Abstract
An enzyme, extracted from the outermost cell layers of wound-healing potato tuber discs, has been shown to transfer ferulic acid from feruloyl-CoA to ω-hydroxypalmitic acid. p-Coumaroyl-CoA and sinapoyl-CoA also acted as substrates but were less active than feruloyl-CoA. Good correlation was found between the development of the enzymic activity and the accumulation of alkali-soluble ferulic acid in the suberized cell walls. This transferase (hydroxycinnamoyl-CoA: ω-hydroxypalmitic acid O-hydroxycinnamoyltransferase, HHT, EC 2.3.1.—) could be involved in suberin biosynthesis. Several 1-alkanols were also conjugated to ferulic acid in crude enzymic extracts of wound-healing potato tuber discs. Maximal activity was obtained with 1-tetradecanol, suggesting that ω-hydroxypalmitic acid and 1-tetradecanol could be conjugated by distinct enzymes.
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