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Antibiotic production, accumulation of intracellular carbon reserves, and sporulation in Micromonospora echinospora (ATCC 15837)

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The physiology of the actinomycete Micromonospora echinospora was examined during growth. Biphasic accumulation of glycogen occurred, initially during the early exponential growth phase, and again following the onset of sporulation at 120 h. Lipid levels increased during growth eventually representing 25% of the cell mass. A significant proportion of the lipid was found to be in the form of triacylglycerols, which were found to accumulate markedly during the sporulation phase. The disaccharide trehalose was also found to accumulate during growth with levels rising to 5% of the dry weight during the mycelial production phase, then remaining constant during sporulation. Antibiotic was produced transiently by the cultures over the period preceding sporulation.Key words: Micromonospora, glycogen, trehalose, lipids, triacylglycerol.

La physiologie du l'actinomycète Micromonospora echinospora a été examinée pendant sa croissance. Pendant celle-ci, il se produisit une accumulation biphasique de glycogène, d'abord au cours de la phase précoce de croissance exponentielle, puis de nouveau à la suite du déclenchement de la sporulation à 120 heures. Les niveaux de lipides ont augmenté au cours de la croissance pour constituer éventuellement 25% de la masse cellulaire. Une proportion significative des lipides fut retrouvée sous la forme de triacylglycérols, qui ont démontré une nette accumulation lors de la phase de sporulation. Le tréhalose, un disaccharide, s'est également accumulé pendant la croissance, avec des taux atteignant 5% du poids sec pendant la phase de production mycéliale, pour ensuite demeurer constants pendant la sporulation. De l'antibiotique a été produit transitoirement par les culture durant la période précédant la sporulation.Mots clés : Micromonospora, glycogène, tréhalose, lipides, triacylglycérol.[Traduit par la Rédaction]

Keywords: Micromonospora; glycogen; glycogène; lipides; lipids; trehalose; triacylglycerol; triacylglycérol; tréhalose

Document Type: Research Article

Publication date: 2001-02-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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