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- EMDB-29732: Cryo-EM consensus structure of Escherichia coli que-PEC (paused e... -

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Entry
Database: EMDB / ID: EMD-29732
TitleCryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand
Map data
Sample
  • Complex: Cryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand
    • DNA: DNA (39-mer)
    • DNA: DNA (31-MER)
    • Protein or peptide: DNA-directed RNA polymerase subunit alphaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit omegaPolymerase
    • RNA: RNA (47-MER)
    • Protein or peptide: DNA-directed RNA polymerase subunit betaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'Polymerase
  • Ligand: 7-DEAZA-7-AMINOMETHYL-GUANINE
  • Ligand: MAGNESIUM ION
KeywordsRNA Polymerase / Riboswitch / Transcription / preQ1
Function / homology
Function and homology information


DNA-directed RNA polymerase complex / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / cytoplasm
Similarity search - Function
DNA-directed RNA polymerase, omega subunit / DNA-directed RNA polymerase, subunit beta-prime, bacterial type / DNA-directed RNA polymerase, beta subunit, external 1 domain superfamily / DNA-directed RNA polymerase, beta subunit, external 1 domain / RNA polymerase beta subunit external 1 domain / RNA polymerase, alpha subunit, C-terminal / Bacterial RNA polymerase, alpha chain C terminal domain / DNA-directed RNA polymerase, alpha subunit / DNA-directed RNA polymerase beta subunit, bacterial-type / RNA polymerase Rpb6 ...DNA-directed RNA polymerase, omega subunit / DNA-directed RNA polymerase, subunit beta-prime, bacterial type / DNA-directed RNA polymerase, beta subunit, external 1 domain superfamily / DNA-directed RNA polymerase, beta subunit, external 1 domain / RNA polymerase beta subunit external 1 domain / RNA polymerase, alpha subunit, C-terminal / Bacterial RNA polymerase, alpha chain C terminal domain / DNA-directed RNA polymerase, alpha subunit / DNA-directed RNA polymerase beta subunit, bacterial-type / RNA polymerase Rpb6 / RNA polymerase, subunit omega/Rpo6/RPB6 / RNA polymerase Rpb6 / RNA polymerase Rpb1, domain 3 superfamily / RNA polymerase Rpb1, clamp domain superfamily / RPB6/omega subunit-like superfamily / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 4 / RNA polymerase, N-terminal / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase I subunit A N-terminus / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 5 / RNA polymerase, beta subunit, protrusion / RNA polymerase beta subunit / DNA-directed RNA polymerase, insert domain / DNA-directed RNA polymerase, RpoA/D/Rpb3-type / RNA polymerase Rpb3/RpoA insert domain / RNA polymerase Rpb3/Rpb11 dimerisation domain / RNA polymerases D / DNA-directed RNA polymerase, insert domain superfamily / RNA polymerase, RBP11-like subunit / RNA polymerase Rpb2, domain 2 / RNA polymerase Rpb2, domain 2 / RNA polymerase, beta subunit, conserved site / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerase Rpb2, OB-fold / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerases beta chain signature. / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain / DNA-directed RNA polymerase, subunit 2 / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily / RNA polymerase Rpb2, domain 6
Similarity search - Domain/homology
DNA-directed RNA polymerase subunit alpha / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit beta
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsPorta JC / Chauvier A / Deb I / Ellinger E / Frank AT / Meze K / Ohi MD / Walter NG
Funding support United States, 4 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM131922 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM118524 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)S10OD020011 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)S10OD030275 United States
CitationJournal: Nat Struct Mol Biol / Year: 2023
Title: Structural basis for control of bacterial RNA polymerase pausing by a riboswitch and its ligand.
Authors: Adrien Chauvier / Jason C Porta / Indrajit Deb / Emily Ellinger / Katarina Meze / Aaron T Frank / Melanie D Ohi / Nils G Walter /
Abstract: Folding of nascent transcripts can be modulated by the RNA polymerase (RNAP) that carries out their transcription, and vice versa. A pause of RNAP during transcription of a preQ riboswitch (termed ...Folding of nascent transcripts can be modulated by the RNA polymerase (RNAP) that carries out their transcription, and vice versa. A pause of RNAP during transcription of a preQ riboswitch (termed que-PEC) is stabilized by a previously characterized template consensus sequence and the ligand-free conformation of the nascent RNA. Ligand binding to the riboswitch induces RNAP pause release and downstream transcription termination; however, the mechanism by which riboswitch folding modulates pausing is unclear. Here, we report single-particle cryo-electron microscopy reconstructions of que-PEC in ligand-free and ligand-bound states. In the absence of preQ, the RNA transcript is in an unexpected hyper-translocated state, preventing downstream nucleotide incorporation. Strikingly, on ligand binding, the riboswitch rotates around its helical axis, expanding the surrounding RNAP exit channel and repositioning the transcript for elongation. Our study reveals the tight coupling by which nascent RNA structures and their ligands can functionally regulate the macromolecular transcription machinery.
History
DepositionFeb 10, 2023-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateJul 26, 2023-
Current statusJul 26, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_29732.png

