Abstract
An enzyme, apyrase, obtained from thermophile No. 2184 possesses heat stability at 65 °C., the temperature preferred by the organism for growth. Apyrase from the thermophile has an activation energy of 9600 cal./ mole. Its Michaelis constant is 0.00065 at 60 °C. The enzyme is inhibited by fluoride, citrate, and copper, but is activated by magnesium. Apyrase from a mesophilic bacterium, although possessing a fair amount of stability in the presence of substrate, does not have the resistance to heat possessed by the thermophile enzyme. The apyrase from potato is inactivated readily on heating in the absence of adenosine triphosphate.
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