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A novel mouse mitochondrial voltage-dependent anion channel gene localizes to chromosome 8
M J Sampson1, R S Lovell, D B Davison
1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.
Abstract:
Voltage-dependent anion channels (VDACs) are small pore-forming channels found in the outer membrane of mitochondria. VDACs translocate adenine nucleotides and are the binding sites for several cytosolic kinases important in intermediary metabolism. Recently two human VDAC cDNAs (HVDAC1 and HVDAC2) were isolated, and possible orthologues of these genes have been isolated from mouse, bovine, and rat tissues. We report the isolation of a novel third VDAC cDNA from the mouse, designated MVDAC3. The deduced MVDAC3 protein is approximately 70% identical to the previously isolated MVDAC1 and MVDAC2 proteins. The MVDAC3 gene was mapped by an interspecies backcross panel to mouse chromosome 8. A database search using the mouse VDACs identified a second yeast VDAC-like gene that retains about 20% amino acid sequence identity with the mouse VDAC genes and 50% identity with the previously isolated yeast VDAC gene. The phylogenetic relationship of the eukaryotic VDAC genes is presented.
Insights
Researchers discovered a new mouse gene, MVDAC3, encoding a voltage-dependent anion channel (VDAC). This finding expands the known VDAC family and aids in understanding mitochondrial function and evolution.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Voltage-dependent anion channels (VDACs) are crucial pore-forming proteins in the mitochondrial outer membrane.
- VDACs facilitate the transport of adenine nucleotides and interact with kinases involved in metabolism.
- Previous studies identified human VDACs (HVDAC1, HVDAC2) and related genes in other mammals.
Purpose of the Study:
- To report the isolation and characterization of a novel third mouse VDAC cDNA, MVDAC3.
- To determine the evolutionary relationships of VDAC genes across species.
Main Methods:
- Isolation and sequencing of the MVDAC3 cDNA.
- Bioinformatic analysis to compare MVDAC3 with known VDAC proteins.
- Gene mapping of MVDAC3 using an interspecies backcross panel.
- Database searches to identify homologous VDAC-like genes in yeast.
Main Results:
- A novel mouse VDAC cDNA, MVDAC3, was isolated.
- The deduced MVDAC3 protein shares approximately 70% identity with MVDAC1 and MVDAC2.
- MVDAC3 was mapped to mouse chromosome 8.
- A second yeast VDAC-like gene was identified, showing significant sequence identity to mouse VDACs.
Conclusions:
- The discovery of MVDAC3 expands the known repertoire of mouse VDACs.
- Phylogenetic analysis provides insights into the evolutionary history of eukaryotic VDAC genes.
- This research contributes to a deeper understanding of VDAC function in mitochondria and metabolism.