46 results about "PHA synthase" patented technology

The gene encoding a 4-hydroxybutyryl-CoA transferase has been isolated from bacteria and integrated into the genome of bacteria also expressing a polyhydroxyalkanoate synthase, to yield an improved production process for 4HB-containing polyhydroxyalkanoates using transgenic organisms, including both bacteria and plants. The new pathways provide means for producing 4HB containing PHAs from cheap carbon sources such as sugars and fatty acids, in high yields, which are stable. Useful strains are obtaining by screening strains having integrated into their genomes a gene encoding a 4HB-CoA transferase and / or PHA synthase, for polymer production. Processes for polymer production use recombinant systems that can utilize cheap substrates. Systems are provided which can utilize amino acid degradation pathways, α-ketoglutarate, or succinate as substrate.

Organisms are provided which express enzymes such as glycerol dehydratase, diol dehydratase, acyl-CoA transferase, acyl-CoA synthetase β-ketothiolase, acetoacetyl-CoA reductase, PHA synthase, glycerol-3-phosphate dehydrogenase and glycerol-3-phosphatase, which are useful for the production of PHAs. In some cases one or more of these genes are native to the host organism and the remainder are provided from transgenes. These organisms produce poly (3-hydroxyalkanoate) homopolymers or co-polymers incorporating 3-hydroxypropionate or 3-hydroxyvalerate monomers wherein the 3-hydroxypropionate and 3-hydroxyvalerate units are derived from the enzyme catalysed conversion of diols. Suitable diols that can be used include 1,2-propanediol, 1,3 propanediol and glycerol. Biochemical pathways for obtaining the glycerol from normal cellular metabolites are also described. The PHA polymers are readily recovered and industrially useful as polymers or as starting materials for a range of chemical intermediates including 1,3-propanediol, 3-hydroxypropionaldehyde, acrylics, malonic acid, esters and amines.

The invention discloses an engineering strain and application thereof to production of long-chain 3-hydroxy fatty acid. The engineering strain provided by the invention is a recombinant strain obtained by conducting the following modification on a starting strain: (a) inactivation of a PHA synthase gene; and (b) introduction of a thioesterase gene. The starting strain is bacteria producing polyhydroxyalkanoates. hen the engineering strain provided by the invention is used, and a middle to long-chain fatty acid is used as a single carbon source, a 3-hydroxy fatty acid product with high yield, high purity, and a structure highly consistent with that of the provided fatty acid carbon source can be obtained in a fermentation liquid. The method provided by the invention can be used for production of 3-hydroxy fatty acid with high yield and high purity, and has wide application prospect.

The present invention provides a microorganism that synthesizes a high-molecular-weight PHA, and a method for producing a high-molecular-weight PHA, which have a productivity of at least 100 g / L. The provision is achieved by controlling the specific activity of a PHA synthase in cells of a microorganism that belongs to the genus Cupriavidus and is capable of producing a PHA, to 0.1 U / mg-protein at most. The microorganism and the method enable industrially efficient production of a PHA with a weight average molecular weight of at least 4,000,000.

A PHA copolymer which is slowly crystallized is improved in crystallization speed to improve the melt workability of the PHA copolymer in working such as injection molding, film molding, blow molding, fiber spinning, extrusion foaming or bead foaming, thereby improving the resultant articles in productivity. A method for the improvement is a method for producing a PHA mixture, including the step of culturing a microorganism having both of a gene encoding a PHA synthase that synthesizes a copolymer PHA (A) and that is derived from the genus Aeromonas, and a gene encoding a PHA synthase that synthesizes a PHA (B) different in melting point from the copolymer PHA (A) by 10° C. or more to produce, in a cell of the microorganism, two or more PHAs different in melting point from one another by 10° C. or more simultaneously.

The present invention relates to polyhydroxyalkanoate synthase (PHA synthase) mutant originated from Pseudomonas sp. 6-19 (KCTC 11027BP) which can prepare lactate polymer and / or copolymer by using lactyl-CoA as a substrate. The present invention relates to a method for preparing lactate polymer and / or copolymer with the synthase mutant. The polyhydroxyalkanoate synthase mutants of the present invention originated from Pseudomonas sp. 6-19 can efficiently prepare lactate polymer and / or copolymer by using as a substrate lactyl-CoA which is difficult to be used as a substrate by conventional polyhydroxyalkanoate synthase.