Download Advances in Enzymology and Related Areas of Molecular by Alton Meister PDF

By Alton Meister

A continual authoritative sequence reviewing examine into enzymology and comparable parts of molecular biology. offers six papers by way of major specialists.


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Read or Download Advances in Enzymology and Related Areas of Molecular Biology, Volume 55 PDF

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Additional resources for Advances in Enzymology and Related Areas of Molecular Biology, Volume 55

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The complex contains 4-phosphopantetheine (174), and is very similar to the type I (aggregated) FAS from yeast and from P. patulum itself (1 75); an NADPH-dependent reduction, and subsequent dehydration, of the enzyme-bound polyketide occurs at the triacetic acid level prior to the final condensation with malonyl CoA (168,174). A similar type of mechanism for 6'-deoxy chalcone formation has been deduced from a study of the incorporation pattern of [I3C]acetate into the A ring of the pterocarpan phytoalexin pisatin (XI) in Pisum sativum (176) and into the A ring of phaseollin (XIII) in Phaseolirs vulgaris (162).

The realization of the involvement of terpenoids in the biochemical defense mechanisms of plants against fungal infection arose from the pioneering work of Muller and Borger (1,2) on the interaction of potato cultivars with Phyfophfhora infesfuns. 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).

Lindemuthianum have all been shown to bring about the 6a-hydroxylation of medicarpin (231) (Scheme 12), the two latter fungi also hydroxylating phaseollin in this position (240) (Scheme 13c); 6a-hydroxylation by Colletotrichum species may also be followed by hydroxylation at the 7 position (240) (Schemes 12 and 13). The appearance of 6a,7dihydroxy medicarpin (LV) only after a period 50 hr in C. coffeanum-infected leaves of MeIiIotus alba, whereas the 6a-hydroxy derivative (LVI) appears by 25 hr, suggests that C.

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