Temperature-dependence of fish muscle AMP-aminohydrolase

Makarewicz, W. (1968) Temperature-dependence of fish muscle AMP-aminohydrolase. Journal of the Marine Biological Association of the United Kingdom, 48 (2). pp. 535-542.

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Abstract

The effect of temperature on the rate of reaction catalysed by crude muscle AMP-aminohydrolase from two species of elasmobranch and two species of teleost fish has been investigated at low substrate concentration in the range of temperature 5-50 °C. The enzyme from teleost fish shows a very broad temperature optimum around 30°C. The reaction rate of the enzyme from elasmobranch fish is strongly dependent on temperature. The optimum temperature for the enzyme from thornback ray lies around 40°C. Both crude and 500-fold purified AMP-aminohydrolase from thornback ray show the same temperature-dependence. The activity of the AMP-aminohydrolase in the muscle extracts of four species of fish has been compared. The mechanism of the temperature dependence of an enzyme reaction as well as some biological implications of the differences observed between different animals are discussed.

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