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- PDB-7ogk: A cooperative PNPase-Hfq-RNA carrier complex facilitates bacteria... -

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Basic information

Entry
Database: PDB / ID: 7ogk
TitleA cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation. PNPase-3'ETS(leuZ)
Components
  • 3'ETS(LeuZ)
  • Polyribonucleotide nucleotidyltransferasePolynucleotide phosphorylase
KeywordsRNA BINDING PROTEIN / RNA chaperone / Ribonuclease / Small regulatory RNA / Riboregulation
Function / homology
Function and homology information


polyribonucleotide nucleotidyltransferase / polyribonucleotide nucleotidyltransferase activity / bacterial degradosome / cyclic-di-GMP binding / RNA catabolic process / mRNA catabolic process / RNA processing / 3'-5'-RNA exonuclease activity / response to heat / magnesium ion binding ...polyribonucleotide nucleotidyltransferase / polyribonucleotide nucleotidyltransferase activity / bacterial degradosome / cyclic-di-GMP binding / RNA catabolic process / mRNA catabolic process / RNA processing / 3'-5'-RNA exonuclease activity / response to heat / magnesium ion binding / RNA binding / membrane / identical protein binding / cytosol
Similarity search - Function
Polyribonucleotide nucleotidyltransferase / Polyribonucleotide nucleotidyltransferase, RNA-binding domain / Polyribonucleotide nucleotidyltransferase, RNA-binding domain superfamily / Polyribonucleotide nucleotidyltransferase, RNA binding domain / Exoribonuclease, phosphorolytic domain 2 / 3' exoribonuclease family, domain 2 / Exoribonuclease, phosphorolytic domain 1 / PNPase/RNase PH domain superfamily / Exoribonuclease, PH domain 2 superfamily / 3' exoribonuclease family, domain 1 ...Polyribonucleotide nucleotidyltransferase / Polyribonucleotide nucleotidyltransferase, RNA-binding domain / Polyribonucleotide nucleotidyltransferase, RNA-binding domain superfamily / Polyribonucleotide nucleotidyltransferase, RNA binding domain / Exoribonuclease, phosphorolytic domain 2 / 3' exoribonuclease family, domain 2 / Exoribonuclease, phosphorolytic domain 1 / PNPase/RNase PH domain superfamily / Exoribonuclease, PH domain 2 superfamily / 3' exoribonuclease family, domain 1 / KH domain / K Homology domain, type 1 / Type-1 KH domain profile. / K Homology domain, type 1 superfamily / S1 domain profile. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / K Homology domain / K homology RNA-binding domain / Ribosomal protein S5 domain 2-type fold / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
RNA / Polyribonucleotide nucleotidyltransferase
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsDendooven, T. / Sinha, D. / Roesoleva, A. / Cameron, T.A. / De Lay, N. / Luisi, B.F. / Bandyra, K.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Wellcome Trust United Kingdom
CitationJournal: Mol Cell / Year: 2021
Title: A cooperative PNPase-Hfq-RNA carrier complex facilitates bacterial riboregulation.
Authors: Tom Dendooven / Dhriti Sinha / Alzbeta Roeselová / Todd A Cameron / Nicholas R De Lay / Ben F Luisi / Katarzyna J Bandyra /
Abstract: Polynucleotide phosphorylase (PNPase) is an ancient exoribonuclease conserved in the course of evolution and is found in species as diverse as bacteria and humans. Paradoxically, Escherichia coli ...Polynucleotide phosphorylase (PNPase) is an ancient exoribonuclease conserved in the course of evolution and is found in species as diverse as bacteria and humans. Paradoxically, Escherichia coli PNPase can act not only as an RNA degrading enzyme but also by an unknown mechanism as a chaperone for small regulatory RNAs (sRNAs), with pleiotropic consequences for gene regulation. We present structures of the ternary assembly formed by PNPase, the RNA chaperone Hfq, and sRNA and show that this complex boosts sRNA stability in vitro. Comparison of structures for PNPase in RNA carrier and degradation modes reveals how the RNA is rerouted away from the active site through interactions with Hfq and the KH and S1 domains. Together, these data explain how PNPase is repurposed to protect sRNAs from cellular ribonucleases such as RNase E and could aid RNA presentation to facilitate regulatory actions on target genes.
History
DepositionMay 6, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jul 7, 2021Provider: repository / Type: Initial release
Revision 1.1Jul 28, 2021Group: Database references / Category: citation / Item: _citation.journal_volume / _citation.page_first

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Structure visualization

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Assembly

Deposited unit
A: Polyribonucleotide nucleotidyltransferase
B: Polyribonucleotide nucleotidyltransferase
C: Polyribonucleotide nucleotidyltransferase
D: 3'ETS(LeuZ)


Theoretical massNumber of molelcules
Total (without water)234,1584
Polymers234,1584
Non-polymers00
Water30617
1


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

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Components

#1: Protein Polyribonucleotide nucleotidyltransferase / Polynucleotide phosphorylase / Polynucleotide phosphorylase / PNPase


Mass: 77189.844 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: pnp, b3164, JW5851 / Production host: Escherichia coli (E. coli)
References: UniProt: P05055, polyribonucleotide nucleotidyltransferase
#2: RNA chain 3'ETS(LeuZ)


Mass: 2588.689 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Escherichia coli (E. coli)
#3: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 17 / Source method: isolated from a natural source / Formula: H2O

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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: PNPase / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.253 MDa / Experimental value: NO
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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 FIELDBright-field microscopy / Nominal magnification: 130000 X / Nominal defocus max: -2.6 nm / Nominal defocus min: -1 nm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 12 sec. / Electron dose: 53.6 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2741
Image scansMovie frames/image: 38 / Used frames/image: 1-38

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Processing

EM software
IDNameVersionCategory
2cryoSPARC2.15particle selection
3Warp1.0.9particle selection
4EPUimage acquisition
6Gctf1.06CTF correction
7Warp1.0.9CTF correction
12Coot0.9 Premodel refinement
13REFMAC5model refinement
14PHENIX1.18model refinement
15RELION3.1initial Euler assignment
16RELION3.1final Euler assignment
17RELION3.1classification
18cryoSPARC2.153D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 206803 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT

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