6TYE

Crystal structure of MTB sigma L transcription initiation complex with 5 nt long RNA primer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.79 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

RNA extension drives a stepwise displacement of an initiation-factor structural module in initial transcription.

Li, L.Molodtsov, V.Lin, W.Ebright, R.H.Zhang, Y.

(2020) Proc Natl Acad Sci U S A 117: 5801-5809

  • DOI: https://doi.org/10.1073/pnas.1920747117
  • Primary Citation of Related Structures:  
    6KON, 6KOO, 6KOP, 6KOQ, 6KQD, 6KQE, 6KQF, 6KQG, 6KQH, 6KQL, 6KQM, 6KQN, 6L74, 6LTS, 6TYE, 6TYF, 6TYG

  • PubMed Abstract: 

    All organisms-bacteria, archaea, and eukaryotes-have a transcription initiation factor that contains a structural module that binds within the RNA polymerase (RNAP) active-center cleft and interacts with template-strand single-stranded DNA (ssDNA) in the immediate vicinity of the RNAP active center. This transcription initiation-factor structural module preorganizes template-strand ssDNA to engage the RNAP active center, thereby facilitating binding of initiating nucleotides and enabling transcription initiation from initiating mononucleotides. However, this transcription initiation-factor structural module occupies the path of nascent RNA and thus presumably must be displaced before or during initial transcription. Here, we report four sets of crystal structures of bacterial initially transcribing complexes that demonstrate and define details of stepwise, RNA-extension-driven displacement of the "σ-finger" of the bacterial transcription initiation factor σ. The structures reveal that-for both the primary σ-factor and extracytoplasmic (ECF) σ-factors, and for both 5'-triphosphate RNA and 5'-hydroxy RNA-the "σ-finger" is displaced in stepwise fashion, progressively folding back upon itself, driven by collision with the RNA 5'-end, upon extension of nascent RNA from ∼5 nt to ∼10 nt.


  • Organizational Affiliation

    Key Laboratory of Synthetic Biology, Chinese Academy of Sciences Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 200032 Shanghai, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
RNA polymerase sigma factorA [auth F]177Mycobacterium tuberculosisMutation(s): 0 
Gene Names: 
UniProt
Find proteins for P9WGH5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
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UniProt GroupP9WGH5
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alphaE [auth A],
F [auth B]
347Mycobacterium tuberculosisMutation(s): 0 
Gene Names: rpoA
EC: 2.7.7.6
UniProt
Find proteins for P9WGZ1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
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UniProt GroupP9WGZ1
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaG [auth C]1,178Mycobacterium tuberculosisMutation(s): 0 
Gene Names: rpoB
EC: 2.7.7.6
UniProt
Find proteins for P9WGY9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
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UniProt GroupP9WGY9
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'H [auth D]1,316Mycobacterium tuberculosisMutation(s): 0 
Gene Names: rpoCERS027656_00588
EC: 2.7.7.6
UniProt
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UniProt GroupP9WGY7
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaI [auth E]110Mycobacterium tuberculosisMutation(s): 0 
Gene Names: 
EC: 2.7.7.6
UniProt
Find proteins for P9WGY5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
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UniProt GroupP9WGY5
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Entity ID: 2
MoleculeChains LengthOrganismImage
DNA (5'-D(*GP*CP*AP*TP*CP*CP*GP*TP*GP*AP*AP*TP*CP*GP*AP*GP*G)-3')B [auth G]17Mycobacterium tuberculosis
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Entity ID: 3
MoleculeChains LengthOrganismImage
DNA (5'-D(P*GP*TP*GP*TP*CP*AP*GP*TP*AP*GP*CP*TP*GP*TP*CP*AP*CP*GP*GP*AP*TP*GP*C)-3')C [auth H]27Mycobacterium tuberculosis
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Entity ID: 4
MoleculeChains LengthOrganismImage
RNA (5'-R(P*CP*UP*CP*GP*A)-3')D [auth I]5Mycobacterium tuberculosis
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.79 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.527α = 90
b = 158.522β = 90
c = 214.656γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
HKL-3000phasing

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 States--

Revision History  (Full details and data files)

  • Version 1.0: 2020-03-11
    Type: Initial release
  • Version 1.1: 2020-03-25
    Changes: Database references
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description