6WMT

F. tularensis RNAPs70-(MglA-SspA)-ppGpp-PigR-iglA DNA complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Structural Basis for Virulence Activation of Francisella tularensis.

Travis, B.A.Ramsey, K.M.Prezioso, S.M.Tallo, T.Wandzilak, J.M.Hsu, A.Borgnia, M.Bartesaghi, A.Dove, S.L.Brennan, R.G.Schumacher, M.A.

(2021) Mol Cell 81: 139

  • DOI: https://doi.org/10.1016/j.molcel.2020.10.035
  • Primary Citation of Related Structures:  
    6WEG, 6WMP, 6WMR, 6WMT, 6WMU

  • PubMed Abstract: 

    The bacterium Francisella tularensis (Ft) is one of the most infectious agents known. Ft virulence is controlled by a unique combination of transcription regulators: the MglA-SspA heterodimer, PigR, and the stress signal, ppGpp. MglA-SspA assembles with the σ 70 -associated RNAP holoenzyme (RNAPσ 70 ), forming a virulence-specialized polymerase. These factors activate Francisella pathogenicity island (FPI) gene expression, which is required for virulence, but the mechanism is unknown. Here we report FtRNAPσ 70 -promoter-DNA, FtRNAPσ 70 -(MglA-SspA)-promoter DNA, and FtRNAPσ 70 -(MglA-SspA)-ppGpp-PigR-promoter DNA cryo-EM structures. Structural and genetic analyses show MglA-SspA facilitates σ 70 binding to DNA to regulate virulence and virulence-enhancing genes. Our Escherichia coli RNAPσ 70- homodimeric EcSspA structure suggests this is a general SspA-transcription regulation mechanism. Strikingly, our FtRNAPσ 70 -(MglA-SspA)-ppGpp-PigR-DNA structure reveals ppGpp binding to MglA-SspA tethers PigR to promoters. PigR in turn recruits FtRNAP αCTDs to DNA UP elements. Thus, these studies unveil a unique mechanism for Ft pathogenesis involving a virulence-specialized RNAP that employs two (MglA-SspA)-based strategies to activate virulence genes.


  • Organizational Affiliation

    Department of Biochemistry, Duke University School of Medicine, Durham, NC 27710, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaA [auth E]72Francisella tularensis subsp. holarctica LVSMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q2A273 (Francisella tularensis subsp. holarctica (strain LVS))
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UniProt GroupQ2A273
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alpha 1B [auth A]323Francisella tularensis subsp. holarctica LVSMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q2A5E5 (Francisella tularensis subsp. holarctica (strain LVS))
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alpha 2C [auth B]317Francisella tularensis subsp. holarctica LVSMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q2A4H7 (Francisella tularensis subsp. holarctica (strain LVS))
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaD [auth C]1,358Francisella tularensis subsp. holarctica LVSMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q2A1M7 (Francisella tularensis subsp. holarctica (strain LVS))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'E [auth D]1,604Francisella tularensis subsp. holarctica LVSMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q2A1M8 (Francisella tularensis subsp. holarctica (strain LVS))
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
aCTDsI [auth K],
J [auth L]
73Francisella tularensis subsp. holarctica LVSMutation(s): 0 
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
Macrophage growth locus, subunit AK [auth M]205Francisella tularensis subsp. holarctica LVSMutation(s): 0 
UniProt
Find proteins for A0A0B6CT24 (Francisella tularensis subsp. holarctica)
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
Glutathione S-transferaseL [auth S]210Francisella tularensis subsp. holarctica LVSMutation(s): 0 
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
RNA polymerase sigma factor RpoDN [auth Z]577Francisella tularensis subsp. holarctica LVSMutation(s): 0 
UniProt
Find proteins for A0A0B3WH85 (Francisella tularensis subsp. holarctica)
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.43 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.17
RECONSTRUCTIONRELION3.0

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM130290

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-11
    Type: Initial release
  • Version 1.1: 2020-12-02
    Changes: Database references
  • Version 1.2: 2021-01-20
    Changes: Database references
  • Version 2.0: 2021-02-03
    Type: Coordinate replacement
    Reason: Model completeness
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Polymer sequence, Source and taxonomy, Structure summary
  • Version 2.1: 2024-03-06
    Changes: Data collection, Database references