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A rat gene encoding heart 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase
M I Darville1, M Chikri, E Lebeau
1Hormone and Metabolic Research Unit, International Institute of Cellular and Molecular Pathology, Brussels, Belgium.
FEBS Letters
|August 19, 1991
Summary
Researchers identified and compared rat genes for 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase isozymes. Gene structures differ, suggesting distinct regulatory domains in heart, liver, and muscle isozymes.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFKFB) is a bifunctional enzyme.
- PFKFB catalyzes both synthesis and degradation of fructose 2,6-bisphosphate.
- At least three PFKFB isozymes exist, with distinct tissue distributions.
Purpose of the Study:
- To identify and characterize the rat gene encoding the heart PFKFB isozyme.
- To compare the heart PFKFB gene structure with previously described liver and muscle PFKFB genes.
- To investigate the structural basis for regulatory differences among PFKFB isozymes.
Main Methods:
- Gene identification and sequencing.
- Comparative gene structure analysis.
- Exon-intron boundary determination.
Main Results:
- A 22-kb rat gene for the heart PFKFB isozyme was identified.
- This gene was compared to the 55-kb rat genes for liver and muscle PFKFB isozymes.
- Both genes share 12 similar exons but possess distinct terminal exons.
Conclusions:
- The distinct terminal exons suggest different regulatory domains at the N- and C-termini of the PFKFB isozymes.
- Structural variations in PFKFB genes correlate with functional and regulatory differences.
- This study provides insight into the molecular basis of PFKFB isozyme diversity.