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Polyhydroxyalkanoates production by actinobacteria isolated from soil

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Polyhydroxyalkanoates (PHAs) are biodegradable and renewable polymers produced by a wide range of bacterial groups. New microbial bioprospection approaches have become an important way to find new PHA producers and new synthesized polymers. Over the past years, bacteria belonging to actinomycetes group have become known as PHA producers, such as Nocardia and Rhodococcus species, Kineosphaera limosa Liu et al. 2002, and, more recently, Streptomyces species. In this paper, we disclose that there are more actinobacteria PHA producers in addition to the genera cited. Some unusual genera, such as Streptoalloteichus, and some genera frequently present in soil, such as Streptacidiphilus, have been found. Thirty-four isolates were able to accumulate poly(3-hydroxybutyrate) and a number of these have traces of poly(3-hydroxyvalerate) when cultivated on glucose or glucose and casein as carbon source. Furthermore, some strains showed traces of medium chain length PHA. Transmission electron microscopy demonstrated that the PHA accumulation occurs in hyphae and spores.

Les polyhydroxyalkanoates (PHAs) sont des polymères biodégradables et renouvelables produits par une vaste gamme de groupes bactériens. Les nouvelles approches de bioprospection microbienne sont devenues des moyens importants pour trouver de nouveaux producteurs de PHA et de nouveaux polymères synthétisés. Au cours des dernières années, les bactéries appartenant aux groupes des actinomycètes ont été reconnues comme productrices de PHA, telles les espèces de Nocardia et Rhodococcus, Kineosphaera limosa Liu et al. 2002 et les espèces de Streptomyces. Dans cet article, nous révélons qu’il existe davantage de producteurs de PHA chez les actinobactéries en plus des genres cités. Des genres peu communs, comme Streptoalloteichus, et d’autres genres fréquemment présents dans le sol, comme Streptacidiphilus, ont été trouvés. Trente-quatre isolats ont accumulé le poly(3-hydroxybutyrate) et un certain nombre d’entre eux accumulaient des traces de poly(3-hydroxyvalérate) lorsqu’ils étaient cultivés sur du glucose ou sur du glucose et de la caséine comme sources de carbone. Qui plus est, quelques souches montraient des traces de PHA de longueur de chaîne moyenne. La microscopie électronique à transmission a démontré que l’accumulation de PHA se produit dans les hyphes et les spores.

Document Type: Research Article

Publication date: 2009-07-01

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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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