Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Glycine cleavage system protein H; The glycine cleavage system catalyzes the degradation of glycine. The H protein shuttles the methylamine group of glycine from the P protein to the T protein.

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Glycine decarboxylase (subunit 1) (glycine cleavage system protein P); The glycine cleavage system catalyzes the degradation of glycine. The P protein binds the alpha-amino group of glycine through its pyridoxal phosphate cofactor; CO(2) is released and the remaining methylamine moiety is then transferred to the lipoamide cofactor of the H protein (By similarity).

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Glycine decarboxylase (subunit 2) (glycine cleavage system protein P); The glycine cleavage system catalyzes the degradation of glycine. The P protein binds the alpha-amino group of glycine through its pyridoxal phosphate cofactor; CO(2) is released and the remaining methylamine moiety is then transferred to the lipoamide cofactor of the H protein (By similarity); Belongs to the GcvP family. C-terminal subunit subfamily.

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Aminomethyltransferase (glycine cleavage system protein T); The glycine cleavage system catalyzes the degradation of glycine.

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Serine hydroxymethyltransferase; Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism (By similarity); Belongs to the SHMT family.

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Branched-chain alpha-keto acid dehydrogenase E3 subunit (dihydrolipoamide dehydrogenase); The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO(2). It contains multiple copies of 3 enzymatic components: branched-chain alpha-keto acid decarboxylase (E1), lipoamide acyltransferase (E2) and lipoamide dehydrogenase (E3); Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Acetoin dehydrogenase E3 component (dihydrolipoamide dehydrogenase); Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Dihydrolipoyl dehydrogenase; Catalyzes the oxidation of dihydrolipoamide to lipoamide; Belongs to the class-I pyridine nucleotide-disulfide oxidoreductase family.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Aspartokinase I (alpha and beta subunits); Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine. Belongs to the aspartokinase family.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Serine hydroxymethyltransferase; Catalyzes the reversible interconversion of serine and glycine with tetrahydrofolate (THF) serving as the one-carbon carrier. This reaction serves as the major source of one-carbon groups required for the biosynthesis of purines, thymidylate, methionine, and other important biomolecules. Also exhibits THF-independent aldolase activity toward beta-hydroxyamino acids, producing glycine and aldehydes, via a retro-aldol mechanism (By similarity); Belongs to the SHMT family.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Homoserine dehydrogenase; Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Aspartokinase II alpha subunit (aa 1->408) and beta subunit (aa 246->408); Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

3-phosphoglycerate dehydrogenase; Catalyzes the reversible oxidation of 3-phospho-D-glycerate to 3-phosphonooxypyruvate, the first step of the phosphorylated L- serine biosynthesis pathway. Also catalyzes the reversible oxidation of 2-hydroxyglutarate to 2-oxoglutarate.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Phosphoserine aminotransferase; Catalyzes the reversible conversion of 3- phosphohydroxypyruvate to phosphoserine and of 3-hydroxy-2-oxo-4- phosphonooxybutanoate to phosphohydroxythreonine; Belongs to the class-V pyridoxal-phosphate-dependent aminotransferase family. SerC subfamily.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Homoserine kinase; Catalyzes the ATP-dependent phosphorylation of L-homoserine to L-homoserine phosphate; Belongs to the GHMP kinase family. Homoserine kinase subfamily.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Threonine synthase; Catalyzes the gamma-elimination of phosphate from L- phosphohomoserine and the beta-addition of water to produce L- threonine.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Tryptophan synthase (alpha subunit); The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate; Belongs to the TrpA family.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Aspartate kinase III; Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine.

Aspartokinase I (alpha and beta subunits); Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine. Belongs to the aspartokinase family.

Aspartate-semialdehyde dehydrogenase; Catalyzes the NADPH-dependent formation of L-aspartate- semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl- 4-phosphate; Belongs to the aspartate-semialdehyde dehydrogenase family.

Aspartokinase I (alpha and beta subunits); Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine. Belongs to the aspartokinase family.

Homoserine dehydrogenase; Evidence 1a: Function experimentally demonstrated in the studied strain; Product type e: enzyme.

Aspartokinase I (alpha and beta subunits); Catalyzes the phosphorylation of the beta-carboxyl group of aspartic acid with ATP to yield 4-phospho-L-aspartate, which is involved in the branched biosynthetic pathway leading to the biosynthesis of amino acids threonine, isoleucine and methionine. Belongs to the aspartokinase family.

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 (By similarity).