Jan 1, 1976

Physiological study of ergot: induction of alkaloid synthesis by tryptophan at the enzymatic level

Journal of Bacteriology
V M KrupinskiH G Floss


The enhancement of ergot alkaloid production by tryptophan and its analogues in both normal and high-phosphate cultures is more directly related to increased dimethylallyltryptophan (DMAT) synthetase activity rather than to a lack of regulation of the tryptophan biosynthetic enzymes. Thiotryptophan [beta-(1-benzo-thien-3-yl)-alanine] is rather ineffective in the end product regulation of tryptophan biosynthesis, whereas tryptophan and 5-methyltryptophan are potent effectors. The presence of increased levels of DMAT synthetase in ergot cultures supplemented with tryptophan or thiotryptophan, and to a lesser extent with 5-methyltryptophan, suggests that the induction effect involves de novo synthesis of the enzyme. Thiotryptophan and tryptophan but not 5-methyltryptophan can overcome the block of alkaloid synthesis by inorganic phosphate. The results with thiotryptophan indicate that the phosphate effect cannot be explained merely on the basis of a block of tryptophan synthesis.

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Mentioned in this Paper

Tryptophan Synthase
Myopathy, Distal, With Anterior Tibial Onset
2-Dehydro-3-Deoxyphosphoheptonate Aldolase
Ergot Alkaloids
Enzyme Induction
Anthranilate Synthase Component I
Cell-Free System

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