6ERP

Structure of the human mitochondrial transcription initiation complex at the LSP promoter


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.502 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.270 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural Basis of Mitochondrial Transcription Initiation.

Hillen, H.S.Morozov, Y.I.Sarfallah, A.Temiakov, D.Cramer, P.

(2017) Cell 171: 1072-1081.e10

  • DOI: 10.1016/j.cell.2017.10.036
  • Primary Citation of Related Structures:  6ERO, 6ERQ

  • PubMed Abstract: 
  • Transcription in human mitochondria is driven by a single-subunit, factor-dependent RNA polymerase (mtRNAP). Despite its critical role in both expression and replication of the mitochondrial genome, transcription initiation by mtRNAP remains poorly u ...

    Transcription in human mitochondria is driven by a single-subunit, factor-dependent RNA polymerase (mtRNAP). Despite its critical role in both expression and replication of the mitochondrial genome, transcription initiation by mtRNAP remains poorly understood. Here, we report crystal structures of human mitochondrial transcription initiation complexes assembled on both light and heavy strand promoters. The structures reveal how transcription factors TFAM and TFB2M assist mtRNAP to achieve promoter-dependent initiation. TFAM tethers the N-terminal region of mtRNAP to recruit the polymerase to the promoter whereas TFB2M induces structural changes in mtRNAP to enable promoter opening and trapping of the DNA non-template strand. Structural comparisons demonstrate that the initiation mechanism in mitochondria is distinct from that in the well-studied nuclear, bacterial, or bacteriophage transcription systems but that similarities are found on the topological and conceptual level. These results provide a framework for studying the regulation of gene expression and DNA replication in mitochondria.


    Organizational Affiliation

    Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcription factor A, mitochondrial
C, G
205Homo sapiensGene Names: TFAM (TCF6, TCF6L2)
Find proteins for Q00059 (Homo sapiens)
Go to Gene View: TFAM
Go to UniProtKB:  Q00059
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase, mitochondrial
A, B
1128Homo sapiensGene Names: POLRMT
EC: 2.7.7.6
Find proteins for O00411 (Homo sapiens)
Go to Gene View: POLRMT
Go to UniProtKB:  O00411
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Dimethyladenosine transferase 2, mitochondrial
F, J
377Homo sapiensGene Names: TFB2M (NS5ATP5)
EC: 2.1.1.-
Find proteins for Q9H5Q4 (Homo sapiens)
Go to Gene View: TFB2M
Go to UniProtKB:  Q9H5Q4
Entity ID: 2
MoleculeChainsLengthOrganism
Non-Template DNAD,H50Homo sapiens
Entity ID: 3
MoleculeChainsLengthOrganism
Template DNAE,I50Homo sapiens
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.502 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.270 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 103.910α = 90.00
b = 197.030β = 99.87
c = 137.210γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
Cootmodel building
PHENIXphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
German Research FoundationGermanySFB860
German Research FoundationGermanySPP1935
European Research CouncilGermany693023
Volkswagen FoundationGermany--
National Institutes of HealthUnited StatesRO1 GM104231
Boehringer Ingelheim FondsGermanyPhD Student Fellowship

Revision History 

  • Version 1.0: 2017-11-15
    Type: Initial release
  • Version 1.1: 2017-11-29
    Type: Database references
  • Version 1.2: 2018-01-24
    Type: Source and taxonomy
  • Version 1.3: 2018-01-31
    Type: Author supporting evidence