Action of tryptophan analogues in Saccharomyces cerevisiae View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1977-12

AUTHORS

Giuseppe Miozzari, Peter Niederberger, Ralf Hütter

ABSTRACT

In an analysis of the effects of various tryptophan and indole analogues in Saccharomyces cerevisiae we determined the mechanisms by which they cause growth inhibition:4-Methyltryptophan causes a reduction in protein synthesis and a derepression of the tryptophan enzymes despite of the presence of high internal levels of tryptophan. This inhibition can only be observed in a mutant with increased permeability to the analogue. These results are consistent with but do not prove an interference of this analogue with the charging of tryptophan onto tRNA.5-Methyltryptophan causes false feedback inhibition of anthranilate synthase, the first enzyme of the tryptophan pathway. This inhibits the further synthesis of tryptophan and results in results in tryptophan limitation, growth inhibition and derepression of the enzymes. Derepression eventually allows wild type cells to partially overcome the inhibitory effect of the analogue.5-Fluoroindole is converted endogenously to 5-fluorotryptophan by tryptophan synthase. Both endogenous and externally supplied 5-fluorotryptophan are incorporated into protein. This leads to intoxication of the cells due to the accumulation of faulty proteins. 5-Fluorotryptophan also causes feedback inhibition of anthranilate synthase and reduces the synthesis of tryptophan which would otherwise compete with the analogues in the charging reaction.Indole acrylic acid inhibits the conversion of indole to tryptophan by tryptophan synthase. This results in a depletion of the tryptophan pool which, in turn, causes growth inhibition and derepression of the tryptophan enzymes. More... »

PAGES

307-316

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00446457

DOI

http://dx.doi.org/10.1007/bf00446457

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1016782871

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/341826


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