repair protein ERCC-6
• Protein or peptide: UV-stimulated scaffold protein A
• Ligand: ZINC ION
• Ligand: MAGNESIUM ION

Supramolecule #1: Ternary complex of Pol II-TC-NER-STK19, composite map

• Supramolecule: Name: Ternary complex of Pol II-TC-NER-STK19, composite map / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#21
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 1.17 MDa

Macromolecule #1: DNA-directed RNA polymerase subunit

• Macromolecule: Name: DNA-directed RNA polymerase subunit / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 217.450078 KDa

Sequence

String:

MHGGGPPSGD SACPLRTIKR VQFGVLSPDE LKRMSVTEGG IKYPETTEGG RPKLGGLMDP RQGVIERTGR CQTCAGNMTE CPGHFGHIE LAKPVFHVGF LVKTMKVLRC VCFFCSKLLV DSNNPKIKDI LAKSKGQPKK RLTHVYDLCK GKNICEGGEE M DNKFGVEQ PEGDEDLTKE KGHGGCGRYQ PRIRRSGLEL YAEWKHVNED SQEKKILLSP ERVHEIFKRI SDEECFVLGM EP RYARPEW MIVTVLPVPP LSVRPAVVMQ GSARNQDDLT HKLADIVKIN NQLRRNEQNG AAAHVIAEDV KLLQFHVATM VDN ELPGLP RAMQKSGRPL KSLKQRLKGK EGRVRGNLMG KRVDFSARTV ITPDPNLSID QVGVPRSIAA NMTFAEIVTP FNID RLQEL VRRGNSQYPG AKYIIRDNGD RIDLRFHPKP SDLHLQTGYK VERHMCDGDI VIFNRQPTLH KMSMMGHRVR ILPWS TFRL NLSVTTPYNA DFDGDEMNLH LPQSLETRAE IQELAMVPRM IVTPQSNRPV MGIVQDTLTA VRKFTKRDVF LERGEV MNL LMFLSTWDGK VPQPAILKPR PLWTGKQIFS LIIPGHINCI RTHSTHPDDE DSGPYKHISP GDTKVVVENG ELIMGIL CK KSLGTSAGSL VHISYLEMGH DITRLFYSNI QTVINNWLLI EGHTIGIGDS IADSKTYQDI QNTIKKAKQD VIEVIEKA H NNELEPTPGN TLRQTFENQV NRILNDARDK TGSSAQKSLS EYNNFKSMVV SGAKGSKINI SQVIAVVGQQ NVEGKRIPF GFKHRTLPHF IKDDYGPESR GFVENSYLAG LTPTEFFFHA MGGREGLIDT AVKTAETGYI QRRLIKSMES VMVKYDATVR NSINQVVQL RYGEDGLAGE SVEFQNLATL KPSNKAFEKK FRFDYTNERA LRRTLQEDLV KDVLSNAHIQ NELEREFERM R EDREVLRV IFPTGDSKVV LPCNLLRMIW NAQKIFHINP RLPSDLHPIK VVEGVKELSK KLVIVNGDDP LSRQAQENAT LL FNIHLRS TLCSRRMAEE FRLSGEAFDW LLGEIESKFN QAIAHPGEMV GALAAQSLGE PATQMTLNTF HYAGVSAKNV TLG VPRLKE LINISKKPKT PSLTVFLLGQ SARDAERAKD ILCRLEHTTL RKVTANTAIY YDPNPQSTVV AEDQEWVNVY YEMP DFDVA RISPWLLRVE LDRKHMTDRK LTMEQIAEKI NAGFGDDLNC IFNDDNAEKL VLRIRIMNSD ENKMQEEEEV VDKMD DDVF LRCIESNMLT DMTLQGIEQI SKVYMHLPQT DNKKKIIITE DGEFKALQEW ILETDGVSLM RVLSEKDVDP VRTTSN DIV EIFTVLGIEA VRKALERELY HVISFDGSYV NYRHLALLCD TMTCRGHLMA ITRHGVNRQD TGPLMKCSFE ETVDVLM EA AAHGESDPMK GVSENIMLGQ LAPAGTGCFD LLLDAEKCKY GMEIPTNIPG LGAAGPTGMF FGSAPSPMGG ISPAMTPW N QGATPAYGAW SPSVGSGMTP GAAGFSPSAA SDASGFSPGY SPAWSPTPGS PGSPGPSSPY IPSPGGAMSP SYSPTSPAY EPRSPGGYTP QSPSYSPTSP SYSPTSPSYS PTSPNYSPTS PSYSPTSPSY SPTSPSYSPT SPSYSPTSPS YSPTSPSYSP TSPSYSPTS PSYSPTSPSY SPTSPSYSPT SPSYSPTSPS YSPTSPSYSP TSPSYSPTSP SYSPTSPNYS PTSPNYTPTS P SYSPTSPS YSPTSPNYTP TSPNYSPTSP SYSPTSPSYS PTSPSYSPSS PRYTPQSPTY TPSSPSYSPS SPSYSPTSPK YT PTSPSYS PSSPEYTPTS PKYSPTSPKY SPTSPKYSPT SPTYSPTTPK YSPTSPTYSP TSPVYTPTSP KYSPTSPTYS PTS PKYSPT SPTYSPTSPK GSTYSPTSPG YSPTSPTYSL TSPAISPDDS DEEN

