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PathWhiz ID Pathway Meta Data

PW088535

Pw088535 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Caenorhabditis elegans
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW064660

Pw064660 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Mus musculus
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW088374

Pw088374 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Rattus norvegicus
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW088281

Pw088281 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Bos taurus
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW088433

Pw088433 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Drosophila melanogaster
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW000166

Pw000166 View Pathway
metabolic

Threonine and 2-Oxobutanoate Degradation

Homo sapiens
2-oxobutanoate, also known as 2-Ketobutyric acid, is a 2-keto acid that is commonly produced in the metabolism of amino acids such as methionine and threonine. Like other 2-keto acids, degradation of 2-oxobutanoate occurs in the mitochondrial matrix and begins with oxidative decarboxylation to its acyl coenzyme A derivative, propionyl-CoA. This reaction is mediated by a class of large, multienzyme complexes called 2-oxo acid dehydrogenase complexes. While no 2-oxo acid dehydrogenase complex is specific to 2-oxobutanoate, numerous complexes can catalyze its reaction. In this pathway the branched-chain alpha-keto acid dehydrogenase complex is depicted. All 2-oxo acid dehydrogenase complexes consist of three main components: a 2-oxo acid dehydrogenase (E1) with a thiamine pyrophosphate cofactor, a dihydrolipoamide acyltransferase (E2) with a lipoate cofactor, and a dihydrolipoamide dehydrogenase (E3) with a flavin cofactor. E1 binds the 2-oxobutanoate to the lipoate on E2, which then transfers the propionyl group to coenzyme A, producing propionyl-CoA and reducing the lipoate. E3 then transfers protons to NAD in order to restore the lipoate. Propionyl-CoA carboxylase transforms the propionyl-CoA to S-methylmalonyl-CoA, which is then converted to R-methylmalonyl-CoA via methylmalonyl-CoA epimerase. In the final step, methylmalonyl-CoA mutase acts on the R-methylmalonyl-CoA to produce succinyl-CoA.

PW122600

Pw122600 View Pathway
metabolic

Threonine Biosynthesis

Pseudomonas aeruginosa
The biosynthesis of threonine starts with oxalacetic acid interacting with an L-glutamic acid through an aspartate aminotransferase resulting in a oxoglutaric acid and an L-aspartic acid. The latter compound is then phosphorylated by an ATP driven Aspartate kinase resulting in an a release of an ADP and an L-aspartyl-4-phosphate. L-aspartyl-4-phosphate then interacts with a hydrogen ion through an NADPH driven aspartate semialdehyde dehydrogenase resulting in the release of a phosphate, an NADP and a L-aspartate-semialdehyde. The latter compound interacts with a hydrogen ion through a NADPH driven aspartate kinase / homoserine dehydrogenase resulting in the release of an NADP and a L-homoserine. L-homoserine is phosphorylated through an ATP driven homoserine kinase resulting in the release of an ADP, a hydrogen ion and a O-phosphohomoserine. O-phosphohomoserine then interacts with a water molecule and threonine synthase resulting in the release of a phosphate and an L-threonine.

PW000817

Pw000817 View Pathway
metabolic

Threonine Biosynthesis

Escherichia coli
The biosynthesis of threonine starts with oxalacetic acid interacting with an L-glutamic acid through an aspartate aminotransferase resulting in a oxoglutaric acid and an L-aspartic acid. The latter compound is then phosphorylated by an ATP driven Aspartate kinase resulting in an a release of an ADP and an L-aspartyl-4-phosphate. L-aspartyl-4-phosphate then interacts with a hydrogen ion through an NADPH driven aspartate semialdehyde dehydrogenase resulting in the release of a phosphate, an NADP and a L-aspartate-semialdehyde. The latter compound interacts with a hydrogen ion through a NADPH driven aspartate kinase / homoserine dehydrogenase resulting in the release of an NADP and a L-homoserine. L-homoserine is phosphorylated through an ATP driven homoserine kinase resulting in the release of an ADP, a hydrogen ion and a O-phosphohomoserine. O-phosphohomoserine then interacts with a water molecule and threonine synthase resulting in the release of a phosphate and an L-threonine.

PW122449

Pw122449 View Pathway
metabolic

Threonine Biosynthesis

Saccharomyces cerevisiae

PW002401

Pw002401 View Pathway
metabolic

Threonine Metabolism

Saccharomyces cerevisiae
The biosynthesis of threonine starts with L-aspartic acid being phosphorylated by an ATP-driven aspartate kinase resulting in a release of an ADP and an L-aspartyl-4-phosphate. This compound interacts with a hydrogen ion through an NADPH-driven aspartate semialdehyde dehydrogenase resulting in the release of a phosphate, an NADP, and an L-aspartate-semialdehyde. The latter compound interacts with a hydrogen ion through an NADPH-driven aspartate kinase / homoserine dehydrogenase resulting in the release of an NADP and an L-homoserine. L-Homoserine is phosphorylated through an ATP driven homoserine kinase resulting in the release of an ADP, a hydrogen ion, and an O-phosphohomoserine. The latter compound then interacts with a water molecule threonine synthase resulting in the release of a phosphate and an L-threonine. L-threonine is degraded into glycine and acetaldehyde by reacting with a threonine aldolase. Acetaldehyde can then be integrated into the mitochondria or stay in the cytosol. It is then degraded into acetyl-CoA through an aldehyde dehydrogenase.