By Alton Meister
A continual authoritative sequence reviewing learn into enzymology and comparable parts of molecular biology. offers six papers by means of prime professionals.
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Extra info for Advances in Enzymology and Related Areas of Molecular Biology, Volume 55
A . DIXON, P. M. DEY, AND C. J. LAMB Small amounts of product prenylated at C 4 were also detected [corresponding to the major glyceollin isomer I (XIV)]. The significance of the proportions of C-2 and C-4 prenylation, and the number of transferases involved, remains to be elucidated. C. DEGRADATION OF ISOFLAVONOID PHYTOALEXINS 1. Host Metabolism Many of the phenolic compounds which accumulate in plants are not simply end products of metabolism, but can be further metabolized by degradation and/or polymerization (21 5,216).
Formation of an isoflavone via a chalcone epoxide. 9- 011 , ~ N w Scheme 7. Formation of an isoflavone via a spirodienone intermediate. I 0 PHYTOALEXINS: ENZYMOLOGY AND MOLECULAR BIOLOGY 33 Another model, again based on chemical oxidation analogies, involves the intermediacy of a spirodienone intermediate (195). This model (Scheme 7) has several attractive features; in particular, it explains the requirement, in chemical studies, for a free 2- or 4-hydroxyl group (chalcone numbering) on the migrating aryl unit.
Among the known phytoalexins that can be classified as terpenes are sesquiterpenoids, diterpenoids, triterpenoids, and possibly some steroidderived glycoalkaloids. The poly-isoprene carbon skeletons of terpenes provide the biosynthetic flexibility of varying chain-length and chainfolding patterns, thus offering a wide variety of structurally related products (248). It seems unlikely, therefore, that only a single terpenoid phytoalexin would be responsible for resistance of a plant exposed to a 50 R.
Advances in Enzymology and Related Areas of Molecular Biology, Volume 55 by Alton Meister