UniProtKB: DNA-directed RNA polymerase subunit

Macromolecule #2: DNA-directed RNA polymerase subunit beta

• Macromolecule: Name: DNA-directed RNA polymerase subunit beta / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 147.938594 KDa

Sequence

String:

MKPLRPENPP KAELKGLLFV QQHCKTRLHS VAVTRPRGAA TEESTPKLRM CSTNLSQALA YFRAGANLTA ASLWAGFRGS RRIFWERRK RKSLCLALRP GGACWRWLLA VSCVSLRGLG APGSCANMYD ADEDMQYDED DDEITPDLWQ EACWIVISSY F DEKGLVRQ QLDSFDEFIQ MSVQRIVEDA PPIDLQAEAQ HASGEVEEPP RYLLKFEQIY LSKPTHWERD GAPSPMMPNE AR LRNLTYS APLYVDITKT VIKEGEEQLQ TQHQKTFIGK IPIMLRSTYC LLNGLTDRDL CELNECPLDP GGYFIINGSE KVL IAQEKM ATNTVYVFAK KDSKYAYTGE CRSCLENSSR PTSTIWVSML ARGGQGAKKS AIGQRIVATL PYIKQEVPII IVFR ALGFV SDRDILEHII YDFEDPEMME MVKPSLDEAF VIQEQNVALN FIGSRGAKPG VTKEKRIKYA KEVLQKEMLP HVGVS DFCE TKKAYFLGYM VHRLLLAALG RRELDDRDHY GNKRLDLAGP LLAFLFRGMF KNLLKEVRIY AQKFIDRGKD FNLELA IKT RIISDGLKYS LATGNWGDQK KAHQARAGVS QVLNRLTFAS TLSHLRRLNS PIGRDGKLAK PRQLHNTLWG MVCPAET PE GHAVGLVKNL ALMAYISVGS QPSPILEFLE EWSMENLEEI SPAAIADATK IFVNGCWVGI HKDPEQLMNT LRKLRRQM D IIVSEVSMIR DIREREIRIY TDAGRICRPL LIVEKQKLLL KKRHIDQLKE REYNNYSWQD LVASGVVEYI DTLEEETVM LAMTPDDLQE KEVAYCSTYT HCEIHPSMIL GVCASIIPFP DHNQSPRNTY QSAMGKQAMG VYITNFHVRM DTLAHVLYYP QKPLVTTRS MEYLRFRELP AGINSIVAIA SYTGYNQEDS VIMNRSAVDR GFFRSVFYRS YKEQESKKGF DQEEVFEKPT R ETCQGMRH AIYDKLDDDG LIAPGVRVSG DDVIIGKTVT LPENEDELEG TNRRYTKRDC STFLRTSETG IVDQVMVTLN QE GYKFCKI RVRSVRIPQI GDKFASRHGQ KGTCGIQYRQ EDMPFTCEGI TPDIIINPHA IPSRMTIGHL IECLQGKVSA NKG EIGDAT PFNDAVNVQK ISNLLSDYGY HLRGNEVLYN GFTGRKITSQ IFIGPTYYQR LKHMVDDKIH SRARGPIQIL NRQP MEGRS RDGGLRFGEM ERDCQIAHGA AQFLRERLFE ASDPYQVHVC NLCGIMAIAN TRTHTYECRG CRNKTQISLV RMPYA CKLL FQELMSMSIA PRMMSV

