Abstract
1. 1. The specific activities of homogenous AMP-deaminases isolated from rat, rabbit, hen, frog and perch skeletal muscle increased during storage at 4°C up to 2 weeks. A longer storage caused gradual decrease of activity. 2. 2. No change of specific activity was observed during storage of the enzymes from human and pikeperch skeletal muscle and from frog liver. 3. 3. The absorbancy ratio A 280/A 260 was in the range 1–2 for each enzyme studied, being stable during storage of a given enzyme preparation. 4. 4. Limited proteolysis with trypsin resulted in a significant increase of activity of AMP-deaminase in crude extracts of rat muscle and hen white as well as red muscles. 5. 5. Upon trypsin treatment the specific activity of AMP-deaminase purified from rat muscle increased while negligible activity increase with the enzymes purified from hen white and red muscles was observed.
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