6P1K

Cryo-EM structure of Escherichia coli sigma70 bound RNAP polymerase holoenzyme


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.05 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

E. coliTraR allosterically regulates transcription initiation by altering RNA polymerase conformation.

Chen, J.Gopalkrishnan, S.Chiu, C.Chen, A.Y.Campbell, E.A.Gourse, R.L.Ross, W.Darst, S.A.

(2019) Elife 8

  • DOI: https://doi.org/10.7554/eLife.49375
  • Primary Citation of Related Structures:  
    6N57, 6N58, 6OUL, 6P1K

  • PubMed Abstract: 

    TraR and its homolog DksA are bacterial proteins that regulate transcription initiation by binding directly to RNA polymerase (RNAP) rather than to promoter DNA. Effects of TraR mimic the combined effects of DksA and its cofactor ppGpp, but the structural basis for regulation by these factors remains unclear. Here, we use cryo-electron microscopy to determine structures of Escherichia coli RNAP, with or without TraR, and of an RNAP-promoter complex. TraR binding induced RNAP conformational changes not seen in previous crystallographic analyses, and a quantitative analysis revealed TraR-induced changes in RNAP conformational heterogeneity. These changes involve mobile regions of RNAP affecting promoter DNA interactions, including the βlobe, the clamp, the bridge helix, and several lineage-specific insertions. Using mutational approaches, we show that these structural changes, as well as effects on σ 70 region 1.1, are critical for transcription activation or inhibition, depending on the kinetic features of regulated promoters.


  • Organizational Affiliation

    The Rockefeller University, New York, United States.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alphaA [auth G],
B [auth H]
329Escherichia coliMutation(s): 0 
Gene Names: rpoApezphssezb3295JW3257
EC: 2.7.7.6
UniProt
Find proteins for P0A7Z4 (Escherichia coli (strain K12))
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UniProt GroupP0A7Z4
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaC [auth I]1,342Escherichia coliMutation(s): 0 
Gene Names: rpoBZ5560ECs4910
EC: 2.7.7.6
UniProt
Find proteins for P0A8V2 (Escherichia coli (strain K12))
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UniProt GroupP0A8V2
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'D [auth J]1,430Escherichia coliMutation(s): 0 
Gene Names: rpoCtabBb3988JW3951
EC: 2.7.7.6
UniProt
Find proteins for P0A8T7 (Escherichia coli (strain K12))
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UniProt GroupP0A8T7
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaE [auth K]91Escherichia coliMutation(s): 0 
Gene Names: rpoZZ5075ECs4524
EC: 2.7.7.6
UniProt
Find proteins for P0A800 (Escherichia coli (strain K12))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
RNA polymerase sigma factor RpoDF [auth L]616Escherichia coliMutation(s): 0 
Gene Names: rpoD
UniProt
Find proteins for P00579 (Escherichia coli (strain K12))
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UniProt GroupP00579
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.05 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-02-26
    Type: Initial release
  • Version 1.1: 2024-03-13
    Changes: Data collection, Database references