UniProtKB: DNA-directed RNA polymerase subunit beta

Macromolecule #3: DNA-directed RNA polymerase II subunit RPB3

• Macromolecule: Name: DNA-directed RNA polymerase II subunit RPB3 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 31.439074 KDa

Sequence

String:

MPYANQPTVR ITELTDENVK FIIENTDLAV ANSIRRVFIA EVPIIAIDWV QIDANSSVLH DEFIAHRLGL IPLTSDDIVD KLQYSRDCT CEEFCPECSV EFTLDVRCNE DQTRHVTSRD LISNSPRVIP VTSRNRDNDP SDYVEQDDIL IVKLRKGQEL R LRAYAKKG FGKEHAKWNP TAGVAFEYDP DNALRHTVYP KPEEWPKSEY SELDEDESQA PYDPNGKPER FYYNVESCGS LR PETIVLS ALSGLKKKLS DLQTQLSHEI QSDVLTIN

UniProtKB: DNA-directed RNA polymerase II subunit RPB3

Macromolecule #4: RNA polymerase II subunit D

• Macromolecule: Name: RNA polymerase II subunit D / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 16.331255 KDa

Sequence

String:

MAAGGSDPRA GDVEEDASQL IFPKEFETAE TLLNSEVHML LEHRKQQNES AEDEQELSEV FMKTLNYTAR FSRFKNRETI ASVRSLLLQ KKLHKFELAC LANLCPETAE ESKALIPSLE GRFEDEELQQ ILDDIQTKRS FQY

UniProtKB: DNA-directed RNA polymerase II subunit RPB4

Macromolecule #5: DNA-directed RNA polymerase II subunit E

• Macromolecule: Name: DNA-directed RNA polymerase II subunit E / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 24.644318 KDa

Sequence

String:

MDDEEETYRL WKIRKTIMQL CHDRGYLVTQ DELDQTLEEF KAQFGDKPSE GRPRRTDLTV LVAHNDDPTD QMFVFFPEEP KVGIKTIKV YCQRMQEENI TRALIVVQQG MTPSAKQSLV DMAPKYILEQ FLQQELLINI TEHELVPEHV VMTKEEVTEL L ARYKLREN QLPRIQAGDP VARYFGIKRG QVVKIIRPSE TAGRYITYRL VQ

UniProtKB: DNA-directed RNA polymerases I, II, and III subunit RPABC1

Macromolecule #6: DNA-directed RNA polymerases I, II, and III subunit RPABC2

• Macromolecule: Name: DNA-directed RNA polymerases I, II, and III subunit RPABC2; type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 14.477001 KDa

Sequence

String:

MSDNEDNFDG DDFDDVEEDE GLDDLENAEE EGQENVEILP SGERPQANQK RITTPYMTKY ERARVLGTRA LQIAMCAPVM VELEGETDP LLIAMKELKA RKIPIIIRRY LPDGSYEDWG VDELIISD

UniProtKB: DNA-directed RNA polymerases I, II, and III subunit RPABC2

Macromolecule #7: DNA-directed RNA polymerase subunit

• Macromolecule: Name: DNA-directed RNA polymerase subunit / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 19.314283 KDa

Sequence

String:

MFYHISLEHE ILLHPRYFGP NLLNTVKQKL FTEVEGTCTG KYGFVIAVTT IDNIGAGVIQ PGRGFVLYPV KYKAIVFRPF KGEVVDAVV TQVNKVGLFT EIGPMSCFIS RHSIPSEMEF DPNSNPPCYK TMDEDIVIQQ DDEIRLKIVG TRVDKNDIFA I GSLMDDYL GLVS

