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Enolase isozymes in Coho salmon
S R Landrey1, R Applegate, J M Cardenas
1Department of Biochemistry & Biophysics, Oregon State University, Corvallis 97331.
Summary
Coho salmon enolase exhibits six distinct forms across tissues, with variations suggesting unique gene origins. These enolases can be purified and renatured, highlighting their complex genetic basis.
Area of Science:
- Biochemistry
- Molecular Biology
- Fisheries Science
Background:
- Enolase is a crucial enzyme in glycolysis.
- Isozymes of enolase play vital roles in cellular metabolism and have been studied in various species.
Purpose of the Study:
- To analyze the distribution and characteristics of enolase isozymes in Coho salmon tissues.
- To investigate the genetic basis of enolase diversity in salmonids.
Main Methods:
- Electrophoretic separation of enolase isozymes on cellulose acetate strips.
- Localization of enzymatic activity to identify distinct forms.
- Partial purification and characterization of enolase from muscle and liver tissues.
- Analysis of reversible denaturation and renaturation in guanidine hydrochloride.
Main Results:
- Six electrophoretically distinct enolase forms were identified in Coho salmon.
- Isozymic patterns varied qualitatively and quantitatively between tissues (skeletal muscle, liver).
- Coho salmon muscle enolase has an isoelectric point of 7.57.
- Both muscle and liver enolases demonstrated reversible denaturation and renaturation, with liver enolase renaturing slightly faster.
Conclusions:
- Tissue-specific enolase isozymic patterns indicate the presence of distinct, nonallelic genes, likely arising from gene duplication.
- While polyploidy may contribute to complexity, gene duplication is a primary driver of enolase diversity in Coho salmon.
- The findings contribute to understanding enzyme evolution and genetic regulation in fish.