A protein complex that catalyzes the reversible oxidation of glycine. In E. coli, it has four components: dihydrolipoamide dehydrogenase, glycine dehydrogenase (decarboxylating), lipoyl-GcvH-protein and aminomethyltransferase, also known as L, P, H, and T. [ http://biocyc.org/META/NEW-IMAGE?type=NIL&object=GCVMULTI-CPLX ]