This family consists of Glycine cleavage system P-proteins EC:1.4.4.2 from bacterial, mammalian and plant sources. The P protein is part of the glycine decarboxylase multienzyme complex EC:2.1.2.10 (GDC) also annotated as glycine cleavage system or glycine synthase. GDC consists of four proteins P, H, L and T [2]. The reaction catalysed by this protein is:- Glycine + lipoylprotein <=> S-aminomethyldihydrolipoylprotein + CO2

1: Genetics of the synthesis of serine from glycine and the utilization of glycine as sole nitrogen source by Saccharomyces cerevisiae. Sinclair DA, Dawes IW; Genetics 1995;140:1213-1222. PMID:7498764

2: Characterization of the Escherichia coli gcv operon. Stauffer LT, Fogarty SJ, Stauffer GV; Gene 1994;142:17-22. PMID:8181752