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. 1986 Nov;168(2):947–952. doi: 10.1128/jb.168.2.947-952.1986

Glucose represses formation of delta-(L-alpha-aminoadipyl)-L-cysteinyl-D-valine and isopenicillin N synthase but not penicillin acyltransferase in Penicillium chrysogenum.

G Revilla, F R Ramos, M J López-Nieto, E Alvarez, J F Martín
PMCID: PMC213576  PMID: 3096965

Abstract

The content of alpha-aminoadipyl-cysteinyl-valine, the first intermediate of the penicillin biosynthetic pathway, decreased when Penicillium chrysogenum was grown in a high concentration of glucose. Glucose repressed the incorporation of [14C]valine into alpha-aminoadipyl-cysteinyl-[14C]valine in vivo. The pool of alpha-aminoadipic acid increased sevenfold in control (lactose-grown) penicillin-producing cultures, coinciding with the phase of rapid penicillin biosynthesis, but this increase was very small in glucose-grown cultures. Glucose stimulated homocitrate synthase and saccharopine dehydrogenase activities in vivo and increased the incorporation of lysine into proteins. These results suggest that glucose stimulates the flux through the lysine biosynthetic pathway, thus preventing alpha-aminoadipic acid accumulation. The repression of alpha-aminoadipyl-cysteinyl-valine synthesis by glucose was not reversed by the addition of alpha-aminoadipic acid, cysteine, or valine. Glucose also repressed isopenicillin N synthase, which converts alpha-aminoadipyl-cysteinyl-valine into isopenicillin N, but did not affect penicillin acyltransferase, the last enzyme of the penicillin biosynthetic pathway.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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