UniProtKB: DNA-directed RNA polymerase subunit

Macromolecule #8: DNA-directed RNA polymerases I, II, and III subunit RPABC3

• Macromolecule: Name: DNA-directed RNA polymerases I, II, and III subunit RPABC3; type: protein_or_peptide / ID: 8 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 17.162273 KDa

Sequence

String:

MAGILFEDIF DVKDIDPEGK KFDRVSRLHC ESESFKMDLI LDVNIQIYPV DLGDKFRLVI ASTLYEDGTL DDGEYNPTDD RPSRADQFE YVMYGKVYRI EGDETSTEAA TRLSAYVSYG GLLMRLQGDA NNLHGFEVDS RVYLLMKKLA F

UniProtKB: DNA-directed RNA polymerases I, II, and III subunit RPABC3

Macromolecule #9: DNA-directed RNA polymerase II subunit RPB9

• Macromolecule: Name: DNA-directed RNA polymerase II subunit RPB9 / type: protein_or_peptide / ID: 9 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 14.541221 KDa

Sequence

String:

MEPDGTYEPG FVGIRFCQEC NNMLYPKEDK ENRILLYACR NCDYQQEADN SCIYVNKITH EVDELTQIIA DVSQDPTLPR TEDHPCQKC GHKEAVFFQS HSARAEDAMR LYYVCTAPHC GHRWTE

UniProtKB: DNA-directed RNA polymerase II subunit RPB9

Macromolecule #10: DNA-directed RNA polymerases I, II, and III subunit RPABC5

• Macromolecule: Name: DNA-directed RNA polymerases I, II, and III subunit RPABC5; type: protein_or_peptide / ID: 10 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 7.655123 KDa

Sequence

String:

MIIPVRCFTC GKIVGNKWEA YLGLLQAEYT EGDALDALGL KRYCCRRMLL AHVDLIEKLL NYAPLEK

UniProtKB: DNA-directed RNA polymerases I, II, and III subunit RPABC5

Macromolecule #11: DNA-directed RNA polymerase II subunit RPB11-a

• Macromolecule: Name: DNA-directed RNA polymerase II subunit RPB11-a / type: protein_or_peptide / ID: 11 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 13.310284 KDa

Sequence

String:

MNAPPAFESF LLFEGEKKIT INKDTKVPNA CLFTINKEDH TLGNIIKSQL LKDPQVLFAG YKVPHPLEHK IIIRVQTTPD YSPQEAFTN AITDLISELS LLEERFRVAI KDKQEGIE

UniProtKB: DNA-directed RNA polymerase II subunit RPB11-a

Macromolecule #12: RNA polymerase II, I and III subunit K

• Macromolecule: Name: RNA polymerase II, I and III subunit K / type: protein_or_peptide / ID: 12 / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Sus scrofa domesticus (domestic pig) / Organ: thymus
• Molecular weight: Theoretical: 7.018244 KDa

Sequence

String:

MDTQKDVQPP KQQPMIYICG ECHTENEIKS RDPIRCRECG YRIMYKKRTK RLVVFDAR

UniProtKB: DNA-directed RNA polymerases I, II, and III subunit RPABC4

Macromolecule #13: Transcription elongation factor 1 homolog

• Macromolecule: Name: Transcription elongation factor 1 homolog / type: protein_or_peptide / ID: 13 ; Details: The first two residues (Gly, Ala) are residual residues after TEV protease treatment. ELOF1 sequence starts from residue 3 (Met).; Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 9.604012 KDa
• Recombinant expression: Organism: Escherichia coli (E. coli)

Sequence

String:

GAMGRRKSKR KPPPKKKMTG TLETQFTCPF CNHEKSCDVK MDRARNTGVI SCTVCLEEFQ TPITYLSEPV DVYSDWIDAC EAANQ

UniProtKB: Transcription elongation factor 1 homolog

Macromolecule #17: DNA excision repair protein ERCC-8

• Macromolecule: Name: DNA excision repair protein ERCC-8 / type: protein_or_peptide / ID: 17 ; Details: The construct contains a Strep tag II at the C-terminus; Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 45.465613 KDa
• Recombinant expression: Organism: Spodoptera frugiperda (fall armyworm)

Sequence

String:

