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A Pseudomonas strain accumulating polyesters of 3-hydroxybutyric acid and medium-chain-length 3-hydroxyalkanoic acids

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Summary

A citronellol-utilizing bacterium was isolated that accumulated a polyester consisting of 3-hydroxybutyric acid (3HB) and of medium-chain-length 3-hydroxyalkanoic acids (3HAMCL) from various carbon sources up to approximately 70% of the cellular dry matter if the cells were cultivated in ammineral salts medium under nitrogen limitation. In octanoate-grown cells, for instance, the polyester consisted of 87.5 mol% 3HB and 12.5 mol% 3-hydroxyoctanoic acid (3HO), whereas it consisted of 10.3 mol% 3HB, 16.7 mol% 3HO and 73.0 mol% 3-hydroxydecanoic acid (3HD) in gluconate-grown cells. However, the results of various experiments indicated that a blend rather than a copolyester was synthesized in the cell. It was the only strain among 45 different recently isolated citronellol-utilizing bacteria that accumulated such a polyester. All other citronellol-utilizing bacteria behaved like Pseudomonas aeruginosa with respect to their polyhydroxyalkanoic acid (PHA) biosynthetic capabilities and accumulated PHA consisting of 3HAMCL with 3HO and 3HD as the main constituents from octanoate or gluconate, respectively, whereas 3HB was never present. None of 232 different heavy-metal-resistant bacteria was able to accumulate PHA composed of 3HB plus, for example, 3HO. Only 20.3% did not accumulate any PHA at all, 44.8% accumulated PHB from gluconate, and 34.9% behaved like P. aeruginosa. Many bacteria belonging to the latter group were distinguished from the other by rapid growth in nutrient broth and in gluconate mineral salts medium and by their ability to grow in the presence of a high concentration (up to 1.5%, w/v) of octanoate.

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Authors and Affiliations

  1. Institut für Mikrobiologie der Georg-August-Universität Göttingen, Grisebachstrasse 8, W-3400, Göttingen, Federal Republic of Germany

    Alexander Steinbüchel & Stefan Wiese

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  1. Alexander Steinbüchel
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  2. Stefan Wiese
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Correspondence to: A. Steinbüchel

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Steinbüchel, A., Wiese, S. A Pseudomonas strain accumulating polyesters of 3-hydroxybutyric acid and medium-chain-length 3-hydroxyalkanoic acids. Appl Microbiol Biotechnol 37, 691–697 (1992). https://doi.org/10.1007/BF00174829

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  • DOI: https://doi.org/10.1007/BF00174829

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