Summary
Exogenous supplies of phenylalanne, cinnamic acid and p-coumaric acid can inhibit the appearance of phenylalanine ammonia-lyase (PAL, E.C. 4.3.1.5) activity in potato tuber discs, and exogenous supplies of cinnamic acid and p-coumaric acid can inhibit the appearance of cinnamic acid 4-hydroxylase (CA4H, E.C. 1.14.13.11) activity. The time-courses of the inhibitory effects of (a) exogenous phenylalanine on the appearance of PAL activity and (b) exogenous cinnamic acid on the appearance of CA4H activity suggest that the respective substrates of the two enzymes have no inhibitory effects per se, but rather that metabolic derivatives are the active agents. Accordingly, cinnamic acid and p-coumaric acid, but not phenylalanine can inhibit the initial appearance of PAL activity. Similarly, p-coumaric acid but not cinnamic acid can inhibit the initial appearance of CA4H activity. The inhibitory effects of exogenous cinnamic acid and p-coumaric acid on the initial appearance of PAL activity are independent. These findings are discussed in relation to the control in vivo of the levels of activity of PAL and CA4H.
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Abbreviations
- PAL:
-
phenylalanine ammonia-lyase
- CA4H:
-
cinnamic acid 4-hydroxylase
References
Camm, E.L., Towers, G.H.N.: Phenylalanine ammonia-lyase, a review. Phytochemistry 12, 961–973 (1973)
Creasy, L.L.: Role of phenylalanine in the biosynthesis of flavonoids and cinnamic acids in strawberry leaf discs. Phytochemistry 10, 2705–2711 (1971)
Engelsma, G.: Photoinduction of phenylalanine deaminase in gherkin seedlings. III Effects of excision and irradiation on enzyme development in hypocotyl segments. Planta (Berl.) 82, 355–368 (1968)
Engelsma, G.: A comparative investigation of phenylalanine ammonialyase in gherkin and red cabbage hypocotyls. Acta Bot. Neerl. 19, 403–409 (1970)
Engelsma, G.: A possible role of divalent manganese ions in the photoinduction of phenylalanine ammonia-lyase. Plant Physiol. 50, 599–602 (1972)
Engelsma, G.: Induction of Phenylalanine ammonia-lyase by dichlobenil in gherkin seedlings. Acta Bot. Neerl. 22, 49–54 (1974)
Engelsma, G.: On the mechanism of the changes in phenylalanine ammonia-lyase activity induced by ultraviolet and blue light in gherkin hypocotyls. Plant Physiol. 54, 702–705 (1975)
Gelboin, H.V., Wiebel, F.J., Kinoshita, N.: Microsomal aryl hydrocarbon hydroxylase: On their role in polycyclic hydrocarbon carcinogenesis and toxicity and mechanism of enzyme induction. In Biological Hydroxylation Mechanisms, Biochem. Soc. Symp. vol. 34, pp. 103–134, Boyd, G.S., Smellie, R.M.S. eds. New York-London: Academic Press 1971
Goldstein, L.D., Jennings, P.H., Marsh, H.V. Jnr.: Phenylalanine ammonia-lyase activity in asparagus spears: effects of excision and incubation. Plant and Cell Physiol. 13, 783–793 (1972)
Johnson, C., Attridge, T., Smith, H.: Regulation of phenylalanine ammonia-lyase synthesis by cinnamic acid: Its implications for the light mediated regulation of the enzyme. Biochim. Biophys. Acta 385, 11–19 (1975)
Koukol, J., Conn, E.E.: The metabolism of aromatic compounds in higher plants. IV Purification and properties of the phenylalanine deaminase of Hordeum vulgare. J. Biol. Chem. 236, 2692–2698 (1961)
Lamb, C.J., Rubery, P.H.: A spectrophotometric assay for cinnamic acid 4-hydroxylase. Anal. Biochem. 68, 554–561 (1975)
Lamb, C.J., Rubery, P.H.: Photocontrol of chlorogenic acid biosynthesis in potato tuber discs. Phytochemistry in press (1976a)
Lamb, C.J., Rubery, P.H.: Inhibition of cooperative enzymes by substrate-analogues: Possible implications for the physiological significance of negative cooperativity illustrated by phenylalanine metabolism in higher plants. J. Theor. Biol. in press (1976b)
Lamb, C.J., Rubery, P.H.: Interpretation of the rate of density labelling of enzymes with deuterium oxide. Possible implications for the mode of action of phytochrome. Biochim. Biophys. Acta in press (1976c)
Potts, J.R.M., Weklych, R., Conn, E.E.: The 4-hydroxylation of cinnamic acid by Sorghum microsomes and the requirement for cytochrome P-450. J. Biol. Chem. 249, 5019–5026 (1974)
Russell, D.W.: The metabolism of aromatic compounds in higher plants. X Properties of the cinnamic acid 4-hydroxylase of pea seedlings and some aspects of its metabolic and developmental control. J. Biol. Chem. 246, 3870–3878 (1971)
Zucker, M.: Induction of phenylalanine deaminase by light and its relation to chlorogenic acid synthesis in potato tuber tissue. Plant Physiol. 40, 779–788 (1965)
Zucker, M.: Sequential induction of phenylalanine ammonia-lyase and a lyase-inactivating system in potato tuber disks. Plant Physiol. 43, 365–374 (1968)
Zucker, M.: Light and Enzymes. Ann. Rev. Plant Physiol. 22, 133–156 (1972)
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Lamb, C.J., Rubery, P.H. Phenylalanine ammonia-lyase and cinnamic acid 4-hydroxylase: Product repression of the level of enzyme activity in potato tuber discs. Planta 130, 283–290 (1976). https://doi.org/10.1007/BF00387834
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DOI: https://doi.org/10.1007/BF00387834