7MKO

Escherichia coli RNA polymerase elongation complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.15 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.3 of the entry. See complete history


Literature

Structural basis of RNA polymerase recycling by the Swi2/Snf2 family of ATPase RapA in Escherichia coli.

Qayyum, M.Z.Molodtsov, V.Renda, A.Murakami, K.S.

(2021) J Biol Chem 297: 101404-101404

  • DOI: https://doi.org/10.1016/j.jbc.2021.101404
  • Primary Citation of Related Structures:  
    7MKN, 7MKO, 7MKP, 7MKQ

  • PubMed Abstract: 

    After transcription termination, cellular RNA polymerases (RNAPs) are occasionally trapped on DNA, impounded in an undefined post-termination complex (PTC), limiting the free RNAP pool and subsequently leading to inefficient transcription. In Escherichia coli, a Swi2/Snf2 family of ATPase called RapA is known to be involved in countering such inefficiency through RNAP recycling; however, the precise mechanism of this recycling is unclear. To better understand its mechanism, here we determined the structures of two sets of E. coli RapA-RNAP complexes, along with the RNAP core enzyme and the elongation complex, using cryo-EM. These structures revealed the large conformational changes of RNAP and RapA upon their association that has been implicated in the hindrance of PTC formation. Our results along with DNA-binding assays reveal that although RapA binds RNAP away from the DNA-binding main channel, its binding can allosterically close the RNAP clamp, thereby preventing its nonspecific DNA binding and PTC formation. Taken together, we propose that RapA acts as a guardian of RNAP by which RapA prevents nonspecific DNA binding of RNAP without affecting the binding of promoter DNA recognition σ factor, thereby enhancing RNAP recycling.


  • Organizational Affiliation

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


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit alpha
A, B
237Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoAFAZ83_23195
EC: 2.7.7.6
UniProt
Find proteins for P0A7Z4 (Escherichia coli (strain K12))
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UniProt GroupP0A7Z4
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit beta1,340Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoBFAZ83_22375
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'1,363Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoCFAZ83_22370
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 omega91Escherichia coli K-12Mutation(s): 0 
Gene Names: rpoZb3649JW3624
EC: 2.7.7.6
UniProt
Find proteins for P0A800 (Escherichia coli (strain K12))
Explore P0A800 
Go to UniProtKB:  P0A800
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UniProt GroupP0A800
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Entity ID: 5
MoleculeChains LengthOrganismImage
DNA (29-MER)F [auth N]29Escherichia coli K-12
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Entity ID: 6
MoleculeChains LengthOrganismImage
RNA (20-MER)G [auth R]11Escherichia coli K-12
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Entity ID: 7
MoleculeChains LengthOrganismImage
DNA (29-MER)H [auth T]29Escherichia coli K-12
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.15 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 Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM087350
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35 GM131860

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-02
    Type: Initial release
  • Version 1.1: 2021-12-15
    Changes: Database references
  • Version 1.2: 2021-12-22
    Changes: Database references
  • Version 1.3: 2024-05-29
    Changes: Data collection