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.

Phosphoribosylglycinamide formyltransferase; Catalyzes the transfer of a formyl group from 10- formyltetrahydrofolate to 5-phospho-ribosyl-glycinamide (GAR), producing 5-phospho-ribosyl-N-formylglycinamide (FGAR) and tetrahydrofolate.

Glycine cleavage system protein T; The glycine cleavage system catalyzes the degradation of glycine.

Glycine dehydrogenase (aminomethyl-transferring); 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; Belongs to the GcvP family. C-terminal subunit subfamily.

5-aminoimidazole-4-carboxamide ribonucleotide transformylase; Catalyzes the formylation of AICAR with 10-formyl-tetrahydrofolate to yield FAICAR and tetrahydrofolate; Derived by automated computational analysis using gene prediction method: Protein Homology.

Glutamate formimidoyltransferase; Derived by automated computational analysis using gene prediction method: Protein Homology.

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.

5-formyltetrahydrofolate cyclo-ligase; Derived by automated computational analysis using gene prediction method: Protein Homology; Belongs to the 5-formyltetrahydrofolate cyclo-ligase family.