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This investigation provides direct evidence that rat pineal gland contains ATP:L‐methionine S ‐adenosyltransferase. The specific activity of the enzyme is about 25 times greater than that of hydroxyindole‐ O ‐methyltransferase, the unique marker enzyme in this tissue. The major product of the reaction catalyzed by ATP:L‐methionine S ‐adenosyltransferase has been identified as S ‐adenosyl‐methionine which can function as a methyl group donor for the formation of melatonin. The specific activity of pineal ATP:L‐methionine S ‐adenosyltransferase is at least eight times greater than that of brain, and one‐half that of the liver enzyme.
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Guchhait et al. (1978) studied this question.
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