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Glycine Decarboxylase Complex: A enzyme complex that catalyzes the oxidative DECARBOXYLATION and DEAMINATION of GLYCINE into CARBON DIOXIDE; AMMONIA; NADH; and N5N10-methylenetetrahydrofolate. It is composed of four different component protein components referred to as H, P, L, and T.Glycine Decarboxylase Complex H-Protein: A LIPOIC ACID-containing protein that plays the pivotal role in the transfer of methylamine groups and reducing equivalents between the three enzymatic components of the glycine decarboxylase complex.Glycine Dehydrogenase (Decarboxylating): A PYRIDOXAL PHOSPHATE dependent enzyme that catalyzes the decarboxylation of GLYCINE with the transfer of an aminomethyl group to the LIPOIC ACID moiety of the GLYCINE DECARBOXYLASE COMPLEX H-PROTEIN. Defects in P-protein are the cause of non-ketotic hyperglycinemia. It is one of four subunits of the glycine decarboxylase complex.Aminomethyltransferase: A one-carbon group transferase that transfers lipoamide-linked methylamine groups to tetrahydrofolate (TETRAHYDROFOLATES) to form methylenetetrahydrofolate and AMMONIA. It is one of four components of the glycine decarboxylase complex.Amino Acid Oxidoreductases: A class of enzymes that catalyze oxidation-reduction reactions of amino acids.Dihydrolipoamide Dehydrogenase: A flavoprotein containing oxidoreductase that catalyzes the reduction of lipoamide by NADH to yield dihydrolipoamide and NAD+. The enzyme is a component of several MULTIENZYME COMPLEXES.Plants, Medicinal: Plants whose roots, leaves, seeds, bark, or other constituent parts possess therapeutic, tonic, purgative, curative or other pharmacologic attributes, when administered to man or animals.Glycine: A non-essential amino acid. It is found primarily in gelatin and silk fibroin and used therapeutically as a nutrient. It is also a fast inhibitory neurotransmitter.Ornithine Decarboxylase: A pyridoxal-phosphate protein, believed to be the rate-limiting compound in the biosynthesis of polyamines. It catalyzes the decarboxylation of ornithine to form putrescine, which is then linked to a propylamine moiety of decarboxylated S-adenosylmethionine to form spermidine.Hydroxymethyl and Formyl Transferases: Enzymes that catalyze the transfer of hydroxymethyl or formyl groups. EC 2.1.2.