Downloads & links

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Map

FileDownload / File: emd_29732.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.4
Minimum - Maximum-0.5408175 - 1.1354598
Average (Standard dev.)0.002267316 (±0.046837088)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 300.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_29732_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_29732_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM consensus structure of Escherichia coli que-PEC (paused e...

EntireName: Cryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand
Components
  • Complex: Cryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand
    • DNA: DNA (39-mer)
    • DNA: DNA (31-MER)
    • Protein or peptide: DNA-directed RNA polymerase subunit alphaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit omegaPolymerase
    • RNA: RNA (47-MER)
    • Protein or peptide: DNA-directed RNA polymerase subunit betaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'Polymerase
  • Ligand: 7-DEAZA-7-AMINOMETHYL-GUANINE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Cryo-EM consensus structure of Escherichia coli que-PEC (paused e...

SupramoleculeName: Cryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 420 KDa

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Macromolecule #1: DNA (39-mer)

MacromoleculeName: DNA (39-mer) / type: dna / ID: 1 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 12.063754 KDa
SequenceString:
(DG)(DG)(DT)(DC)(DA)(DG)(DT)(DA)(DC)(DG) (DT)(DC)(DC)(DA)(DT)(DT)(DA)(DG)(DC)(DT) (DC)(DT)(DT)(DC)(DG)(DG)(DA)(DA)(DG) (DA)(DG)(DA)(DT)(DT)(DC)(DA)(DG)(DA)(DG)

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Macromolecule #2: DNA (31-MER)

MacromoleculeName: DNA (31-MER) / type: dna / ID: 2 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 9.486079 KDa
SequenceString:
(DC)(DT)(DC)(DT)(DG)(DA)(DA)(DT)(DC)(DT) (DC)(DT)(DT)(DC)(DC)(DT)(DC)(DG)(DT)(DG) (DT)(DG)(DG)(DT)(DC)(DA)(DG)(DG)(DA) (DC)(DG)

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Macromolecule #3: DNA-directed RNA polymerase subunit alpha

MacromoleculeName: DNA-directed RNA polymerase subunit alpha / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 25.971531 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MQGSVTEFLK PRLVDIEQVS STHAKVTLEP LERGFGHTLG NALRRILLSS MPGCAVTEVE IDGVLHEYST KEGVQEDILE ILLNLKGLA VRVQGKDEVI LTLNKSGIGP VTAADITHDG DVEIVKPQHV ICHLTDENAS ISMRIKVQRG RGYVPASTRI H SEEDERPI ...String:
MQGSVTEFLK PRLVDIEQVS STHAKVTLEP LERGFGHTLG NALRRILLSS MPGCAVTEVE IDGVLHEYST KEGVQEDILE ILLNLKGLA VRVQGKDEVI LTLNKSGIGP VTAADITHDG DVEIVKPQHV ICHLTDENAS ISMRIKVQRG RGYVPASTRI H SEEDERPI GRLLVDACYS PVERIAYNVE AARVEQRTDL DKLVIEMETN GTIDPEEAIR RAATILAEQL EAFVDLE

UniProtKB: DNA-directed RNA polymerase subunit alpha

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Macromolecule #4: DNA-directed RNA polymerase subunit omega

MacromoleculeName: DNA-directed RNA polymerase subunit omega / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 8.963044 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
ARVTVQDAVE KIGNRFDLVL VAARRARQMQ VGGKDPLVPE ENDKTTVIAL REIEEGLINN QILDVRERQE QQEQEAAEL

UniProtKB: DNA-directed RNA polymerase subunit omega

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Macromolecule #6: DNA-directed RNA polymerase subunit beta

