Mitochondrial DNA dependent RNA polymerase homodimer.

Experimental Data Snapshot

  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Non-coding 7S RNA inhibits transcription via mitochondrial RNA polymerase dimerization.

Zhu, X.Xie, X.Das, H.Tan, B.G.Shi, Y.Al-Behadili, A.Peter, B.Motori, E.Valenzuela, S.Posse, V.Gustafsson, C.M.Hallberg, B.M.Falkenberg, M.

(2022) Cell 185: 2309

  • DOI: https://doi.org/10.1016/j.cell.2022.05.006
  • Primary Citation of Related Structures:  
    7PZP, 7PZR, 7ZC4

  • PubMed Abstract: 

    The mitochondrial genome encodes 13 components of the oxidative phosphorylation system, and altered mitochondrial transcription drives various human pathologies. A polyadenylated, non-coding RNA molecule known as 7S RNA is transcribed from a region immediately downstream of the light strand promoter in mammalian cells, and its levels change rapidly in response to physiological conditions. Here, we report that 7S RNA has a regulatory function, as it controls levels of mitochondrial transcription both in vitro and in cultured human cells. Using cryo-EM, we show that POLRMT dimerization is induced by interactions with 7S RNA. The resulting POLRMT dimer interface sequesters domains necessary for promoter recognition and unwinding, thereby preventing transcription initiation. We propose that the non-coding 7S RNA molecule is a component of a negative feedback loop that regulates mitochondrial transcription in mammalian cells.

  • Organizational Affiliation

    Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany; Institute of Biochemistry, University of Cologne, Zülpicher Str. 47, 50674 Cologne, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase, mitochondrial
A, B
1,211Homo sapiensMutation(s): 0 
Gene Names: POLRMT
UniProt & NIH Common Fund Data Resources
Find proteins for O00411 (Homo sapiens)
Explore O00411 
Go to UniProtKB:  O00411
PHAROS:  O00411
GTEx:  ENSG00000099821 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00411
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-09-28
    Type: Initial release
  • Version 1.1: 2022-10-05
    Changes: Database references