A pyridoxal-phosphate protein. A component of the glycine cleavage system, which is composed of four components that only loosely associate: the P protein (EC
1.4.4.2), the T protein (EC
2.1.2.10, aminomethyltransferase), the L protein (EC
1.8.1.4, dihydrolipoyl dehydrogenase) and the lipoyl-bearing H protein [3]. Previously known as glycine synthase.