6OY5

X-ray crystal structure of a bacterial reiterative transcription complex of pyrG promoter at 3 min

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.208 

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Literature

Structural basis of reiterative transcription from the pyrG and pyrBI promoters by bacterial RNA polymerase.

Shin, Y., Hedglin, M., Murakami, K.S.

(2020) Nucleic Acids Res 48: 2144-2155

  • DOI: 10.1093/nar/gkz1221
  • Primary Citation of Related Structures:  
    6OVR, 6OVY, 6OW3, 6OY5, 6OY6, 6OY7, 6P70, 6P71

  • PubMed Abstract: 

    • Reiterative transcription is a non-canonical form of RNA synthesis by RNA polymerase in which a ribonucleotide specified by a single base in the DNA template is repetitively added to the nascent RNA transcript. We previously determined the X-ray crystal structure of the bacterial RNA polymerase engaged in reiterative transcription from the pyrG promoter, which contains eight poly-G RNA bases synthesized using three C bases in the DNA as a template and extends RNA without displacement of the promoter recognition σ factor from the core enzyme ...

    Reiterative transcription is a non-canonical form of RNA synthesis by RNA polymerase in which a ribonucleotide specified by a single base in the DNA template is repetitively added to the nascent RNA transcript. We previously determined the X-ray crystal structure of the bacterial RNA polymerase engaged in reiterative transcription from the pyrG promoter, which contains eight poly-G RNA bases synthesized using three C bases in the DNA as a template and extends RNA without displacement of the promoter recognition σ factor from the core enzyme. In this study, we determined a series of transcript initiation complex structures from the pyrG promoter using soak-trigger-freeze X-ray crystallography. We also performed biochemical assays to monitor template DNA translocation during RNA synthesis from the pyrG promoter and in vitro transcription assays to determine the length of poly-G RNA from the pyrG promoter variants. Our study revealed how RNA slips on template DNA and how RNA polymerase and template DNA determine length of reiterative RNA product. Lastly, we determined a structure of a transcript initiation complex at the pyrBI promoter and proposed an alternative mechanism of RNA slippage and extension requiring the σ dissociation from the core enzyme.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, Center for RNA Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alphaA, B315Thermus thermophilusMutation(s): 0 
Gene Names: rpoA
EC: 2.7.7.6
UniProt
Find proteins for Q9Z9H6 (Thermus thermophilus)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaC1119Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q8RQE9 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'D1524Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for Q8RQE8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaE99Thermus thermophilusMutation(s): 0 
Gene Names: rpoZ, TthAA229_16300, TthHC11_16190, TTHN1_00070, TTMY_2030
EC: 2.7.7.6
UniProt
Find proteins for A0A1J1EUF1 (Thermus thermophilus)
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
RNA polymerase sigma factor SigAF423Thermus thermophilusMutation(s): 0 
UniProt
Find proteins for Q72L95 (Thermus thermophilus (strain ATCC BAA-163 / DSM 7039 / HB27))
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  • Reference Sequence
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Entity ID: 6
MoleculeChainsLengthOrganismImage
DNA (5'-D(P*CP*CP*GP*CP*AP*TP*CP*AP*GP*AP*GP*CP*CP*CP*AP*AP*AP*AP*T)-3')G22Bacillus subtilis
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Entity ID: 7
MoleculeChainsLengthOrganismImage
DNA (5'-D(*AP*TP*AP*AP*TP*GP*GP*GP*AP*GP*CP*CP*TP*CP*TP*GP*AP*TP*GP*CP*AP*G)-3')H27Bacillus subtilis
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  • Reference Sequence
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    • Entity ID: 8
    MoleculeChainsLengthOrganismImage
    RNA (5'-D(*(GTP))-R(P*G)-3')I2Thermus thermophilus
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    Small Molecules
    Experimental Data & Validation

    Experimental Data

    • Method: X-RAY DIFFRACTION
    • Resolution: 3.10 Å
    • R-Value Free: 0.259 
    • R-Value Work: 0.207 
    • R-Value Observed: 0.208 
    • Space Group: C 1 2 1
    Unit Cell:
    Length ( Å )Angle ( ˚ )
    a = 186.106α = 90
    b = 102.417β = 99
    c = 297.237γ = 90
    Software Package:
    Software NamePurpose
    PHENIXrefinement
    HKL-2000data reduction
    HKL-2000data scaling
    PHENIXphasing

    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 StatesR01GM087350

    Revision History  (Full details and data files)

    • Version 1.0: 2019-06-05
      Type: Initial release
    • Version 1.1: 2020-01-01
      Changes: Author supporting evidence
    • Version 1.2: 2020-02-05
      Changes: Database references
    • Version 1.3: 2020-03-11
      Changes: Database references