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Genomic structure of mouse copper chaperone, COX17
Y Takahashi1, K Kako, K Ohmura
1Institute of Applied Biochemistry, University of Tsukuba, Ibaraki, Japan.
DNA Sequence : the Journal of DNA Sequencing and Mapping
|March 27, 2002
Summary
Researchers cloned the mouse COX17 gene, identifying its promoter region and key transcription factor binding sites. This work advances understanding of copper metabolism and cytochrome c oxidase assembly in mammals.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Cytochrome c oxidase (COX) is crucial for cellular respiration.
- Copper chaperone COX17 (Cox17p) is vital for COX assembly.
- Mammalian homologues of yeast Cox17p are suggested by recent research.
Purpose of the Study:
- To clone and characterize the mouse COX17 gene.
- To identify the promoter region of the mouse COX17 gene.
- To investigate the transcriptional regulation of mouse COX17.
Main Methods:
- Cloning of mouse COX17 gene fragments.
- Radiation hybrid mapping to determine chromosomal location.
- 5'-RACE analysis for transcription start site identification.
- Transient transfection assays with reporter plasmids.
- Sequence analysis of the 5'-flanking region.
Main Results:
- Mouse COX17 gene cloned, spanning ~6kb with three exons.
- Mapped to the center of chromosome 16.
- Identified the major transcription start site 80 bp upstream of ATG.
- Localized the essential promoter to a 0.8 kb region upstream of the transcription start site.
- Found GC-rich segments with Sp1 binding sites, but no TATA/CAAT boxes.
- Identified binding sites for NRF-1 and NRF-2 near the transcription start site.
Conclusions:
- The mouse COX17 gene has been successfully cloned and characterized.
- The core promoter region and key regulatory elements have been identified.
- This provides a foundation for understanding COX17's role in mammalian copper homeostasis and COX assembly.