The instant disclosure is generally related to compositions and methods for obtaining and constructing Bacillus licheniformis host cells (e.g., protein production host cells, cell factories) having increased protein production capabilities. Certain embodiments of the disclosure are directed to efficient genetic modifications of B. licheniformis cells and the subsequent selection of such B. licheniformis cells having increased protein production capabilities. Certain other embodiments of the disclosure are generally related to methods and compositions for producing/obtaining auxotrophic B. licheniformis cells, wherein certain other embodiments of the disclosure are directed to methods and compositions for restoring prototrophy in auxotrophic B. licheniformis cells, and expressing genes of interest (GOIs) in such restored prototrophy B. licheniformis cells.

The present invention relates to a compound of general formula I

##STR00001##

The present invention also relates to a method of producing N-acetyl homoserine and/or derivatives thereof, the method comprising contacting at least one recombinant cell in an aqueous medium with acetate wherein the recombinant cell comprises an increased activity relative to a wild type cell of (a) an enzyme E.sub.1, a homoserine dehydrogenase (EC1.1.1.3) and/or an enzyme E.sub.5, an aspartokinase (EC2.7.2.4); and (b) an enzyme E.sub.2, a homoserine O-acetyl transferase (EC2.3.1.31)
and the acetate is maintained at a concentration of at least about 0.001 g/L in the aqueous medium.

The present invention relates to an L-lysine-producing microorganism of the genus Corynebacterium and a method for producing L-lysine using the same.

Certain C. glutamicum strains overexpress genes coding for enzymes having the function of aspartate-semialdehyde dehydrogenase, aspartate aminotransferase, dihydrodipicolinate synthase, dihydrodipicolinate reductase, diaminopimelate decarboxylase, aspartatokinase and diaminopimelate dehydrogenase. The C. glutamicum strains also express NAD(P)(+) transhydrogenase subunit alpha PntA and NAD(P)(+) transhydrogenase subunit beta PntB of Corynebacterium urealyticum. A method is developed for the fermentative production of L-lysine using such C. glutamicum strains.

The instant disclosure is generally related to compositions and methods for obtaining and constructing Bacillus licheniformis host cells (e.g., protein production host cells, cell factories) having increased protein production capabilities. Certain embodiments of the disclosure are directed to efficient genetic modifications of B. licheniformis cells and the subsequent selection of such B. licheniformis cells having increased protein production capabilities. Certain other embodiments of the disclosure are generally related to methods and compositions for producing/obtaining auxotrophic B. licheniformis cells, wherein certain other embodiments of the disclosure are directed to methods and compositions for restoring prototrophy in auxotrophic B. licheniformis cells, and expressing genes of interest (GOIs) in such restored prototrophy B. licheniformis cells.

The present invention relates to a Corynebacterium glutamicum variant having an improved L-lysine production ability, and a method for producing L-lysine by using same. The Corynebacterium glutamicum variant increases or enhances the expression of a gene encoding diaminopimelate decarboxylase, and thus can have a L-lysine production yield superior to that of a parental strain.

The present invention relates to a recombinant microbial cell for producing at least one compound having structural Formula III from at least one simple carbon source:

##STR00001## wherein the simple carbon source is selected from the group consisting of glucose, sucrose, xylose, arabinose, mannose and glycerol; and wherein the cell comprises a further genetic modification to increase production of L-lysine in the cell from at least one of the simple carbon sources.

The present disclosure relates to a variant polypeptide having attenuated dihydrodipicolinate reductase activity and a method of producing L-threonine using the same.

The present disclosure relates to a modified polypeptide, in which the activity of meso-diaminopimelate is weakened, and a method for producing L-threonine using the same.