MLGFLSARQT GLEDPLRLRR AESTRRVLGL ELNKDRDVER IHGGGINTLD IEPVEGRYML SGGSDGVIVL YDLENSSRQS YYTCKAVCS IGRDHPDVHR YSVETVQWYP HDTGMFTSSS FDKTLKVWDT NTLQTADVFN FEETVYSHHM SPVSTKHCLV A VGTRGPKV QLCDLKSGSC SHILQGHRQE ILAVSWSPRY DYILATASAD SRVKLWDVRR ASGCLITLDQ HNGKKSQAVE SA NTAHNGK VNGLCFTSDG LHLLTVGTDN RMRLWNSSNG ENTLVNYGKV CNNSKKGLKF TVSCGCSSEF VFVPYGSTIA VYT VYSGEQ ITMLKGHYKT VDCCVFQSNF QELYSGSRDC NILAWVPSLY EPVPDDDETT TKSQLNPAFE DAWSSSDEEG GTSA WSHPQ FEK

UniProtKB: DNA excision repair protein ERCC-8

Macromolecule #18: DNA damage-binding protein 1

• Macromolecule: Name: DNA damage-binding protein 1 / type: protein_or_peptide / ID: 18 / Details: The construct contains a His tag at the N-terminus / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 129.298867 KDa
• Recombinant expression: Organism: Spodoptera frugiperda (fall armyworm)

Sequence

String:

MAHHHHHHSA ALEVLFQGPG MSYNYVVTAQ KPTAVNGCVT GHFTSAEDLN LLIAKNTRLE IYVVTAEGLR PVKEVGMYGK IAVMELFRP KGESKDLLFI LTAKYNACIL EYKQSGESID IITRAHGNVQ DRIGRPSETG IIGIIDPECR MIGLRLYDGL F KVIPLDRD NKELKAFNIR LEELHVIDVK FLYGCQAPTI CFVYQDPQGR HVKTYEVSLR EKEFNKGPWK QENVEAEASM VI AVPEPFG GAIIIGQESI TYHNGDKYLA IAPPIIKQST IVCHNRVDPN GSRYLLGDME GRLFMLLLEK EEQMDGTVTL KDL RVELLG ETSIAECLTY LDNGVVFVGS RLGDSQLVKL NVDSNEQGSY VVAMETFTNL GPIVDMCVVD LERQGQGQLV TCSG AFKEG SLRIIRNGIG IHEHASIDLP GIKGLWPLRS DPNRETDDTL VLSFVGQTRV LMLNGEEVEE TELMGFVDDQ QTFFC GNVA HQQLIQITSA SVRLVSQEPK ALVSEWKEPQ AKNISVASCN SSQVVVAVGR ALYYLQIHPQ ELRQISHTEM EHEVAC LDI TPLGDSNGLS PLCAIGLWTD ISARILKLPS FELLHKEMLG GEIIPRSILM TTFESSHYLL CALGDGALFY FGLNIET GL LSDRKKVTLG TQPTVLRTFR SLSTTNVFAC SDRPTVIYSS NHKLVFSNVN LKEVNYMCPL NSDGYPDSLA LANNSTLT I GTIDEIQKLH IRTVPLYESP RKICYQEVSQ CFGVLSSRIE VQDTSGGTTA LRPSASTQAL SSSVSSSKLF SSSTAPHET SFGEEVEVHN LLIIDQHTFE VLHAHQFLQN EYALSLVSCK LGKDPNTYFI VGTAMVYPEE AEPKQGRIVV FQYSDGKLQT VAEKEVKGA VYSMVEFNGK LLASINSTVR LYEWTTEKEL RTECNHYNNI MALYLKTKGD FILVGDLMRS VLLLAYKPME G NFEEIARD FNPNWMSAVE ILDDDNFLGA ENAFNLFVCQ KDSAATTDEE RQHLQEVGLF HLGEFVNVFC HGSLVMQNLG ET STPTQGS VLFGTVNGMI GLVTSLSESW YNLLLDMQNR LNKVIKSVGK IEHSFWRSFH TERKTEPATG FIDGDLIESF LDI SRPKMQ EVVANLQYDD GSGMKREATA DDLIKVVEEL TRIH

