The glycine cleavage system (glycine decarboxylase complex) catalyzes the degradation of glycine. The H protein shuttles the methylamine group of glycine from the P protein to the T protein (By similarity). Binds 1 lipoyl cofactor covalently. Component of the glycine decarboxylase complex (GDC), which is composed of four proteins: P, T, L and H. Induced by glycine and repressed by the C1 metabolic end products. Present with 3510 molecules/cell in log phase SD medium. Belongs to the GcvH family. Extended N-terminus.