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  • Title: Regulation of phenylalanine ammonia-lyase synthesis by cinnamic acid. Its implication for the light mediated regulation of the enzyme.
    Author: Johnson C, Attridge T, Smith H.
    Journal: Biochim Biophys Acta; 1975 Mar 14; 385(1):11-9. PubMed ID: 1125257.
    Abstract:
    1. There is an increase in the extractable acitivity of phenylalanine ammonia-lyase following excision of hypocotyl segments of dark-grown gherkin seedlings This increase is prevented by the reaction product, cinnamin acid. 2. Density-labelling experiments show that cinnamic acid affects the rate of enzyme synthesis. By contrast the regulation of phenylalanine ammonia-lyase activity by light has previously been shown to involve activation of existing inactive enzyme. 3. It is proposed that regulation of synthesis by reaction products represents a mechanism for controlling the size of the pool of phenylalanine ammonia-lyase, and that the activity of this pool is regulated by light.
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