MacromoleculeName: DNA-directed RNA polymerase subunit beta / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 150.560562 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: VYSYTEKKRI RKDFGKRPQV LDVPYLLSIQ LDSFQKFIEQ DPEGQYGLEA AFRSVFPIQS YSGNSELQYV SYRLGEPVFD VQECQIRGV TYSAPLRVKL RLVIYEREAP EGTVKDIKEQ EVYMGEIPLM TDNGTFVING TERVIVSQLH RSPGVFFDSD K GKTHSSGK ...String:
VYSYTEKKRI RKDFGKRPQV LDVPYLLSIQ LDSFQKFIEQ DPEGQYGLEA AFRSVFPIQS YSGNSELQYV SYRLGEPVFD VQECQIRGV TYSAPLRVKL RLVIYEREAP EGTVKDIKEQ EVYMGEIPLM TDNGTFVING TERVIVSQLH RSPGVFFDSD K GKTHSSGK VLYNARIIPY RGSWLDFEFD PKDNLFVRID RRRKLPATII LRALNYTTEQ ILDLFFEKVI FEIRDNKLQM EL VPERLRG ETASFDIEAN GKVYVEKGRR ITARHIRQLE KDDVKLIEVP VEYIAGKVVA KDYIDESTGE LICAANMELS LDL LAKLSQ SGHKRIETLF TNDLDHGPYI SETLRVDPTN DRLSALVEIY RMMRPGEPPT REAAESLFEN LFFSEDRYDL SAVG RMKFN RSLLREEIEG SGILSKDDII DVMKKLIDIR NGKGEVDDID HLGNRRIRSV GEMAENQFRV GLVRVERAVK ERLSL GDLD TLMPQDMINA KPISAAVKEF FGSSQLSQFM DQNNPLSEIT HKRRISALGP GGLTRERAGF EVRDVHPTHY GRVCPI ETP EGPNIGLINS LSVYAQTNEY GFLETPYRKV TDGVVTDEIH YLSAIEEGNY VIAQANSNLD EEGHFVEDLV TCRSKGE SS LFSRDQVDYM DVSTQQVVSV GASLIPFLEH DDANRALMGA NMQRQAVPTL RADKPLVGTG MERAVAVDSG VTAVAKRG G VVQYVDASRI VIKVNEDEMY PGEAGIDIYN LTKYTRSNQN TCINQMPCVS LGEPVERGDV LADGPSTDLG ELALGQNMR VAFMPWNGYN FEDSILVSER VVQEDRFTTI HIQELACVSR DTKLGPEEIT ADIPNVGEAA LSKLDESGIV YIGAEVTGGD ILVGKVTPK GETQLTPEEK LLRAIFGEKA SDVKDSSLRV PNGVSGTVID VQVFTRDGVE KDKRALEIEE MQLKQAKKDL S EELQILEA GLFSRIRAVL VAGGVEAEKL DKLPRDRWLE LGLTDEEKQN QLEQLAEQYD ELKHEFEKKL EAKRRKITQG DD LAPGVLK IVKVYLAVKR RIQPGDKMAG RHGNKGVISK INPIEDMPYD ENGTPVDIVL NPLGVPSRMN IGQILETHLG MAA KGIGDK INAMLKQQQE VAKLREFIQR AYDLGADVRQ KVDLSTFSDE EVMRLAENLR KGMPIATPVF DGAKEAEIKE LLKL GDLPT SGQIRLYDGR TGEQFERPVT VGYMYMLKLN HLVDDKMHAR STGSYSLVTQ QPLGGKAQFG GQRFGEMEVW ALEAY GAAY TLQEMLTVKS DDVNGRTKMY KNIVDGNHQM EPGMPESFNV LLKEIRSLGI NIELED

UniProtKB: DNA-directed RNA polymerase subunit beta

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Macromolecule #7: DNA-directed RNA polymerase subunit beta'

