Purification and properties of glycine decarboxylase, a component of the glycine cleavage system, from rat liver mitochondria and immunochemical comparison of this enzyme from various sources

Hayasaka, K.; Kochi, H.; Hiraga, K.; Kikuchi, G.

Journal of Biochemistry 88(4): 1193-1199


ISSN/ISBN: 0021-924X
PMID: 6778858
DOI: 10.1093/oxfordjournals.jbchem.a133074
Accession: 006229767

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Glycine decarboxylase, tentatively called P-protein as a constituent of the glycine cleavage system, was purified to near homogeneity from rat liver mitochondria. The purified P-protein was a homodimer with a molecular weight of about 210,000, consisting of identical subunits with a molecular weight of 105,000. In the exchange reaction of the carboxyl carbon of glycine wih CO2 catalyzed by the purified P-protein in the presence of H-protein, the pH optimum was 6.7, Km for glycine was 6.6 mM, and Km for H-protein was 7.4 microM. A specific rabbit antibody against the purified rat liver P-protein was prepared. Ouchterlony double diffusion analysis and immunoinhibition experiments using this antibody revealed immunological cross-reactivity among the P-proteins from various species of animals such as carp, frog, snake, chicken, bovine, and human, suggesting a quite conservative evolution of the glycine cleavage system.