Biosynthesis of ethylene. Formation of ethylene from methional by a cell-free enzyme system from cauliflower florets

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Abstract
The formation of ethylene from cauliflower florets is stimulated by the addition of either methionine or its hydroxy analogue. Formation of ethylene from these compounds may also be demonstrated in call-free extracts, but the most rapid formation is achieved by the addition of methional. Fractionation of such extracts has shown that both particulate and non-particulate fractions are necessary for the forma-tion of ethylene from methionine or its hydroxy analogues, but only the non-particulate fraction is necessary for its formation from me-thional. A study of this system has shown that the conversion of methional into ethylene requires the presence of 2 enzyme systems, the 1st generating peroxide and the 2nd catalyzing the conversion of methional into ethylene in the presence of peroxide. The presence of a heat-stable factor in cauliflower extracts that is necessary for the full activity of the enzyme converting methional into ethylene has also been shown. The nature of this factor is at the present unknown; it is not a metal nor is it identifiable with many of the known coenzymes.

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