UniProtKB: DNA damage-binding protein 1

Macromolecule #19: DET1- and DDB1-associated protein 1

• Macromolecule: Name: DET1- and DDB1-associated protein 1 / type: protein_or_peptide / ID: 19 ; Details: The construct contains a twin Strep tag and a flag tag at the C-terminus; Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 16.997615 KDa
• Recombinant expression: Organism: Spodoptera frugiperda (fall armyworm)

Sequence

String:

MADFLKGLPV YNKSNFSRFH ADSVCKASNR RPSVYLPTRE YPSEQIIVTE KTNILLRYLH QQWDKKNAAK KRDQEQVELE GESSAPPRK VARTDSPDMH EDTDVLFQGP GAWSHPQFEK GGGSGGGSGG GSWSHPQFEK GASGEDYKDD DDK

UniProtKB: DET1- and DDB1-associated protein 1

Macromolecule #20: Inactive serine/threonine-protein kinase 19

• Macromolecule: Name: Inactive serine/threonine-protein kinase 19 / type: protein_or_peptide / ID: 20 ; Details: The first three residues (Gly, Pro, Gly) are residual residues after 3C protease treatment. The coding sequence of STK19 starts from residue 4 (Met).; Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 28.717211 KDa
• Recombinant expression: Organism: Escherichia coli (E. coli)

Sequence

String:

GPGMSWKRHH LIPETFGVKR RRKRGPVESD PLRGEPGSAR AAVSELMQLF PRGLFEDALP PIVLRSQVYS LVPDRTVADR QLKELQEQG EIRIVQLGFD LDAHGIIFTE DYRTRVLKAC DGRPYAGAVQ KFLASVLPAC GDLSFQQDQM TQTFGFRDSE I THLVNAGV LTVRDAGSWW LAVPGAGRFI KYFVKGRQAV LSMVRKAKYR ELLLSELLGR RAPVVVRLGL TYHVHDLIGA QL VDCISTT SGTLLRLPET

UniProtKB: Winged helix repair factor 1

Macromolecule #21: DNA excision repair protein ERCC-6

• Macromolecule: Name: DNA excision repair protein ERCC-6 / type: protein_or_peptide / ID: 21 ; Details: The construct contains a N-terminal HA tag and a C-terminal His tag; Number of copies: 1 / Enantiomer: LEVO; EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 168.673547 KDa
• Recombinant expression: Organism: Spodoptera frugiperda (fall armyworm)

Sequence

String:

