Glycine cleavage system P-protein, alpha- and beta-subunits. 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. The reaction catalysed by this protein is: Glycine + lipoylprotein <=> S-aminomethyldihydrolipoylprotein + CO2. Alpha-beta-type dimers associate to form an alpha(2)beta(2) tetramer, where the alpha- and beta-subunits are structurally similar and appear to have arisen by gene duplication and subsequent divergence with a loss of one active site. The members of this CD are widely dispersed among all three forms of cellular life.
Comment:cofactor PLP is bound to the active-site pocket and forms an internal aldimine bond (Schiff base linkage) with a catalytic Lys residue from the beta subunit
Structure:1WYU_B; Glycine cleavage system P-protein bound to pyridoxamine phosphate
Jiyao W et al.(2023). "The conserved domain database in 2023.",