Gibberellin Biosynthesis in gib Mutants of Gibberella fujikuroi(∗)

The Ascomycete Gibberella fujikuroi synthesizes gibberellins, fujenal, carotenoids, and other terpenoids. Twelve gib mutants, isolated through the modified gibberellin fluorescence of their culture media, were subjected to chemical and biochemical analyses. Two mutants were specifically defective in...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:The Journal of biological chemistry 1995-06, Vol.270 (25), p.14970-14974
Hauptverfasser: Fernández-Martn, Rafael, Reyes, Fernando, Domenech, Carlos E., Cabrera, Eduardo, Bramley, Peter M., Barrero, Alejandro F., Avalos, Javier, Cerdá-Olmedo, Enrique
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The Ascomycete Gibberella fujikuroi synthesizes gibberellins, fujenal, carotenoids, and other terpenoids. Twelve gib mutants, isolated through the modified gibberellin fluorescence of their culture media, were subjected to chemical and biochemical analyses. Two mutants were specifically defective in the hydroxylation of carbon 13; their total gibberellin production was normal, but their main gibberellin was GA7 instead of GA3. Four mutants were blocked in the early reactions between geranylgeranyl pyrophosphate and 7-hydroxykaurenoic acid; two of them could not synthesize kaurene and another one was blocked in several oxidative steps. Six mutants had partial defects in early reactions, leading to the production of one-fifth to one-third of the wild type amounts of gibberellins and fujenal. Two of these produced considerable amounts of kaurenolides due to a defect in the conversion of kaurenoic acid to 7-hydroxykaurenoic acid. Another one produced no carotenoids, but attempts to isolate mutants of reactions shared by the carotenoid and gibberellin pathways failed. The gib mutations did not modify the ability of the fungus to live as a saprophyte.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.270.25.14970