MPNEGIPHSS QTQEQDCLQS QPVSNNEEMA IKQESGGDGE VEEYLSFRSV GDGLSTSAVG CASAAPRRGP ALLHIDRHQI QAVEPSAQA LELQGLGVDV YDQDVLEQGV LQQVDNAIHE ASRASQLVDV EKEYRSVLDD LTSCTTSLRQ INKIIEQLSP Q AATSRDIN RKLDSVKRQK YNKEQQLKKI TAKQKHLQAI LGGAEVKIEL DHASLEEDAE PGPSSLGSML MPVQETAWEE LI RTGQMTP FGTQIPQKQE KKPRKIMLNE ASGFEKYLAD QAKLSFERKK QGCNKRAARK APAPVTPPAP VQNKNKPNKK ARV LSKKEE RLKKHIKKLQ KRALQFQGKV GLPKARRPWE SDMRPEAEGD SEGEESEYFP TEEEEEEEDD EVEGAEADLS GDGT DYELK PLPKGGKRQK KVPVQEIDDD FFPSSGEEAE AASVGEGGGG GRKVGRYRDD GDEDYYKQRL RRWNKLRLQD KEKRL KLED DSEESDAEFD EGFKVPGFLF KKLFKYQQTG VRWLWELHCQ QAGGILGDEM GLGKTIQIIA FLAGLSYSKI RTRGSN YRF EGLGPTVIVC PTTVMHQWVK EFHTWWPPFR VAILHETGSY THKKEKLIRD VAHCHGILIT SYSYIRLMQD DISRYDW HY VILDEGHKIR NPNAAVTLAC KQFRTPHRII LSGSPMQNNL RELWSLFDFI FPGKLGTLPV FMEQFSVPIT MGGYSNAS P VQVKTAYKCA CVLRDTINPY LLRRMKSDVK MSLSLPDKNE QVLFCRLTDE QHKVYQNFVD SKEVYRILNG EMQIFSGLI ALRKICNHPD LFSGGPKNLK GLPDDELEED QFGYWKRSGK MIVVESLLKI WHKQGQRVLL FSQSRQMLDI LEVFLRAQKY TYLKMDGTT TIASRQPLIT RYNEDTSIFV FLLTTRVGGL GVNLTGANRV VIYDPDWNPS TDTQARERAW RIGQKKQVTV Y RLLTAGTI EEKIYHRQIF KQFLTNRVLK DPKQRRFFKS NDLYELFTLT SPDASQSTET SAIFAGTGSD VQTPKCHLKR RI QPAFGAD HDVPKRKKFP ASNISVNDAT SSEEKSEAKG AEVNAVTSNR SDPLKDDPHM SSNVTSNDRL GEETNAVSGP EEL SVISGN GECSNSSGTG KTSMPSGDES IDEKLGLSYK RERPSQAQTE AFWENKQMEN NFYKHKSKTK HHSVAEEETL EKHL RPKQK PKNSKHCRDA KFEGTRIPHL VKKRRYQKQD SENKSEAKEQ SNDDYVLEKL FKKSVGVHSV MKHDAIMDGA SPDYV LVEA EANRVAQDAL KALRLSRQRC LGAVSGVPTW TGHRGISGAP AGKKSRFGKK RNSNFSVQHP SSTSPTEKCQ DGIMKK EGK DNVPEHFSGR AEDADSSSGP LASSSLLAKM RARNHLILPE RLESESGHLQ EASALLPTTE HDDLLVEMRN FIAFQAH TD GQASTREILQ EFESKLSASQ SCVFRELLRN LCTFHRTSGG EGIWKLKPEY C

UniProtKB: DNA excision repair protein ERCC-6

Macromolecule #22: UV-stimulated scaffold protein A

• Macromolecule: Name: UV-stimulated scaffold protein A / type: protein_or_peptide / ID: 22 / Details: The construct contains a His tag at the N-terminus / Number of copies: 1 / Enantiomer: LEVO
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 82.923164 KDa
• Recombinant expression: Organism: Spodoptera frugiperda (fall armyworm)

Sequence

String:

MAHHHHHHSA ALEVLFQGPG MDQKLSKLVE ELTTSGEPRL NPEKMKELKK ICKSSEEQLS RAYRLLIAQL TQEHAEIRLS AFQIVEELF VRSHQFRMLV VSNFQEFLEL TLGTDPAQPL PPPREAAQRL RQATTRAVEG WNEKFGEAYK KLALGYHFLR H NKKVDFQD TNARSLAERK REEEKQKHLD KIYQERASQA EREMQEMSGE IESCLTEVES CFRLLVPFDF DPNPETESLG MA SGMSDAL RSSCAGQVGP CRSGTPDPRD GEQPCCSRDL PASAGHPRAG GGAQPSQTAT GDPSDEDEDS DLEEFVRSHG LGS HKYTLD VELCSEGLKV QENEDNLALI HAARDTLKLI RNKFLPAVCS WIQRFTRVGT HGGCLKRAID LKAELELVLR KYKE LDIEP EGGERRRTEA LGDAEEDEDD EDFVEVPEKE GYEPHIPDHL RPEYGLEAAP EKDTVVRCLR TRTRMDEEVS DPTSA AAQL RQLRDHLPPP SSASPSRALP EPQEAQKLAA ERARAPVVPY GVDLHYWGQE LPTAGKIVKS DSQHRFWKPS EVEEEV VNA DISEMLRSRH ITFAGKFEPV QHWCRAPRPD GRLCERQDRL KCPFHGKIVP RDDEGRPLDP EDRAREQRRQ LQKQERP EW QDPELMRDVE AATGQDLGSS RYSGKGRGKK RRYPSLTNLK AQADTARARI GRKVFAKAAV RRVVAAMNRM DQKKHEKF S NQFNYALN

