Related Experiment Video
Updated: May 20, 2026
Preparation of Mitochondrial Enriched Fractions for Metabolic Analysis in Drosophila
Published on: September 30, 2015
D-MTERF5 is a novel factor modulating transcription in Drosophila mitochondria
Francesco Bruni1, Caterina Manzari, Mariacristina Filice
1Dipartimento di Bioscienze, Biotecnologie e Scienze Farmacologiche, Università degli Studi di Bari Aldo Moro, Via Orabona 4, 70125 Bari, Italy.
Abstract:
The MTERF protein family comprises members from Metazoans and plants. All the Metazoan MTERF proteins characterized to date, including the mitochondrial transcription termination factors, play a key role in mitochondrial gene expression. In this study we report the characterization of Drosophila MTERF5 (D-MTERF5), a mitochondrial protein existing only in insects, probably originated from a duplication event of the transcription termination factor DmTTF. D-MTERF5 knock-down in D.Mel-2 cells alters transcript levels with an opposite pattern to that produced by DmTTF knock-down. D-MTERF5 is able to interact with mtDNA at the same sites contacted by DmTTF, but only in the presence of the termination factor. We propose that the two proteins participate in the transcription termination process, with D-MTERF5 engaged in relieving the block exerted by DmTTF. This hypothesis is supported also by D-MTERF5 homology modeling, which suggests that this protein contains protein-protein interaction domains. Co-regulation by DREF (DNA Replication-related Element binding Factor) of D-MTERF5 and DmTTF implies that expression of the two factors needs to be co-ordinated to ensure fine modulation of Drosophila mitochondrial transcription.
Insights
Drosophila MTERF5 (D-MTERF5), a unique insect mitochondrial protein, interacts with DNA and likely modulates transcription termination. It works alongside DmTTF, suggesting coordinated roles in regulating mitochondrial gene expression.
Area of Science:
- Mitochondrial gene expression
- Molecular biology
- Protein interactions
Background:
- The MTERF protein family is crucial for mitochondrial gene expression in Metazoans and plants.
- Mitochondrial transcription termination factors (DmTTF) are key regulators of mitochondrial gene expression.
Purpose of the Study:
- To characterize Drosophila MTERF5 (D-MTERF5), a novel insect-specific MTERF protein.
- To elucidate the role of D-MTERF5 in Drosophila mitochondrial transcription.
Main Methods:
- Knock-down experiments in D.Mel-2 cells.
- DNA-protein interaction studies.
- Homology modeling of D-MTERF5.
- Analysis of DREF co-regulation.
Main Results:
- D-MTERF5 knock-down resulted in transcript level changes opposite to DmTTF knock-down.
- D-MTERF5 binds to mtDNA at sites occupied by DmTTF, but requires DmTTF presence.
- Homology modeling suggests D-MTERF5 possesses protein-protein interaction domains.
- D-MTERF5 and DmTTF are co-regulated by DREF.
Conclusions:
- D-MTERF5 and DmTTF likely collaborate in mitochondrial transcription termination.
- D-MTERF5 may act to relieve transcription blocks imposed by DmTTF.
- Coordinated expression of D-MTERF5 and DmTTF is essential for fine-tuning Drosophila mitochondrial transcription.
More Related Videos
09:20Analyzing Mitochondrial Function in a Drosophila melanogaster PINK1B9-Null Mutant Using High-resolution Respirometry
Published on: November 10, 2023
14:55Measurement of Mitochondrial Oxygen Consumption in Permeabilized Fibers of Drosophila Using Minimal Amounts of Tissue
Published on: April 7, 2018
Related Concept Videos
02:23Master Transcription Regulators
01:19Translocation of Proteins into the Mitochondria
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,...