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- PDB-8be0: Early transcription elongation state of influenza B/Mem polymeras... -

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Basic information

Entry
Database: PDB / ID: 8be0
TitleEarly transcription elongation state of influenza B/Mem polymerase backtracked due to double incoproation of nucleotide analogue T1106 and with singly incoporated T1106 at the C +1 position
Components
  • 3' vRNA
  • 5' vRNA
  • Polymerase acidic protein
  • Polymerase basic protein 2
  • RNA-directed RNA polymerase catalytic subunit
  • mRNAMessenger RNA
KeywordsVIRAL PROTEIN / Influenza / viral RNA-dependent RNA polymerase / antiviral drug / nucleoside analogue / T705 (favipiravir) / T1106 / cap-dependent transcription / backtracking
Function / homology
Function and homology information


symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / cap snatching / 7-methylguanosine mRNA capping / viral transcription / host cell mitochondrion / virion component / endonuclease activity / host cell cytoplasm / Hydrolases; Acting on ester bonds / RNA-directed RNA polymerase ...symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / cap snatching / 7-methylguanosine mRNA capping / viral transcription / host cell mitochondrion / virion component / endonuclease activity / host cell cytoplasm / Hydrolases; Acting on ester bonds / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / nucleotide binding / DNA-templated transcription / host cell nucleus / RNA binding / metal ion binding
Similarity search - Function
Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB2 / PB2, C-terminal / : / : / : / : / : / Influenza RNA polymerase PB2 N-terminal region ...Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB1 / Influenza RNA-dependent RNA polymerase subunit PB2 / PB2, C-terminal / : / : / : / : / : / Influenza RNA polymerase PB2 N-terminal region / Influenza RNA polymerase PB2 second domain / Influenza RNA polymerase PB2 middle domain / Influenza RNA polymerase PB2 6th domain / Influenza RNA polymerase PB2 C-terminal domain / : / : / Influenza RNA polymerase PB2 helical domain / Influenza RNA polymerase PB2 CAP binding domain / Polymerase acidic protein / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile. / Influenza RNA-dependent RNA polymerase subunit PA / Influenza RNA-dependent RNA polymerase subunit PA, endonuclease domain / Influenza RNA-dependent RNA polymerase subunit PA
Similarity search - Domain/homology
Chem-GTA / RNA / RNA (> 10) / Polymerase basic protein 2 / RNA-directed RNA polymerase catalytic subunit / Polymerase acidic protein
Similarity search - Component
Biological speciesInfluenza B virus
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.34 Å
AuthorsCusack, S. / Kouba, T.
Funding support France, 1items
OrganizationGrant numberCountry
French National Research Agency France
CitationJournal: Cell Rep / Year: 2023
Title: Direct observation of backtracking by influenza A and B polymerases upon consecutive incorporation of the nucleoside analog T1106.
Authors: Tomas Kouba / Anna Dubankova / Petra Drncova / Elisa Donati / Pietro Vidossich / Valentina Speranzini / Alex Pflug / Johanna Huchting / Chris Meier / Marco De Vivo / Stephen Cusack /
Abstract: The antiviral pseudo-base T705 and its de-fluoro analog T1106 mimic adenine or guanine and can be competitively incorporated into nascent RNA by viral RNA-dependent RNA polymerases. Although ...The antiviral pseudo-base T705 and its de-fluoro analog T1106 mimic adenine or guanine and can be competitively incorporated into nascent RNA by viral RNA-dependent RNA polymerases. Although dispersed, single pseudo-base incorporation is mutagenic, consecutive incorporation causes polymerase stalling and chain termination. Using a template encoding single and then consecutive T1106 incorporation four nucleotides later, we obtained a cryogenic electron microscopy structure of stalled influenza A/H7N9 polymerase. This shows that the entire product-template duplex backtracks by 5 nt, bringing the singly incorporated T1106 to the +1 position, where it forms an unexpected T1106:U wobble base pair. Similar structures show that influenza B polymerase also backtracks after consecutive T1106 incorporation, regardless of whether prior single incorporation has occurred. These results give insight into the unusual mechanism of chain termination by pyrazinecarboxamide base analogs. Consecutive incorporation destabilizes the proximal end of the product-template duplex, promoting irreversible backtracking to a more energetically favorable overall configuration.
History
DepositionOct 20, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 28, 2022Provider: repository / Type: Initial release
Revision 1.1Jan 18, 2023Group: Database references / Category: citation / citation_author
Item: _citation.page_first / _citation.page_last ..._citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 2.0Feb 15, 2023Group: Atomic model / Data collection ...Atomic model / Data collection / Database references / Derived calculations / Polymer sequence / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / citation / entity / entity_poly / entity_poly_seq / ndb_struct_na_base_pair / ndb_struct_na_base_pair_step / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_poly_seq_scheme / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / struct_asym / struct_conn / struct_ref_seq
Item: _atom_site.B_iso_or_equiv / _atom_site.Cartn_x ..._atom_site.B_iso_or_equiv / _atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_asym_id / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.auth_seq_id / _atom_site.group_PDB / _atom_site.label_asym_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.label_entity_id / _atom_site.label_seq_id / _atom_site.type_symbol / _chem_comp.name / _chem_comp.pdbx_synonyms / _citation.journal_volume / _citation.year / _entity_poly.pdbx_seq_one_letter_code / _entity_poly.pdbx_seq_one_letter_code_can / _ndb_struct_na_base_pair.j_label_seq_id / _ndb_struct_na_base_pair_step.j_label_seq_id_1 / _ndb_struct_na_base_pair_step.j_label_seq_id_2 / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id / _struct_ref_seq.db_align_beg / _struct_ref_seq.pdbx_auth_seq_align_beg / _struct_ref_seq.seq_align_end

