methylmalonyl-CoA epimerase; Promiscuous isomerase that catalyzes epimerization of both ethylmalonyl-CoA and methylmalonyl-CoA. Has thus a dual role in the ethylmalonyl-CoA pathway for acetyl-CoA assimilation required for R.sphaeroides growth on acetate as sole carbon source.

(R)-ethylmalonyl-CoA mutase; Radical enzyme that catalyzes the transformation of (2R)- ethylmalonyl-CoA to (2S)-methylsuccinyl-CoA. Is involved in the ethylmalonyl-CoA pathway for acetyl-CoA assimilation required for R.sphaeroides growth on acetate as sole carbon source. Is highly specific for its substrate, ethylmalonyl-CoA, and accepts methylmalonyl-CoA only at 0.2% relative activity.

Succinyl-CoA synthetase, alpha subunit; Succinyl-CoA synthetase functions in the citric acid cycle (TCA), coupling the hydrolysis of succinyl-CoA to the synthesis of either ATP or GTP and thus represents the only step of substrate-level phosphorylation in the TCA. The alpha subunit of the enzyme binds the substrates coenzyme A and phosphate, while succinate binding and nucleotide specificity is provided by the beta subunit.

IMG reference gene:2512955012; PFAM: Acetyl-CoA hydrolase/transferase N-terminal domain; Citrate lyase, alpha subunit (CitF); TIGRFAM: succinate CoA transferases.

succinyl-CoA synthetase (ADP-forming) beta subunit; Succinyl-CoA synthetase functions in the citric acid cycle (TCA), coupling the hydrolysis of succinyl-CoA to the synthesis of either ATP or GTP and thus represents the only step of substrate-level phosphorylation in the TCA. The beta subunit provides nucleotide specificity of the enzyme and binds the substrate succinate, while the binding sites for coenzyme A and phosphate are found in the alpha subunit.

malonyl-CoA synthase; IMG reference gene:2512956081; PFAM: AMP-binding enzyme.

Pyruvate carboxylase; Catalyzes a 2-step reaction, involving the ATP-dependent carboxylation of the covalently attached biotin in the first step and the transfer of the carboxyl group to pyruvate in the second.

Malate dehydrogenase (NAD); Catalyzes the reversible oxidation of malate to oxaloacetate. Belongs to the LDH/MDH superfamily. MDH type 3 family.

Phosphoenolpyruvate carboxykinase; Involved in the gluconeogenesis. Catalyzes the conversion of oxaloacetate (OAA) to phosphoenolpyruvate (PEP) through direct phosphoryl transfer between the nucleoside triphosphate and OAA.