摘要:
Provided is a method of preparing polylactate (PLA) or a copolymer thereof using a mutant microorganism in which a gene participating in a coenzyme A (CoA) donor- and lactate-producing pathway is genetically manipulated to increase the productivity of a CoA donor and lactate. Amounts of the CoA donor and the lactate are simultaneously increased in a microbial metabolic pathway to enable effective biosynthesis of PLA and a hydroxyalkanoate-lactate copolymer having a high content of lactate, which is industrially useful.
摘要:
There is provided a recombinant microorganism having producibility of poly(lactate-co-glycolate) from glucose, and more particularly, a recombinant microorganism having producibility of poly(lactate-co-glycolate) without adding an exogenous glycolate precursor, and a method of preparing [poly(preparing lactate-co-glycolate)] using the same. According to the present invention, the poly(lactate-co-glycolate) in which the concentration of the glycolate fraction is high may be prepared at a high concentration without supplying exogenous glyoxylate. Therefore, the present invention may be effectively used for treatment.
摘要:
A method of synthesizing optically-active (S)-3-hydroxybutyric acid and (S)-3-hydroxybutyrate ester using a mutated microorganism is provided. More particularly, a mutated microorganism for preparing (S)-3-hydroxybutyric acid transformed with a gene encoding β-ketothiolase, a gene encoding (S)-3-hydroxybutyryl CoA dehydrogenase and a gene encoding acyl CoA hydrolase; a method of preparing (S)-3-hydroxybutyric acid using the mutated microorganism; a mutated microorganism for preparing (S)-3-hydroxybutyrate ester transformed with a gene encoding β-ketothiolase, a gene encoding (S)-3-hydroxybutyryl CoA dehydrogenase, a gene encoding acyl CoA hydrolase and a gene encoding lipase; and a method of preparing (S)-3-hydroxybutyrate ester using the mutated microorganism are provided.Accordingly, (S)-3-hydroxybutyric acid with high optical purity may be produced from acetyl CoA produced in glycolysis of a microorganism by a simple process involving the manipulation of a metabolic pathway by a recombinant gene introduced into the microorganism without using a high-cost metal catalyst or a substrate. Further, (S)-3-hydroxybutyrate ester and lactone of (S)-3-hydroxybutyrate ester may be simply produced from (S)-3-hydroxybutyric acid produced by the above method using lipase.
摘要:
Provided are a recombinant Ralstonia eutropha capable of producing polylactate or a hydroxyalkanoate-lactate copolymer, and a method of preparing polylactate or a hydroxyalkanoate-lactate copolymer using the same. The recombinant Ralstonia eutropha, which is prepared by introducing a gene of an enzyme converting lactate into lactyl-CoA and a gene of a polyhydroxyalkanoate (PHA) synthase using lactyl-CoA as a substrate thereto, may be cultured, thereby efficiently preparing a lactate polymer and a lactate copolymer.
摘要:
Provided are a microorganism capable of producing a polylactate (PLA) or PLA copolymer from sucrose and a method of producing the PLA or PLA copolymer from sucrose using the same. A gene of an enzyme converting lactate into lactyl-CoA and a gene of a polyhydroxyalkanoate (PHA) synthase using lactyl-CoA as a substrate are introduced into a microorganism capable of using sucrose as a substrate, and the microorganism is cultured using sucrose as the substrate, thereby allowing efficient production of a PLA or PLA copolymer.
摘要:
A mutant capable of producing 1,4-butanediol and a method of preparing 1,4-butanediol using the same are provided. The mutant microorganism is prepared by introducing and amplifying genes encoding enzymes converting succinate into 4-hydroxybutyrate and 4-hydroxybutyrate into 1,4-butanediol in a microorganism capable of producing succinate. The method includes culturing the mutant in a medium containing carbohydrate and obtaining 1,4-butanediol from the culture. Thus, 1,4-butanediol, which is essential in chemical industry, can be prepared in a biological process.
摘要:
Provided are a recombinant microorganism capable of producing polylactate (PLA) or hydroxyalkanoate-lactate copolymers and a method of preparing PLA or hydroxyalkanoate-lactate copolymers using the same. The recombinant microorganism has both a gene encoding a propionyl-CoA transferase from Megasphaera elsdenii and a gene encoding a polyhydroxyalkanoate (PHA) synthase using lactyl-CoA as a substrate.A propionyl-CoA transferase from Megasphaera elsdenii is introduced into the recombinant microorganism to effectively provide lactyl-CoA, thereby enabling efficient preparation of PLA or PLA copolymers.
摘要:
The present invention relates to cells or plants that can produce polylactate or its copolymers and to a method for preparing polylactate or its copolymers using the same. More specifically, cells or plants with the ability to produce polylactate or hydroxyalkanoate-lactate copolymers comprise both a gene encoding an enzyme that converts lactate into lactyl-CoA and a gene encoding polyhydroxyalkanoate (PHA) synthase which uses lactyl-CoA as a substrate. Also described is a method for preparing polylactate or hydroxyalkanoate-lactate copolymers which comprises culturing the cells in a medium containing lactate or lactate and various hydroxyalkanoates or culturing the plants. Effective preparation of hydroxyalkanoate-lactate copolymer which comprises various hydroxyalkanoates as well as polylactate, using the cells or the plants, is disclosed.
摘要:
A novel Rhodococcus-E. coli shuttle vector comprising an origin of replication of a novel plasmid derived from Rhodococcus erythropolis IAM1484 and an origin of replication derived from E. coli, is disclosed. This shuttle vector replicates bidirectionally in E. coli and Rhodococcus. Also disclosed is a recombinant vector in which a target gene is operably linked to the shuttle vector, and microorganisms transformed with the recombinant vector. The shuttle vector is relatively small in size, can replicate in a variety of species of the genus Rhodococcus and has high replication stability in a host cell. Therefore, this shuttle vector is useful for cloning a variety of genes.
摘要:
The present invention relates to cells or plants that can produce polylactate or its copolymers and to a method for preparing polylactate or its copolymers using the same. More specifically, cells or plants with the ability to produce polylactate or hydroxyalkanoate-lactate copolymers comprise both a gene encoding an enzyme that converts lactate into lactyl-CoA and a gene encoding polyhydroxyalkanoate (PHA) synthase which uses lactyl-CoA as a substrate. Also described is a method for preparing polylactate or hydroxyalkanoate-lactate copolymers which comprises culturing the cells in a medium containing lactate or lactate and various hydroxyalkanoates or culturing the plants. Effective preparation of hydroxyalkanoate-lactate copolymer which comprises various hydroxyalkanoates as well as polylactate, using the cells or the plants, is disclosed.