4XSX

Crystal structure of CBR 703 bound to Escherichia coli RNA polymerase holoenzyme

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 

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This is version 1.4 of the entry. See complete history. 


Literature

CBR antimicrobials inhibit RNA polymerase via at least two bridge-helix cap-mediated effects on nucleotide addition.

Bae, B., Nayak, D., Ray, A., Mustaev, A., Landick, R., Darst, S.A.

(2015) Proc Natl Acad Sci U S A 112: E4178-E4187

  • DOI: 10.1073/pnas.1502368112
  • Primary Citation of Related Structures:  
    4XSX, 4XSY, 4XSZ

  • PubMed Abstract: 

    • RNA polymerase inhibitors like the CBR class that target the enzyme's complex catalytic center are attractive leads for new antimicrobials. Catalysis by RNA polymerase involves multiple rearrangements of bridge helix, trigger loop, and active-center ...

    RNA polymerase inhibitors like the CBR class that target the enzyme's complex catalytic center are attractive leads for new antimicrobials. Catalysis by RNA polymerase involves multiple rearrangements of bridge helix, trigger loop, and active-center side chains that isomerize the triphosphate of bound NTP and two Mg(2+) ions from a preinsertion state to a reactive configuration. CBR inhibitors target a crevice between the N-terminal portion of the bridge helix and a surrounding cap region within which the bridge helix is thought to rearrange during the nucleotide addition cycle. We report crystal structures of CBR inhibitor/Escherichia coli RNA polymerase complexes as well as biochemical tests that establish two distinct effects of the inhibitors on the RNA polymerase catalytic site. One effect involves inhibition of trigger-loop folding via the F loop in the cap, which affects both nucleotide addition and hydrolysis of 3'-terminal dinucleotides in certain backtracked complexes. The second effect is trigger-loop independent, affects only nucleotide addition and pyrophosphorolysis, and may involve inhibition of bridge-helix movements that facilitate reactive triphosphate alignment.

    Organizational Affiliation: 

    The Rockefeller University, New York, NY 10065; darst@rockefeller.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alphaA, B, G, H239Escherichia coli O139:H28 str. E24377AMutation(s): 0 
Gene Names: rpoA, EcE24377A_3778
EC: 2.7.7.6
Find proteins for A7ZSI4 (Escherichia coli O139:H28 (strain E24377A / ETEC))
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Go to UniProtKB:  A7ZSI4
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaC, I1342Escherichia coli O139:H28 str. E24377AMutation(s): 0 
Gene Names: rpoB, EcE24377A_4528
EC: 2.7.7.6
Find proteins for A7ZUK1 (Escherichia coli O139:H28 (strain E24377A / ETEC))
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta'D, J1407Escherichia coli O139:H28 str. E24377AMutation(s): 0 
Gene Names: rpoC, EcE24377A_4529
EC: 2.7.7.6
Find proteins for A7ZUK2 (Escherichia coli O139:H28 (strain E24377A / ETEC))
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit omegaE, K91Citrobacter koseri ATCC BAA-895Mutation(s): 0 
Gene Names: rpoZ, CKO_05106
EC: 2.7.7.6
Find proteins for A8ARN6 (Citrobacter koseri (strain ATCC BAA-895 / CDC 4225-83 / SGSC4696))
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
RNA polymerase sigma factor RpoDF, L522Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoD, alt, b3067, JW3039
Find proteins for P00579 (Escherichia coli (strain K12))
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.71 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.232 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 187.025α = 90
b = 206.914β = 90
c = 310.04γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
HKL-2000data reduction
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
SCALEPACKdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2015-01-22 
  • Released Date: 2015-07-22 
    • Deposition Author(s): Bae, B., Darst, S.A.

Revision History 

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-08-05
    Changes: Database references
  • Version 1.2: 2015-08-19
    Changes: Database references
  • Version 1.3: 2016-03-23
    Changes: Other
  • Version 1.4: 2017-11-22
    Changes: Derived calculations, Refinement description