UniProtKB: UV-stimulated scaffold protein A

Macromolecule #14: Non-template DNA

• Macromolecule: Name: Non-template DNA / type: dna / ID: 14 / Number of copies: 1 / Classification: DNA
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 18.496854 KDa

Sequence

String:

(DC)(DT)(DA)(DG)(DT)(DT)(DG)(DA)(DT)(DC) (DT)(DC)(DA)(DT)(DA)(DT)(DT)(DT)(DC)(DA) (DT)(DT)(DC)(DC)(DT)(DA)(DC)(DT)(DC) (DA)(DG)(DG)(DA)(DG)(DA)(DA)(DG)(DG)(DA) (DG) (DC)(DA)(DG)(DA)(DG)(DC)(DG)(DC) (DT)(DT)(DG)(DA)(DG)(DC)(DT)(DT)(DG)(DA) (DT)(DC)

Macromolecule #16: Template DNA

• Macromolecule: Name: Template DNA / type: dna / ID: 16 / Number of copies: 1 / Classification: DNA
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 18.298717 KDa

Sequence

String:

(DG)(DA)(DT)(DC)(DA)(DA)(DG)(DC)(DT)(DC) (DA)(DA)(DG)(DC)(DG)(DC)(DT)(DC)(DT)(DG) (DC)(DT)(DC)(DC)(DT)(DT)(DC)(DT)(DC) (DC)(DC)(DA)(DT)(DC)(DC)(DT)(DC)(DT)(DC) (DG) (DA)(DT)(DG)(DG)(DC)(DT)(DA)(DT) (DG)(DA)(DG)(DA)(DT)(DC)(DA)(DA)(DC)(DT) (DA)(DG)

Macromolecule #15: RNA

• Macromolecule: Name: RNA / type: rna / ID: 15 / Number of copies: 1
• Source (natural): Organism: Homo sapiens (human)
• Molecular weight: Theoretical: 8.10194 KDa

Sequence

String:

GAAUAUAUAU ACAAAAUCGA GAGGA

Macromolecule #23: ZINC ION

• Macromolecule: Name: ZINC ION / type: ligand / ID: 23 / Number of copies: 10 / Formula: ZN
• Molecular weight: Theoretical: 65.409 Da

Macromolecule #24: MAGNESIUM ION

• Macromolecule: Name: MAGNESIUM ION / type: ligand / ID: 24 / Number of copies: 1 / Formula: MG
• Molecular weight: Theoretical: 24.305 Da

Experimental details

Structure determination

• Method: cryo EM
• Processing: single particle reconstruction
• Aggregation state: particle

Sample preparation

• Concentration: 0.15 mg/mL

Buffer

pH: 7.5
Component:

Concentration	Formula	Name
20.0 mM	HEPES	HEPES
100.0 mM	NaCl	sodium chloride
2.0 mM	MgCl2	magnesium chloride
10.0 uM	ZnSO4	zinc sulfate
1.0 mM	TCEP	tris(2-carboxyethyl)phosphine

• Grid: Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY
• Vitrification: Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
• Details: The final concentration of Pol II is around 0.15 mg/ml. The other components were added in different molar ratio. This sample was glutaraldehyde crosslinked.

Electron microscopy

• Microscope: FEI TITAN KRIOS
• Specialist optics: Energy filter - Slit width: 20 eV
• Details: Collected on Krios 1 at Netherlands Center for Electron Nanoscopy (NeCEN)
• Image recording: Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 2 / Number real images: 13029 / Average exposure time: 3.43 sec. / Average electron dose: 50.0 e/Ų; Details: Two datasets were collected from the same sample using the same parameters.
• Electron beam: Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
• Electron optics: C2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 81000
• Sample stage: Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
• Experimental equipment: Model: Titan Krios / Image courtesy: FEI Company

Image processing

• Particle selection: Number selected: 2866913 / Details: Particles were combined from two datasets.
• CTF correction: Software - Name: cryoSPARC / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
• Startup model: Type of model: OTHER
• Final reconstruction: Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: OTHER / Software - Name: cryoSPARC; Details: Each focused map was reconstructed using different number of particles.; Number images used: 257539
• Initial angle assignment: Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
• Final angle assignment: Type: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC