Aspartate kinase; Multifunctional homotetrameric enzyme that catalyzes the phosphorylation of aspartate to form aspartyl-4-phosphate as well as conversion of aspartate semialdehyde to homoserine; functions in a number of amino acid biosynthetic pathways; Derived by automated computational analysis using gene prediction method: Protein Homology.

Catalyzes the formation of cystathionine from L-cysteine and O-succinyl-L-homoserine; Derived by automated computational analysis using gene prediction method: Protein Homology.

Methionine synthase; Catalyzes the transfer of a methyl group from methyl- cobalamin to homocysteine, yielding enzyme-bound cob(I)alamin and methionine. Subsequently, remethylates the cofactor using methyltetrahydrofolate.

O-acetylhomoserine aminocarboxypropyltransferase; Catalyzes the formation of L-methionine and acetate from O-acetyl-L-homoserine and methanethiol; Derived by automated computational analysis using gene prediction method: Protein Homology.

Cysteine synthase; Derived by automated computational analysis using gene prediction method: Protein Homology; Belongs to the cysteine synthase/cystathionine beta- synthase family.

Bifunctional beta-cystathionase/maltose regulon regulatory protein; Catalyzes the formation of homocysteine and pyruvate from cystathionine; also acts a a negative regulator for the mal regulon but interacting with the transcriptional activator MalT; Derived by automated computational analysis using gene prediction method: Protein Homology.

Threonine dehydratase; Catalyzes the anaerobic formation of alpha-ketobutyrate and ammonia from threonine in a two-step reaction. The first step involved a dehydration of threonine and a production of enamine intermediates (aminocrotonate), which tautomerizes to its imine form (iminobutyrate). Both intermediates are unstable and short-lived. The second step is the nonenzymatic hydrolysis of the enamine/imine intermediates to form 2- ketobutyrate and free ammonia. In the low water environment of the cell, the second step is accelerated by RidA.

Aminoacyl-histidine dipeptidase; Catalyzes the hydrolysis of Xaa-His dipeptides; Derived by automated computational analysis using gene prediction method: Protein Homology.

Aminopeptidase B; Catalyzes the removal of an N-terminal amino acid from a peptide or arylamide; Derived by automated computational analysis using gene prediction method: Protein Homology.