Abstract
1. Acetylcholinesterase activity of Naja naja naja, Naja melanoleuca and Bungarus fasciatus venoms is due to mixtures of isoenzymes. 2. Naja melanoleuca venom has two acetylcholinesterase isozymes and both Naja naja naja and Bungarus fasciatus venoms have four acetylcholinesterase isozymes that are resolved by disc gel electrophoresis. 3. With isoelectric focusing, Naja melanoleuca venom was found to have eight acetylcholinesterase isozymes with pI values ranging from 4.2 to 5.2, while Bungarus fasciatus venom had ten isozymes with pI values from 4.3 to 5.3. 4. The results of disc gel electrophoresis and ion exchange chromatography indicate that these isozymes differ in charge. 5. Gel permeation chromatography of acetylcholinesterase of Naja melanoleuca and Bungarus fasciatus venoms indicated that the isozymes of each venom all have a common molecular weight.
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