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- PDB-8f1i: SigN RNA polymerase early-melted intermediate bound to mismatch f... -

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Basic information

Entry
Database: PDB / ID: 8f1i
TitleSigN RNA polymerase early-melted intermediate bound to mismatch fragment dhsU36mm1 (-12T)
Components
  • (DNA (36-MER)) x 2
  • (DNA-directed RNA polymerase subunit ...) x 4
  • RNA polymerase sigma-54 factor
KeywordsTRANSCRIPTION/DNA / promoter-bound / initiation / DNA melting / transcription bubble nucleation / TRANSCRIPTION / TRANSCRIPTION-DNA complex
Function / homology
Function and homology information


arginine metabolic process / DNA-binding transcription activator activity / RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / regulation of DNA-templated transcription initiation / sigma factor activity / bacterial-type flagellum assembly / bacterial-type RNA polymerase core enzyme binding / cytosolic DNA-directed RNA polymerase complex ...arginine metabolic process / DNA-binding transcription activator activity / RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / regulation of DNA-templated transcription initiation / sigma factor activity / bacterial-type flagellum assembly / bacterial-type RNA polymerase core enzyme binding / cytosolic DNA-directed RNA polymerase complex / bacterial-type flagellum-dependent cell motility / nitrate assimilation / nucleotidyltransferase activity / regulation of DNA-templated transcription elongation / transcription elongation factor complex / transcription antitermination / cell motility / DNA-templated transcription initiation / protein-DNA complex / ribonucleoside binding / DNA-directed RNA polymerase / DNA-directed RNA polymerase activity / response to heat / protein-containing complex assembly / intracellular iron ion homeostasis / transcription cis-regulatory region binding / protein dimerization activity / response to antibiotic / regulation of DNA-templated transcription / positive regulation of DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / membrane / cytoplasm / cytosol
Similarity search - Function
Sigma-54 factors family signature 1. / RNA polymerase sigma factor 54, core-binding domain / RNA polymerase sigma factor 54, DNA-binding / RNA polymerase sigma-54 factor, core-binding domain superfamily / Sigma-54 factor, Activator interacting domain (AID) / Sigma-54, DNA binding domain / Sigma-54 factor, core binding domain / Sigma-54 factors family signature 2. / Sigma-54 factors family profile. / RNA polymerase sigma factor 54 ...Sigma-54 factors family signature 1. / RNA polymerase sigma factor 54, core-binding domain / RNA polymerase sigma factor 54, DNA-binding / RNA polymerase sigma-54 factor, core-binding domain superfamily / Sigma-54 factor, Activator interacting domain (AID) / Sigma-54, DNA binding domain / Sigma-54 factor, core binding domain / Sigma-54 factors family signature 2. / Sigma-54 factors family profile. / RNA polymerase sigma factor 54 / RNA polymerase II, Rpb2 subunit, wall domain / RNA polymerase Rpb1 funnel domain / Topoisomerase I; Chain A, domain 4 / DNA-directed RNA polymerase, insert domain / RNA Polymerase Alpha Subunit; Chain A, domain 2 / 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 beta subunit, bacterial-type / DNA-directed RNA polymerase, alpha subunit / Beta Complex / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb6 / RNA polymerase, subunit omega/Rpo6/RPB6 / RNA polymerase Rpb6 / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 3 superfamily / RPB6/omega subunit-like superfamily / 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 / 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, beta subunit, protrusion / RNA polymerase beta subunit / 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 / DNA-directed RNA polymerase, insert domain superfamily / RNA polymerase, N-terminal / RNA polymerase Rpb2, domain 2 / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase Rpb2, domain 2 / RNA polymerase I subunit A N-terminus / RNA polymerase, RBP11-like subunit / 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 / OB fold (Dihydrolipoamide Acetyltransferase, E2P) / Beta Barrel / Orthogonal Bundle / Mainly Beta / Mainly Alpha
Similarity search - Domain/homology
: / DNA / DNA (> 10) / DNA-directed RNA polymerase subunit alpha / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit beta / RNA polymerase sigma-54 factor
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Aquifex aeolicus (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsMueller, A.U. / Chen, J. / Darst, S.A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM118130 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2023
Title: A general mechanism for transcription bubble nucleation in bacteria.
Authors: Andreas U Mueller / James Chen / Mengyu Wu / Courtney Chiu / B Tracy Nixon / Elizabeth A Campbell / Seth A Darst /
Abstract: Bacterial transcription initiation requires σ factors for nucleation of the transcription bubble. The canonical housekeeping σ factor, σ, nucleates DNA melting via recognition of conserved bases ...Bacterial transcription initiation requires σ factors for nucleation of the transcription bubble. The canonical housekeeping σ factor, σ, nucleates DNA melting via recognition of conserved bases of the promoter -10 motif, which are unstacked and captured in pockets of σ. By contrast, the mechanism of transcription bubble nucleation and formation during the unrelated σ-mediated transcription initiation is poorly understood. Herein, we combine structural and biochemical approaches to establish that σ, like σ, captures a flipped, unstacked base in a pocket formed between its N-terminal region I (RI) and extra-long helix features. Strikingly, RI inserts into the nascent bubble to stabilize the nucleated bubble prior to engagement of the obligate ATPase activator. Our data suggest a general paradigm of transcription initiation that requires σ factors to nucleate an early melted intermediate prior to productive RNA synthesis.
History
DepositionNov 5, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 5, 2023Provider: repository / Type: Initial release
Revision 1.1Jun 19, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: DNA (36-MER)
C: DNA (36-MER)
G: DNA-directed RNA polymerase subunit alpha
H: DNA-directed RNA polymerase subunit alpha
I: DNA-directed RNA polymerase subunit beta
J: DNA-directed RNA polymerase subunit beta'
K: DNA-directed RNA polymerase subunit omega
M: RNA polymerase sigma-54 factor
B: DNA (36-MER)
D: DNA (36-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)491,08813
Polymers490,93310
Non-polymers1553
Water1448
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, native gel electrophoresis, gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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DNA chain , 2 types, 4 molecules ACBD

