Succinate dehydrogenase, flavoprotein subunit; Identified by similarity to SP:P31038; match to protein family HMM PF00890; match to protein family HMM PF02910; match to protein family HMM TIGR01812; match to protein family HMM TIGR01816; Belongs to the FAD-dependent oxidoreductase 2 family. FRD/SDH subfamily.

Putative succinate dehydrogenase, hydrophobic membrane anchor protein; Identified by similarity to SP:P10445; match to protein family HMM PF01127.

Fumarate hydratase; Involved in the TCA cycle. Catalyzes the stereospecific interconversion of fumarate to L-malate; Belongs to the class-II fumarase/aspartase family. Fumarase subfamily.

succinyl-CoA synthase, 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.

succinyl-CoA synthase, 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.

NADH dehydrogenase I, C/D subunits; NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur (Fe-S) centers, to quinones in the respiratory chain. The immediate electron acceptor for the enzyme in this species is believed to be ubiquinone. Couples the redox reaction to proton translocation (for every two electrons transferred, four hydrogen ions are translocated across the cytoplasmic membrane), and thus conserves the redox energy in a proton gradient; In the N-terminal section; belongs to the complex I 30 kDa subunit family.

Succinate-semialdehyde dehydrogenase (NADP+); Identified by similarity to SP:P25526; match to protein family HMM PF00171; match to protein family HMM TIGR01780; Belongs to the aldehyde dehydrogenase family.

Putative dehydrogenase subunit; Identified by similarity to GP:4007678; match to protein family HMM PF01257; match to protein family HMM PF01512.

NAD-reducing hydrogenase, alpha subunit; Identified by similarity to SP:P22317; match to protein family HMM PF01257; match to protein family HMM PF01512.