Abstract
1. 1. Similar activity of AMP deaminase was found in rat, hen, turtle and flounder liver when estimated at high AMP concentration. The enzyme activity was of an order of magnitude higher in frog liver. 2. 2. Simple step by step phosphocellulose column chromatography revealed two forms of AMP deaminase in chicken and flounder liver and one form in the liver of rat and turtle. 3. 3. All enzymes (except for frog liver AMP deaminase) were activated by ATP. The enzymes from rat, frog and both forms from flounder were also activated by ADP. 4. 4. GTP exhibited a variety of effects. The enzyme from rat and turtle was inhibited, both forms from hen and flounder were activated and frog liver enzyme was not influenced.
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