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Polymerase acidic protein
B: RNA-directed RNA polymerase catalytic subunit
C: Polymerase basic protein 2
V: 5' vRNA
R: 3' vRNA
M: mRNA
hetero molecules


Theoretical massNumber of molelcules
Total (without water)281,2129
Polymers280,3766
Non-polymers8363
Water1,71195
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area47520 Å2
ΔGint-310 kcal/mol
Surface area87580 Å2
MethodPISA

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Components

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Protein , 3 types, 3 molecules ABC

#1: Protein Polymerase acidic protein / RNA-directed RNA polymerase subunit P2


Mass: 85822.781 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza B virus (B/Memphis/13/2003) / Strain: B/Memphis/13/2003 / Gene: PA / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: Q5V8Z9, Hydrolases; Acting on ester bonds
#2: Protein RNA-directed RNA polymerase catalytic subunit / Polymerase basic protein 1 / PB1 / RNA-directed RNA polymerase subunit P1


Mass: 86207.016 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza B virus (B/Memphis/13/2003) / Strain: B/Memphis/13/2003 / Gene: PB1 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q5V8Y6, RNA-directed RNA polymerase
#3: Protein Polymerase basic protein 2 / RNA-directed RNA polymerase subunit P3


Mass: 90844.109 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Influenza B virus (B/Memphis/13/2003) / Strain: B/Memphis/13/2003 / Gene: PB2 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: Q5V8X3

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RNA chain , 3 types, 3 molecules VRM

#4: RNA chain 5' vRNA


Mass: 4495.740 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Influenza B virus
#5: RNA chain 3' vRNA


Mass: 6698.029 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Influenza B virus
#6: RNA chain mRNA / Messenger RNA


Mass: 6308.756 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Influenza B virus

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Non-polymers , 3 types, 98 molecules

#7: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#8: Chemical ChemComp-GTA / P1-7-METHYLGUANOSINE-P3-ADENOSINE-5',5'-TRIPHOSPHATE / 7-METHYL-GPPPA


Mass: 787.441 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C21H30N10O17P3
#9: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 95 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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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: Early transcription elongation state of influenza B/Mem polymerase backtracked due to double incoproation of nucleotide analogue T1106 and with singly incoporated T1106 at the C +1 position
Type: COMPLEX / Entity ID: #1-#6 / Source: RECOMBINANT
Source (natural)Organism: Influenza B virus (B/Memphis/13/2003)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7.4
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: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 2.34 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 302395 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00318782
ELECTRON MICROSCOPYf_angle_d0.47925526
ELECTRON MICROSCOPYf_dihedral_angle_d9.2843003
ELECTRON MICROSCOPYf_chiral_restr0.0382842
ELECTRON MICROSCOPYf_plane_restr0.0043111

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