By Alton Meister
A continual authoritative sequence reviewing study into enzymology and comparable parts of molecular biology. provides six papers through top professionals.
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Additional resources for Advances in Enzymology and Related Areas of Molecular Biology, Volume 55
Vulgaris with [2-'4C]malonyl CoA, 4-coumaroyl CoA, and NADH or NADPH generating systems only resulted in formation of labeled naringenin (XXV)(1 14). Plants synthesize fatty acids via a type I1 (nonaggregated) FAS system. It is interesting to speculate that, in addition to the similarity between 6'-hydroxy CHS and pketoacyl-ACP synthetase, the 6'-deoxy CHS might make use of two further activities which are very similar to the separate pketoacyl-ACP dehydrogenase and 0-hydroxyacyl-ACP dehydratase of type I1 FAS.
Glycinea) elicitors, and pulsechase experiments allowed the calculation of a half-life for glyceollin of 100 hr with either elicitor (226). It was therefore concluded that rates of glyceollin accumulation are mainly regulated via elicitor effects on phytoalexin synthesis. Studies on the metabolism of exogenously added phaseollin by Phaseolus vulgaris, coupled with results indicating the synthesis of phaseollin in living cells and its ultimate accumulation in neighboring, dead cells (221,227), have led to the proposal that phytoalexin turnover may have an important physiological role in protecting the cells that initially synthesize the phytoalexin from its phytotoxic action.
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.