MacromoleculeName: DNA-directed RNA polymerase subunit beta' / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 150.436344 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: EFDAIKIALA SPDMIRSWSF GEVKKPETIN YRTFKPERDG LFCARIFGPV KDYECLCGKY KRLKHRGVIC EKCGVEVTQT KVRRERMGH IELASPTAHI WFLKSLPSRI GLLLDMPLRD IERVLYFESY VVIEGGMTNL ERQQILTEEQ YLDALEEFGD E FDAKMGAE ...String:
EFDAIKIALA SPDMIRSWSF GEVKKPETIN YRTFKPERDG LFCARIFGPV KDYECLCGKY KRLKHRGVIC EKCGVEVTQT KVRRERMGH IELASPTAHI WFLKSLPSRI GLLLDMPLRD IERVLYFESY VVIEGGMTNL ERQQILTEEQ YLDALEEFGD E FDAKMGAE AIQALLKSMD LEQECEQLRE ELNETNSETK RKKLTKRIKL LEAFVQSGNK PEWMILTVLP VLPPDLRPLV PL DGGRFAT SDLNDLYRRV INRNNRLKRL LDLAAPDIIV RNEKRMLQEA VDALLDNGRR GRAITGSNKR PLKSLADMIK GKQ GRFRQN LLGKRVDYSG RSVITVGPYL RLHQCGLPKK MALELFKPFI YGKLELRGLA TTIKAAKKMV EREEAVVWDI LDEV IREHP VLLNRAPTLH RLGIQAFEPV LIEGKAIQLH PLVCAAYNAD FDGDQMAVHV PLTLEAQLEA RALMMSTNNI LSPAN GEPI IVPSQDVVLG LYYMTRDCVN AKGEGMVLTG PKEAERLYRS GLASLHARVK VRITEYEKDA NGELVAKTSL KDTTVG RAI LWMIVPKGLP YSIVNQALGK KAISKMLNTC YRILGLKPTV IFADQIMYTG FAYAARSGAS VGIDDMVIPE KKHEIIS EA EAEVAEIQEQ FQSGLVTAGE RYNKVIDIWA AANDRVSKAM MDNLQTETVI NRDGQEEKQV SFNSIYMMAD SGARGSAA Q IRQLAGMRGL MAKPDGSIIE TPITANFREG LNVLQYFIST HGARKGLADT ALKTANSGYL TRRLVDVAQD LVVTEDDCG THEGIMMTPV IEGGDVKEPL RDRVLGRVTA EDVLKPGTAD ILVPRNTLLH EQWCDLLEEN SVDAVKVRSV VSCDTDFGVC AHCYGRDLA RGHIINKGEA IGVIAAQSIG EPGTQLTMRT FHIGGAASRA AAESSIQVKN KGSIKLSNVK SVVNSSGKLV I TSRNTELK LIDEFGRTKE SYKVPYGAVL AKGDGEQVAG GETVANWDPH TMPVITEVSG FVRFTDMIDG QTITRQTDEL TG LSSLVVL DSAERTAGGK DLRPALKIVD AQGNDVLIPG TDMPAQYFLP GKAIVQLEDG VQISSGDTLA RIPQESGGTK DIT GGLPRV ADLFEARRPK EPAILAEISG IVSFGKETKG KRRLVITPVD GSDPYEEMIP KWRQLNVFEG ERVERGDVIS DGPE APHDI LRLRGVHAVT RYIVNEVQDV YRLQGVKIND KHIEVIVRQM LRKATIVNAG SSDFLEGEQV EYSRVKIANR ELEAN GKVG ATYSRDLLGI TKASLATESF ISAASFQETT RVLTEAAVAG KRDELRGLKE NVIVGRLIPA GTGYAYHQDR MRRR

UniProtKB: DNA-directed RNA polymerase subunit beta'

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Macromolecule #5: RNA (47-MER)

MacromoleculeName: RNA (47-MER) / type: rna / ID: 5 / Number of copies: 1
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 15.059079 KDa
SequenceString:
GCAGAGGUUC UAGCUACACC CUCUAUAAAA AACUAAGGAC CACACGA

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Macromolecule #8: 7-DEAZA-7-AMINOMETHYL-GUANINE

MacromoleculeName: 7-DEAZA-7-AMINOMETHYL-GUANINE / type: ligand / ID: 8 / Number of copies: 1 / Formula: PRF
Molecular weightTheoretical: 179.179 Da
Chemical component information

ChemComp-PRF:
7-DEAZA-7-AMINOMETHYL-GUANINE

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Macromolecule #9: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 9 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration5.00 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
50.0 mg/mLC4H11NO3TRIS-HCLTris
100.0 mMKClPotassium Chloride
1.0 mMMgCl2Magnesium chloride
GridModel: C-flat-1.2/1.3 / Material: GOLD / Mesh: 400 / Support film - Material: GOLD / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE
Details: VITRIFICATION WAS CARRIED OUT IN A CHAMBER WITH THE TEMPERATURE SET TO 4 DEGREES CELSIUS..

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 0.5 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Digitization - Dimensions - Width: 1 pixel / Digitization - Dimensions - Height: 1 pixel / Average electron dose: 62.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 122526
Startup modelType of model: NONE / Details: Ab initio
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 51824
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

6asx


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: Cross-correlation coefficient
Output model

PDB-8g4w:
Cryo-EM consensus structure of Escherichia coli que-PEC (paused elongation complex) RNA Polymerase plus preQ1 ligand

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