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- PDB-7xyb: The cryo-EM structure of an AlpA-loaded complex -

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Basic information

Entry
Database: PDB / ID: 7xyb
TitleThe cryo-EM structure of an AlpA-loaded complex
Components
  • (DNA-directed RNA polymerase subunit ...Polymerase) x 4
  • AlpA
  • RNA
  • nontemplate strand DNA
  • template strand DNA
KeywordsTRANSCRIPTION / Antitermination / RNA polymerase / Transcription regulation / Antiterminator / Transcription termination
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 / DNA (> 10) / RNA / RNA (> 10) / Helix-turn-helix domain-containing protein / DNA-directed RNA polymerase subunit alpha / DNA-directed RNA polymerase subunit beta / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta'
Similarity search - Component
Biological speciesPseudomonas aeruginosa (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsWen, A. / Feng, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31970040 China
CitationJournal: Nucleic Acids Res / Year: 2022
Title: Structural basis of AlpA-dependent transcription antitermination.
Authors: Aijia Wen / Minxing Zhao / Sha Jin / Yuan-Qiang Lu / Yu Feng /
Abstract: AlpA positively regulates a programmed cell death pathway linked to the virulence of Pseudomonas aeruginosa by recognizing an AlpA binding element within the promoter, then binding RNA polymerase ...AlpA positively regulates a programmed cell death pathway linked to the virulence of Pseudomonas aeruginosa by recognizing an AlpA binding element within the promoter, then binding RNA polymerase directly and allowing it to bypass an intrinsic terminator positioned downstream. Here, we report the single-particle cryo-electron microscopy structures of both an AlpA-loading complex and an AlpA-loaded complex. These structures indicate that the C-terminal helix-turn-helix motif of AlpA binds to the AlpA binding element and that the N-terminal segment of AlpA forms a narrow ring inside the RNA exit channel. AlpA was also revealed to render RNAP resistant to termination signals by prohibiting RNA hairpin formation in the RNA exit channel. Structural analysis predicted that AlpA, 21Q, λQ and 82Q share the same mechanism of transcription antitermination.
History
DepositionJun 1, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 20, 2022Provider: repository / Type: Initial release
Revision 1.1Aug 10, 2022Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed ..._citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Aug 24, 2022Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DNA-directed RNA polymerase subunit alpha
B: DNA-directed RNA polymerase subunit alpha
C: DNA-directed RNA polymerase subunit beta
D: DNA-directed RNA polymerase subunit beta'
E: DNA-directed RNA polymerase subunit omega
G: AlpA
R: RNA
N: nontemplate strand DNA
T: template strand DNA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)462,48810
Polymers462,4649
Non-polymers241
Water0
1


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

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Components

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

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


Mass: 36694.555 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pseudomonas aeruginosa (bacteria)
Strain: ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1
Gene: rpoA, PA4238 / Production host: Escherichia coli (E. coli) / References: UniProt: O52760, DNA-directed RNA polymerase
#2: Protein DNA-directed RNA polymerase subunit beta / Polymerase / RNAP subunit beta / RNA polymerase subunit beta / Transcriptase subunit beta


Mass: 151037.047 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pseudomonas aeruginosa (bacteria)
Strain: ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1
Gene: rpoB, PA4270 / Production host: Escherichia coli (E. coli) / References: UniProt: Q51561, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase subunit beta' / Polymerase / RNAP subunit beta' / RNA polymerase subunit beta' / Transcriptase subunit beta'


Mass: 154595.000 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pseudomonas aeruginosa (bacteria)
Strain: ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1
Gene: rpoC, PA4269 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9HWC9, DNA-directed RNA polymerase
#4: Protein DNA-directed RNA polymerase subunit omega / Polymerase / RNAP omega subunit / RNA polymerase omega subunit / Transcriptase subunit omega


Mass: 9783.876 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pseudomonas aeruginosa (bacteria)
Strain: ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1
Gene: rpoZ, PA5337 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9HTM1, DNA-directed RNA polymerase

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DNA chain , 2 types, 2 molecules NT

#7: DNA chain nontemplate strand DNA


Mass: 24919.896 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Pseudomonas aeruginosa (bacteria)
#8: DNA chain template strand DNA


Mass: 23800.312 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Pseudomonas aeruginosa (bacteria)

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Protein / RNA chain / Non-polymers , 3 types, 3 molecules GR

#5: Protein AlpA


Mass: 20315.600 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Pseudomonas aeruginosa (bacteria) / Gene: CSB93_5829 / Production host: Escherichia coli (E. coli) / References: UniProt: A0A2R3ITY7
#6: RNA chain RNA /


Mass: 4622.804 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Pseudomonas aeruginosa (bacteria)
#9: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg

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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: AlpA-loaded complex / Type: COMPLEX / Entity ID: #1-#8 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Pseudomonas aeruginosa (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1800 nm / Nominal defocus min: 900 nm
Image recordingElectron dose: 52 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 31470 / Symmetry type: POINT

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