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Sequence of a cDNA clone encoding pig heart mitochondrial CoA transferase
1Department of Biochemistry, University of Alberta, Edmonton, Canada.
The Journal of Biological Chemistry
|January 15, 1992
Summary
Researchers isolated a pig heart mitochondrial CoA transferase cDNA clone, crucial for ketone body metabolism. The study details its amino acid sequence, mitochondrial targeting, and identifies a proteolytic cleavage site suggesting a two-domain protein structure.
Area of Science:
- Biochemistry
- Molecular Biology
- Metabolic Pathways
Background:
- Mitochondrial CoA transferase (succinyl-CoA:3-ketoacid coenzyme A transferase) is vital for ketone body catabolism.
- Understanding the structure and function of this enzyme is key to metabolic research.
Purpose of the Study:
- To isolate and characterize the full-length cDNA clone encoding pig heart mitochondrial CoA transferase.
- To elucidate the protein's structure, including its signal sequence, mature protein size, and potential folding domains.
Main Methods:
- Isolation of a full-length cDNA clone.
- Deduction of amino acid sequence from the cDNA.
- Analysis of the deduced sequence for signal peptides and potential structural features.
Main Results:
- A full-length cDNA clone for pig heart mitochondrial CoA transferase was successfully isolated.
- The deduced protein sequence includes a 39-residue mitochondrial signal sequence and a 481-residue mature protein (52,197 MW).
- The site of proteolytic cleavage was identified, suggesting a two-domain structure connected by a hydrophilic bridge.
Conclusions:
- The cloned cDNA provides a molecular tool for studying pig heart mitochondrial CoA transferase.
- The identified structural features, including the signal sequence and cleavage site, offer insights into enzyme targeting and activation.
- The proposed two-domain structure may explain the enzyme's susceptibility to proteolysis while maintaining activity.