Group I pyridoxal-dependent decarboxylases
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| Glycine cleavage system P-protein | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 crystal structure of glycine decarboxylase (p-protein) of the glycine cleavage system, in apo form | |||||||||
| Identifiers | |||||||||
| Symbol | GDC-P | ||||||||
| Pfam | PF02347 | ||||||||
| Pfam clan | CL0061 | ||||||||
| InterPro | IPR020580 | ||||||||
| |||||||||
In molecular biology, the group I pyridoxal-dependent decarboxylases, also known as glycine cleavage system P-proteins, are a family of enzymes consisting of glycine cleavage system P-proteins (glycine dehydrogenase (decarboxylating)) EC 1.4.4.2 from bacterial, mammalian and plant sources. The P protein is part of the glycine decarboxylase multienzyme complex (GDC) also annotated as glycine cleavage system or glycine synthase. The P protein binds the alpha-amino group of glycine through its pyridoxal phosphate cofactor, carbon dioxide is released and the remaining methylamine moiety is then transferred to the lipoamide cofactor of the H protein. GDC consists of four proteins P, H, L and T.[1]
Pyridoxal-5'-phosphate-dependent amino acid decarboxylases can be divided into four groups based on amino acid sequence. Group I comprises glycine decarboxylases.[2]