National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
GM067153
United States
Citation
Journal: Nat Commun / Year: 2020 Title: The δ subunit and NTPase HelD institute a two-pronged mechanism for RNA polymerase recycling. Authors: Hao-Hong Pei / Tarek Hilal / Zhuo A Chen / Yong-Heng Huang / Yuan Gao / Nelly Said / Bernhard Loll / Juri Rappsilber / Georgiy A Belogurov / Irina Artsimovitch / Markus C Wahl / Abstract: Cellular RNA polymerases (RNAPs) can become trapped on DNA or RNA, threatening genome stability and limiting free enzyme pools, but how RNAP recycling into active states is achieved remains elusive. ...Cellular RNA polymerases (RNAPs) can become trapped on DNA or RNA, threatening genome stability and limiting free enzyme pools, but how RNAP recycling into active states is achieved remains elusive. In Bacillus subtilis, the RNAP δ subunit and NTPase HelD have been implicated in RNAP recycling. We structurally analyzed Bacillus subtilis RNAP-δ-HelD complexes. HelD has two long arms: a Gre cleavage factor-like coiled-coil inserts deep into the RNAP secondary channel, dismantling the active site and displacing RNA, while a unique helical protrusion inserts into the main channel, prying the β and β' subunits apart and, aided by δ, dislodging DNA. RNAP is recycled when, after releasing trapped nucleic acids, HelD dissociates from the enzyme in an ATP-dependent manner. HelD abundance during slow growth and a dimeric (RNAP-δ-HelD) structure that resembles hibernating eukaryotic RNAP I suggest that HelD might also modulate active enzyme pools in response to cellular cues.
History
Deposition
May 29, 2020
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Header (metadata) release
Oct 14, 2020
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Map release
Oct 14, 2020
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Update
Apr 28, 2021
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Current status
Apr 28, 2021
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Entire : Recycling complex of Bacillus subitilis RNAP with HelD
Entire
Name: Recycling complex of Bacillus subitilis RNAP with HelD
Components
Complex: Recycling complex of Bacillus subitilis RNAP with HelD
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Supramolecule #1: Recycling complex of Bacillus subitilis RNAP with HelD
Supramolecule
Name: Recycling complex of Bacillus subitilis RNAP with HelD type: complex / ID: 1 / Parent: 0
Source (natural)
Organism: Bacillus subtilis (bacteria)
Molecular weight
Theoretical: 600 KDa
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
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Sample preparation
Concentration
5 mg/mL
Buffer
pH: 7.6
Grid
Model: Quantifoil R1.2/1.3 / Support film - Material: CARBON / Support film - topology: HOLEY
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 303 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number real images: 9130 / Average exposure time: 36.0 sec. / Average electron dose: 40.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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