Wound-Induced Increase in 1-Aminocyclopropane-1-Carboxylate Synthase Activity: Regulatory Aspects and Membrane Association of the Enzyme
Abstract
The demonstration of 1-aminocyclopropane-1-carboxylic acid (ACC) as an immediate precursor of ethylene biosynthesis in higher plants (1,2) and of enzymatic conversion of S-adenosylmethionine (SAM) to ACC by cell-free extracts of tomato fruit (3) established the following metabolic sequence:
Methionine → SAM → ACC → ethylene
The conversion of SAM to ACC in vivo appears to be one of the main, rate limiting steps in ethylene biosynthesis. This is apparent from observations showing stimulation of ethylene production as being linked to concomitant increase in the endogenous levels of ACC (4). Thus, studies aimed at understanding the regulation of the ACC synthesizing enzyme (ACC synthase) are of much current interest. The tissue which, on wounding, consistently yields a markedly increased activity of ACC synthase is tomato fruit (3–5). The mechanism that underlies this marked increase in extractable ACC synthase activity is not understood, although wounding seems to initiate the synthesis of new proteins and discrete translatable mRNA’s (Mattoo A.K., Anderson, J.D. Nakhasi, H.L, 1983, unpublished data).
Keywords
Ethylene Production Tomato Fruit Ethylene Biosynthesis Osmotic Shock Soybean Trypsin InhibitorPreview
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Literature Cited
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