抄録
Serine was isolated by the column chromatography from the hydrolyzates of proteins of the serum, the liver and the pectoral muscle which were obtained from the roosters fed a diet containing 2-14C glycine for 16_??_17 days. The carbon chain of serine was cut off by treating with sodium periodate. The specific activity of each carbon (as barium carbonate) was estimated. Carboxyl carbon had little radioactivity. The specific activity of hydroxymethyl carbon was 10_??_19% of that of methylen carbon. Glycine isolated from the same hydrolyzates was degraded by ninhydrin oxidation. Formaldehyde produced from 2-C was oxidized to carbon dioxide by treating with mercuric chloride. Carboxyl carbon had little radioactivity. The specific activities of 2-C of glycine and 2-C of serine in the same tissue protein were compared. The ratio of serine 2-C/glycine 2-C was between 0.7_??_1.5. These results seem to indicate that glycine directly converts to serine in the rooster. The quantitative significance of the pathways of glycine (serine) biosynthesis is discussed.
