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Biosynthesis of multi-component polyhydroxyalkanoates by the bacterium Wautersia eutropha [Text] / T. G. Volova, G. S. Kalacheva, A. . Steinbuchel // Macromol. Symp. - 2008. - Vol. 269: 4th European Symposium on Biopolymers (OCT 02-04, 2007, Kusadasi, TURKEY). - P1-7, DOI 10.1002/masy.200850901. - Cited References: 20 . - 7. - ISSN 1022-1360

РУБ Polymer Science
Рубрики:
RALSTONIA-EUTROPHA
   ALCALIGENES-EUTROPHUS
   AEROMONAS-HYDROPHILA
   ENHANCED PRODUCTION
   PHA SYNTHASE
   COPOLYESTERS
   POLY(3-HYDROXYBUTYRATE-CO-3-HYDROXYHEXANOATE)
   3-HYDROXYBUTYRATE
   ACID
Кл.слова (ненормированные):
autotrophic and mixotrophic growth -- multi-component polyhydroxyalkanoates -- Wautersia eutropha
Аннотация: The study addresses the effect of different conditions of carbon nutrition on synthesis of polyhydroxyalkanoates by the bacterium Wautersia eutropha. In experiments with two wild type strains (H16 and 85786), it has been first found that under mixotrophic growth conditions -CO2+ co-substrate (alkanoic acids) - bacteria can synthesize multi-component PHAs, consisting of short- and medium-chain-length monomers with carbon chains containing 4 to 8 atoms. It has been shown that PHA composition is determined by the type of the co-substrate. Fatty acids with odd number of carbons induce bacteria to synthesize four- and five-component PHAs with hydroxybutyrate, hydroxyvalerate as major monomers and hydroxyhexanoate, hydroxyheptanoate and hydroxyoctanoate as minor, occasionally occurring, ones. Fatty acids with even number of carbons induce synthesis of not only their respective monomers (hydroxyhexanoate and hydroxyoctanoate) but also hydroxyvalerate, making possible synthesis of four-component PHAs, containing hydroxybutyrate and hydroxyhexanoate as major components (up to 18 mol%). A family of short- and medium-chain-length four- and five-component PHAs were synthesized and their physicochemical properties examined.

Держатели документа:
[Volova, Tatiana G.
Kalacheva, Galina S.] Inst Biophys SB RAS, Krasnoyarsk 660036, Russia
[Volova, Tatiana G.] Siberian Fed Univ, Krasnoyarsk, Russia
[Steinbuechel, Alexander] Inst Mol Microbiol & Biotechnol, Munster, Germany : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Volova, T.G.; Kalacheva, G.S.; Steinbuchel, A...

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Autotrophic synthesis of polyhydroxyalkanoates by the bacteria Ralstonia eutropha in the presence of carbon monoxide [Text] / T. G. Volova, G. S. Kalacheva, O. V. Altukhova // Appl. Microbiol. Biotechnol. - 2002. - Vol. 58, Is. 5. - P. 675-678, DOI 10.1007/s00253-002-0941-8. - Cited References: 35 . - ISSN 0175-7598

РУБ Biotechnology & Applied Microbiology
Рубрики:
PSEUDOMONAS-OLEOVORANS
   ALCALIGENES-EUTROPHUS
   COAL
   CULTIVATION
   METABOLISM
   SUBSTRATE
   CULTURE
   CO2
   H-2
   O-2
Аннотация: It has been found that the carbon monoxide (CO)-resistant strain of the hydrogen bacteria Ralstonia eutropha B5786 is able to synthesise polyhydroxyalkanoates (PHAs) in the presence of CO under autotrophic conditions. This strain, grown on model gas mixtures containing 5-25% CO v/v), accumulates up to 70-75% (of absolutely dry matter) PHA, without significant variation in the yield coefficient on hydrogen. No suppression of the activities of the key enzymes of PHA synthesis (beta-ketothiolase, acetoacetyl-CoA-reductase, butyrate dehydrogenase and poly-3-hydroxybutyrate synthase) was recorded. The PHA synthesised is a copolymer containing mostly beta-hydroxybutyrate (more than 99 mol%) with trace amounts of beta-hydroxyvalerate. The investigated properties of the polymer (molecular weight, crystallinity, temperature characteristics) do not differ from those of the polymer synthesised on electrolytic hydrogen.

WOS
Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Volova, T.G.; Kalacheva, G.S.; Altukhova, O.V.

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Microbial Degradation of Polyhydroxyalkanoates with Different Chemical Compositions and Their Biodegradability / T. G. Volova [et al.] // Microb. Ecol. - 2017. - Vol. 73, Is. 2. - P353-367, DOI 10.1007/s00248-016-0852-3. - Cited References:65. - This study was supported by the Russian Science Foundation (Grant No. 14-26-00039). . - ISSN 0095-3628. - ISSN 1432-184X

РУБ Ecology + Marine & Freshwater Biology + Microbiology
Рубрики:
TROPICAL COASTAL WATERS
PHA-DEGRADING BACTERIA
ALCALIGENES-EUTROPHUS
Кл.слова (ненормированные):
Degradable polyhydroxyalkanoates -- PHA -- Soil -- PHA-degrading -- microorganisms
Аннотация: The study addresses degradation of polyhydroxyalkanoates (PHA) with different chemical compositions-the polymer of 3-hydroxybutyric acid [P(3HB)] and copolymers of P(3HB) with 3-hydroxyvalerate [P(3HB/3HV)], 4-hydroxybutyrate [P(3HB/4HB)], and 3-hydroxyhexanoate [P(3HB/3HHx)] (10-12 mol%)-in the agro-transformed field soil of the temperate zone. Based on their degradation rates at 21 and 28 A degrees C, polymers can be ranked as follows: P(3HB/4HB) > P(3HB/3HHx) > P(3HB/3HV) > P(3HB). The microbial community on the surface of the polymers differs from the microbial community of the soil with PHA specimens in the composition and percentages of species. Thirty-five isolates of bacteria of 16 genera were identified as PHA degraders by the clear zone technique, and each of the PHA had both specific and common degraders. P(3HB) was degraded by bacteria of the genera Mitsuaria, Chitinophaga, and Acidovorax, which were not among the degraders of the three other PHA types. Roseateles depolymerans, Streptomyces gardneri, and Cupriavidus sp. were specific degraders of P(3HB/4HB). Roseomonas massiliae and Delftia acidovorans degraded P(3HB/3HV), and Pseudoxanthomonas sp., Pseudomonas fluorescens, Ensifer adhaerens, and Bacillus pumilus were specific P(3HB/3HHx) degraders. All four PHA types were degraded by Streptomyces.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Biophys, Akademgorodok 50-50, Krasnoyarsk, Russia.

Доп.точки доступа:
Volova, Tatiana G.; Prudnikova, Svetlana V.; Vinogradova, Olga N.; Syrvacheva, Darya A.; Shishatskaya, Ekaterina I.; Russian Science Foundation [14-26-00039]

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