Related Experiment Video

Updated: Jun 24, 2026

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
05:52

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

The MTERF family proteins: mitochondrial transcription regulators and beyond

Marina Roberti1, Paola Loguercio Polosa, Francesco Bruni

  • 1Dipartimento di Biochimica e Biologia Molecolare Ernesto Quagliariello, Università degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy.

Biochimica Et Biophysica Acta
|April 16, 2009
PubMed

Insights

The MTERF protein family regulates mitochondrial DNA transcription and replication. Understanding these factors is key to unraveling mitochondrial gene expression mechanisms.

Area of Science:

  • Mitochondrial biology
  • Molecular genetics
  • Protein families

Background:

  • The MTERF (Mitochondrial Transcription Termination Factor) family comprises 4 subfamilies (MTERF1-4) found in Metazoa and plants.
  • These proteins are localized in mitochondria and feature a modular structure with repeating mTERF motifs containing leucine zipper-like heptads.
  • Known MTERF members include transcription termination factors like human mTERF, sea urchin mtDBP, and Drosophila DmTTF.

Purpose of the Study:

  • To investigate the diverse roles of the MTERF protein family beyond transcription termination.
  • To explore the involvement of MTERF factors in mitochondrial transcription initiation and mtDNA replication control.
  • To elucidate the complete function of MTERF family members in understanding mitochondrial gene expression.

Main Methods:

  • In vitro and in vivo studies were employed to analyze MTERF protein functions.
  • Specific studies focused on the human and Drosophila MTERF3 factor to understand its regulatory role.

Main Results:

  • MTERF family proteins exhibit functions beyond transcription termination, including roles in transcription initiation and mtDNA replication.
  • Human and Drosophila MTERF3 were identified as negative regulators of mitochondrial transcription, potentially acting with other factors.
  • Functional diversity may correlate with variations in mitochondrial genome organization.

Conclusions:

  • The MTERF protein family plays multifaceted roles in mitochondrial gene expression.
  • Further research on MTERF family members is crucial for a complete understanding of mitochondrial DNA transcription and replication.
  • Elucidating MTERF functions will contribute to unraveling complex molecular mechanisms of mitochondrial genetics.

More Related Videos

Rapid Isolation of the Mitoribosome from HEK Cells09:33

Rapid Isolation of the Mitoribosome from HEK Cells

Published on: October 4, 2018

Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly09:53

Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly

Published on: June 7, 2024

Related Concept Videos

Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Co-activators and Co-repressors02:04

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...