2-isopropylmalate synthase; Catalyzes the condensation of the acetyl group of acetyl-CoA with 3-methyl-2-oxobutanoate (2-oxoisovalerate) to form 3-carboxy-3- hydroxy-4-methylpentanoate (2-isopropylmalate); Belongs to the alpha-IPM synthase/homocitrate synthase family. LeuA type 1 subfamily.

Bifunctional chorismate mutase/prephenate dehydratase P-protein, pheA,; High confidence in function and specificity.

2-isopropylmalate synthase; Catalyzes the condensation of the acetyl group of acetyl-CoA with 3-methyl-2-oxobutanoate (2-oxoisovalerate) to form 3-carboxy-3- hydroxy-4-methylpentanoate (2-isopropylmalate); Belongs to the alpha-IPM synthase/homocitrate synthase family. LeuA type 2 subfamily.

Probable 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.

Probable bifunctional PutA protein; Oxidizes proline to glutamate for use as a carbon and nitrogen source; In the C-terminal section; belongs to the aldehyde dehydrogenase family.

Hydroxymethylglutaryl-CoA lyase, MvaB. It catalyses the conversion of (S)-3-hydroxy-3-methylglutaryl-CoA to acetyl-CoA and acetoacetate during the final step of ketogenesis and leucine catabolism. Similar to trembl|Q8QGJ4 (60%) and to pir|H83394 (56%). InterPro (PF00682): HMG-CoA Lyase-like family; High confidence in function and specificity.

Homoserine dehydrogenase catalyzes NAD-dependent reduction of aspartate beta-semialdehyde into homoserine. This reaction is the third step in a pathway leading from aspartate to homoserine. Similar to TREMBL:Q9RAM9 (77%) and to pir|DEPSHA(PIR (Georgetown University) (56%). Pfam: Homoserine dehydrogenase; High confidence in function and specificity.

3-methyl-2-oxobutanoate hydroxymethyltransferase; Catalyzes the reversible reaction in which hydroxymethyl group from 5,10-methylenetetrahydrofolate is transferred onto alpha- ketoisovalerate to form ketopantoate; Belongs to the PanB family.

Homocitrate synthase is involved in the biosynthesis of the iron-molybdenum cofactor of nitrogenase and catalyzes the condensation of acetyl-CoA and alpha-ketoglutarate into homocitrate. Similar to sprot|NIFV_AZOVI (51%) and to sprot|NIV1_ANASP (42%). Pfam (PF00682): HMG-CoA Lyase-like family InterPro (PS00815): Alpha-isopropylmalate and homocitrate synthase; High confidence in function and specificity; Belongs to the alpha-IPM synthase/homocitrate synthase family.