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. 1994 Apr;60(4):1198–1205. doi: 10.1128/aem.60.4.1198-1205.1994

Production of polyhydroxyalkanoates in sucrose-utilizing recombinant Escherichia coli and Klebsiella strains.

H Zhang 1, V Obias 1, K Gonyer 1, D Dennis 1
PMCID: PMC201459  PMID: 8017916

Abstract

The cloned poly-3-hydroxybutyrate (PHB) synthesis pathway from Alcaligenes eutrophus has been introduced into sucrose-utilizing strains of Escherichia coli, Klebsiella aerogenes, and Klebsiella oxytoca. The plasmid-borne genes were well expressed in these environments and were able to mediate the production of significant amounts of PHB when the bacteria were grown with sucrose as the sole carbon source. The molecular weight of the PHB polymer made in K. aerogenes and E. coli was approximately 1 x 10(6) to 2 x 10(6). Sucrose uptake in K. aerogenes was measured and found to be similar to that found for other Klebsiella strains, but sucrose uptake in the E. coli strain was not detectable. K. aerogenes is able to utilize sugarcane molasses as the sole carbon source to accumulate PHB at the rate of approximately 1 g of PHB per liter of culture fluid per h. A K. oxytoca fadR strain was able to incorporate 3-hydroxyvalerate into a poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-co-V) polymer to levels as high as 56 mol% when grown in a medium containing propionate. Total PHB-co-V levels could be enhanced by adding propionate at the beginning of stationary phase rather than at the time of inoculation.

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Selected References

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