Metal bioremediation and metal mining strategies can include compositions and methods.

The present invention relates to a recombinant microorganism useful for the production of L-methionine and process for the preparation of L-methionine. The microorganism of the invention is modified in a way that the L-methionine production is improved by using a thiocarboxylated protein as sulfur donor and by expressing an enzyme having homoserine O-acetyltransferase activity without feedback inhibition by methionine and/or S-adenosylmethionine and an enzyme having O-acetylhomoserine sulfhydrylase activity.

The present disclosure relates to a method for increasing lipid content in microorganisms. The method comprises decreasing the expression of molecules involved in the protein synthesis to decrease protein synthesis and thereby increase lipid synthesis in the microorganisms. The present disclosure also provides a modified microorganism having increased lipid content.

The present disclosure relates to a microorganism producing O-acetylhomoserine with high efficiency and a method for producing O-acetylhomoserine and L-methionine using the microorganism. The present disclosure provides a microorganism producing O-acetylhomoserine having an enhanced activity of a protein which is predicted to export O-acetylhomoserine, and a method for producing O-acetylhomoserine and L-methionine using the microorganism.

Disclosed is a microorganism of Escherichia sp. producing O-acetyl homoserine, and a method of producing O-acetyl homoserine in high yield using the microorganism.

The present disclosure relates to a method for increasing biomass synthesis capacity of microorganisms. The method in accordance with the present disclosure comprises overexpressing the genes involved in protein synthesis to increase the levels of protein synthesis and thereby, increase the biomass synthesis capacity of the microorganisms. The present disclosure also provides a modified microorganism having increased biomass synthesis capacity.

The present invention relates to the identification of alleles of the MET2 and SKP2 genes having the effect of reducing the production of sulphites, of hydrogen sulphide and of acetaldehyde by Saccharomyces, and to the use of these alleles in methods for controlling the production of these compounds during alcoholic fermentation.