#1: DNA chain DNA (36-MER)


Mass: 11071.182 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) Aquifex aeolicus (bacteria) / References: GenBank: AE000657.1
#7: DNA chain DNA (36-MER)


Mass: 11045.092 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) Aquifex aeolicus (bacteria) / References: GenBank: AE000657.1

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DNA-directed RNA polymerase subunit ... , 4 types, 5 molecules GHIJK

#2: Protein DNA-directed RNA polymerase subunit alpha / RNAP subunit alpha / RNA polymerase subunit alpha / Transcriptase subunit alpha


Mass: 36558.680 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpoA, pez, phs, sez, b3295, JW3257 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A7Z4, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase subunit beta / RNAP subunit beta / RNA polymerase subunit beta / Transcriptase subunit beta


Mass: 150820.875 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli)
Gene: rpoB, groN, nitB, rif, ron, stl, stv, tabD, b3987, JW3950
Production host: Escherichia coli (E. coli) / References: UniProt: P0A8V2, DNA-directed RNA polymerase
#4: Protein DNA-directed RNA polymerase subunit beta' / RNAP subunit beta' / RNA polymerase subunit beta' / Transcriptase subunit beta'


Mass: 158105.672 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpoC, tabB, b3988, JW3951 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A8T7, DNA-directed RNA polymerase
#5: Protein DNA-directed RNA polymerase subunit omega / RNAP omega subunit / RNA polymerase omega subunit / Transcriptase subunit omega


Mass: 10249.547 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpoZ, b3649, JW3624 / Production host: Escherichia coli (E. coli) / References: UniProt: P0A800, DNA-directed RNA polymerase

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Protein , 1 types, 1 molecules M

#6: Protein RNA polymerase sigma-54 factor


Mass: 54406.906 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli) / Gene: rpoN, glnF, ntrA, b3202, JW3169 / Production host: Escherichia coli (E. coli) / References: UniProt: P24255

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Non-polymers , 3 types, 11 molecules

#8: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#9: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn
#10: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 8 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestN

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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: EsN-dhsU36mm1 / Type: COMPLEX / Entity ID: #1-#7 / Source: MULTIPLE SOURCES
Molecular weight
IDEntity assembly-IDExperimental value
11NO
21NO
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPES1
2100 mMpotassium acetateKCH3COO1
310 mMmagnesium chlorideMgCl21
42 mMdithiothreitol1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: Chamber of self-built glow discharge unit was evacuated using a vacuum pump prior to application of voltage (no pressure and/or voltage readings available)
Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: C-flat-1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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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 / Nominal defocus max: 2500 nm / Nominal defocus min: 1000 nm
Image recordingAverage exposure time: 2 sec. / Electron dose: 51 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 12294
Details: dose-fractionation, 0.05 seconds/frame (=40 frames total)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategoryDetails
2Leginonimage acquisition
13cryoSPARCv2.153D reconstructionNU refinement (legacy)
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 602287
Details: Particle number and FSC resolution estimate of the full map provided
Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00231304
ELECTRON MICROSCOPYf_angle_d0.47842682
ELECTRON MICROSCOPYf_dihedral_angle_d15.53212118
ELECTRON MICROSCOPYf_chiral_restr0.0414894
ELECTRON MICROSCOPYf_plane_restr0.0045264

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