title: Glycine synthase of the purinolytic bacterium, Clostridium acidiurici. Purification of the glycine-CO2 exchange system.
abstract: When the growth medium of Clostridium acidiurici was supplemented with trace metals, glycine synthase and glycine-CO2 exchange activities in cell-free extracts were found to increase significantly. The glycine-CO2 exchange system was purified and shown to consist of a heat-labile component and a heat-stable component. By gel filtration, heat-labile component had an estimated native Mr = 230,000 and contained two subunits of Mr = 65,000 and 58,000 on sodium dodecyl sulfate-polyacrylamide gels, indicating an alpha 2 beta 2 tetramer. Heat-stable component had an estimated Mr = 20,000 and could not be replaced by lipoic acid in reaction mixtures. Pyridoxal phosphate was not bound to either of the purified components but was essential for glycine-CO2 exchange. By spectral analysis, heat-labile component was shown to interact with pyridoxal phosphate and that reductant influenced this interaction.
mesh_terms: D000594:Amino Acid Oxidoreductases / Q000302:isolation & purification* / Q000378:metabolism; D050960:Aminomethyltransferase; D002245:Carbon Dioxide / Q000378:metabolism*; D003013:Clostridium / Q000201:enzymology*; D005998:Glycine / Q000378:metabolism*; D050841:Glycine Dehydrogenase (Decarboxylating); D006358:Hot Temperature; D019877:Hydroxymethyl and Formyl Transferases; D007700:Kinetics; D046911:Macromolecular Substances; D008970:Molecular Weight; D014166:Transferases / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D046911:Macromolecular Substances; D002245:Carbon Dioxide; D000594:Amino Acid Oxidoreductases; D050841:Glycine Dehydrogenase (Decarboxylating); D014166:Transferases; D019877:Hydroxymethyl and Formyl Transferases; D050960:Aminomethyltransferase; D005998:Glycine