Abstract: Provided are a method for enhancing the production quantity of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(3HB-co-3HH)) having a high fraction of 3-hydroxyhexanoate (3HH) using a saccharide or glycerol as a starting material; a method for producing a P(3HB-co-3HH) copolymer including performing transformation by homologous recombination of a crotonyl-CoA reductase gene in a chromosome of a recombinant strain of Cupriavidus necator endowed with the ability to produce P(3HB-co-3HH), or performing transformation by introducing an autonomous replication vector in which the crotonyl-CoA reductase gene is incorporated in the aforementioned strain, and cultivating the transformant in a medium containing a saccharide or glycerol as a carbon source; and a method for enhancing the production quantity of the copolymer and/or the fraction of 3HHx in the copolymer.

Abstract: The purpose of the present invention is to provide a method for enhancing the production quantity of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(3HB-co-3HH)) having a high fraction of 3-hydroxyhexanoate (3HH) using a saccharide or glycerol as a starting material. The present invention provides: a method for producing a P(3HB-co-3HH) copolymer including performing transformation by homologous recombination of a crotonyl-CoA reductase gene in a chromosome of a recombinant strain of Cupriavidus necator endowed with the ability to produce P(3HB-co-3HH), or performing transformation by introducing an autonomous replication vector in which the crotonyl-CoA reductase gene is incorporated in the aforementioned strain, and cultivating the transformant in a medium containing a saccharide or glycerol as a carbon source; and a method for enhancing the production quantity of the copolymer and/or the fraction of 3HHx in the copolymer.

Abstract: An object of the present invention is to provide a method for producing poly(3-hydroxybutyrate-co-3-hydroxyhexanoate (P(3HB-co-3HHx)) having a high 3-hydroxyhexanoate fraction using a vegetable oil as a basic raw material. According to the present invention, a method is provided for producing P(3HB-co-3HHx) having a high 3-HHx fraction using a vegetable oil as a basic raw material by disrupting and so forth at least one gene encoding 2-enoyl-CoA hydratase or at least one gene encoding 3-hydroxyacyl-CoA dehydrogenase on a chromosome of a recombinant Cupriavidus necator strain imparted with the ability to produce P(3HB-co-3HHx).

Abstract: The present invention intends to produce poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HHx)] with a high 3-hydroxyhexanoic acid fraction using a vegetable oil as a basic raw material. In accordance with the present invention, there is provided a method of producing a microorganism that produces poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) with a high 3-hydroxyhexanoic acid fraction using a vegetable oil as a basic raw material, by introducing a gene encoding R-hydratase that converts a fatty acid ?-oxidation system intermediate to a monomer, (R)-3-hydroxyacyl-CoA [R-3HA-CoA], into a recombinant Cupriavidus necator strain that was conferred an ability of producing P(3HB-co-3HHx).