A novel modified polypeptide having an isopropylmalate synthase activity, a polynucleotide encoding the same, a microorganism including the polypeptide, and a method of producing L-leucine by culturing the microorganism.

The invention relates to a 2-isopropyl malate synthase, a genetically engineered bacterium for producing L-leucine and application thereof and belongs to the field of metabolic engineering. The genetically engineered bacterium is obtained by overexpressing an isopropyl malate synthase coding gene leuA.sup.M for relieving feedback inhibition by L-leucine, an acetohydroxy acid synthase coding gene ilvBN.sup.M for relieving feedback inhibition by L-isoleucine, a 3-isopropyl malate dehydrogenase coding gene leuB and a 3-isopropyl malate dehydratase coding gene leuCD in host cells. The genetically engineered bacterium for producing the L-leucine is free from nutritional deficiency, rapid in growth, short in fermentation period, high in yield and high in conversion rate.

The invention relates to a 2-isopropyl malate synthase, a genetically engineered bacterium for producing L-leucine and application thereof and belongs to the field of metabolic engineering. The genetically engineered bacterium is obtained by overexpressing an isopropyl malate synthase coding gene leuA.sup.M for relieving feedback inhibition by L-leucine, an acetohydroxy acid synthase coding gene ilvBN.sup.M for relieving feedback inhibition by L-isoleucine, a 3-isopropyl malate dehydrogenase coding gene leuB and a 3-isopropyl malate dehydratase coding gene leuCD in host cells. The genetically engineered bacterium for producing the L-leucine is free from nutritional deficiency, rapid in growth, short in fermentation period, high in yield and high in conversion rate.

Genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD enzyme complexes), microbial organisms including genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD), and processes for preparing C.sub.7-C.sub.11 2-ketoacids with genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD). The genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD enzyme complexes), microbial organisms, and processes for preparing C.sub.7-C.sub.11 2-ketoacids can be used to produce C.sub.6-C.sub.10 aldehydes, alkanes, alcohols, and carboxylic acids, both in vivo and in vitro.

Provided herein are processes and microorganisms which utilize both protein hydrolysates and carbohydrates from biomass feedstocks to produce renewable hydrocarbon compositions. Advantages of the disclosed methods may be recognized in fuel blends comprising such hydrocarbon compositions.

A novel modified polypeptide having an isopropylmalate synthase activity, a polynucleotide encoding the same, a microorganism comprising the polypeptide, and a method of producing L-leucine by culturing the microorganism.

The present disclosure relates to an isopropylmalate synthase variant and a method of producing L-leucine using the same.

A novel modified polypeptide having an isopropylmalate synthase activity, a polynucleotide encoding the same, a microorganism including the polypeptide, and a method of producing L-leucine by culturing the microorganism.

Genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD enzyme complexes), microbial organisms including genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD), and processes for preparing C7-C11 2-ketoacids with genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD). The genetically modified isopropylmalate isomerase enzyme complexes (e.g., LeuCD enzyme complexes), microbial organisms, and processes for preparing C7-C11 2-ketoacids can be used to produce C6-C10 aldehydes, alkanes, alcohols, and carboxylic acids, both in vivo and in vitro.

Genetically modified LeuCD enzyme complexes, processes for preparing a C.sub.7-C.sub.11 2-ketoacid utilizing genetically modified LeuCD enzyme complexes, and microbial organisms including modified LeuCD enzyme complexes are described. The instantly-disclosed genetically modified LeuCD enzyme complexes, processes for preparing a C.sub.7-C.sub.11 2-ketoacid, and microbial organisms including modified LeuCD enzyme complexes can be particularly useful for producing C.sub.6-C.sub.10 aldehydes, alkanes, alcohols, and carboxylic acids, both in vivo and in vitro.