The present invention relates to a method for improving the heterologous synthesis of a polyketide by E. coli and use thereof. The yield of the polyketide heterologously synthesized by E. coli is significantly increased by attenuating the expression of seventy-two genes, such as sucC and talB, in a host strain, wherein the highest yield increase rate can reach 60% or more. Currently, erythromycin is the most clear model compound in the study on the biosynthesis of polyketids. The production strain of the present invention enables massive accumulation of 6-deoxyerythronolide (6-dEB), an erythromycin precursor, in the fermentation process, laying the foundation for the industrial production of the heterologous synthesis of erythromycin by E. coli.

The disclosure relates to sesquiterpene homologues, their use as fragrance and a method of their production.

The present disclosure relates to chemo-enzymatic processes for the preparation of lactones (including, e.g., macrolactones, -lactones, and -lactones) and/or macrocyclic ketones, which are compounds of industrial value, for example, for use as fragrance ingredients. The chemo-enzymatic processes combine the in vivo microbial production of fatty acid derivatives and the subsequent ex vivo synthetic transformation of the fatty acid derivatives to provide the lactones and macrocyclic ketones.

The present disclosure relates to chemo-enzymatic processes for the preparation of lactones (including, e.g., macrolactones, -lactones, and -lactones) and/or macrocyclic ketones, which are compounds of industrial value, for example, for use as fragrance ingredients. The chemo-enzymatic processes combine the in vivo microbial production of fatty acid derivatives and the subsequent ex vivo synthetic transformation of the fatty acid derivatives to provide the lactones and macrocyclic ketones.

Improved methods of making amberketal and amberketal homologues and compositions comprising same, improved squalene-hopene cyclase (SHC) enzymes to be used in said methods, nucleic acid constructs and vectors encoding said enzymes, and host cells expressing said enzymes.

Improved methods of making amberketal and amberketal homologues and compositions comprising same, improved squalene-hopene cyclase (SHC) enzymes to be used in said methods, nucleic acid constructs and vectors encoding said enzymes, and host cells expressing said enzymes.

A method for increasing the molecular diversity of polyketides and non-ribsomomal peptides by using recombination to efficiently increase or decrease the number of modules in the polyketide synthase or non-ribosomal peptide synthetase encoding said polyketide or peptide.

A method for increasing the molecular diversity of polyketides and non-ribsomomal peptides by using recombination to efficiently increase or decrease the number of modules in the polyketide synthase or non-ribosomal peptide synthetase encoding said polyketide or peptide.

Provided herein are methods, compositions, and non-naturally occurring microbial organism for preparing compounds such as 1-butanol, butyric acid, succinic acid, 1,4-butanediol, 1-pentanol, pentanoic acid, glutaric acid, 1,5-pentanediol, 1-hexanol, hexanoic acid, adipic acid, 1,6-hexanediol, 6-hydroxy hexanoic acid, -Caprolactone, 6-amino-hexanoic acid, -Caprolactam, hexamethylenediamine, linear fatty acids and linear fatty alcohols that are between 7-25 carbons long, linear alkanes and linear -alkenes that are between 6-24 carbons long, sebacic acid and dodecanedioic acid comprising: a) converting a C.sub.N aldehyde and pyruvate to a C.sub.N+3 -hydroxyketone intermediate through an aldol addition; and b) converting the C.sub.N+3-hydroxyketone intermediate to the compounds through enzymatic steps, or a combination of enzymatic and chemical steps.

The present disclosure relates to processes that combine microbial production of organic intermediates and subsequent synthetic transformation to provide compounds of industrial value, including compounds used in fragrances.