A comparison of some properties of myocardial phosphofructokinase from the rainbow trout ( Salmo gairdneri) and the diving turtle ( Pseudemys scripta)

1. 1. Kinetic properties of myocardial PFK of relevance to Pasteur effect were compared in turtle and trout at 25°C. 2. 2. Turtle heart PFK is less inhibited by citrate and ATP than the myocardial PFK of trout. 3. 3. At pH 7.4 and high ATP concentrations AMP increases the activity of the myocardial...

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Published inComparative biochemistry and physiology. B, Comparative biochemistry Vol. 70; no. 1; pp. 161 - 164
Main Author Jensen, Gunnar SøgÅrd
Format Journal Article
LanguageEnglish
Published Elsevier Inc 1981
Subjects
animal physiology
aquatic organisms
Freshwater
Marine
Pseudemys scripta
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Summary:1. 1. Kinetic properties of myocardial PFK of relevance to Pasteur effect were compared in turtle and trout at 25°C. 2. 2. Turtle heart PFK is less inhibited by citrate and ATP than the myocardial PFK of trout. 3. 3. At pH 7.4 and high ATP concentrations AMP increases the activity of the myocardial PFK of turtle while it inhibits that of trout. At pH below 7.1 AMP activates the PFK of trout. 4. 4. The myocardial PFK of turtle is activated by both NH 4 + and P i while that of trout is activated only by P i. 5. 5. The results suggest that the myocardial PFK of turtle is adapted to produce a several-fold increase in the glycolytic flux during hypoxia while that of trout is adapted to a production of pyruvate for the citric acid cycle.
Bibliography:ObjectType-Article-1
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ISSN:0305-0491
DOI:10.1016/0305-0491(81)90137-1