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Metabolism of dl-Lysine-2- and -6-¹⁴C in Rats and Dogs

From the ¹ From the Department of Biochemistry, Agricultural Experiment Station, Oklahoma State University, Stillwater, Oklahoma 74074

Liver, carcass (rat), and plasma (dog) glutamic and aspartic acids have been isolated from rats and dogs given lysine-2- or -6-¹⁴C. In some instances considerable non-carboxyl labeling was observed in glutamate and aspartate, presumably resulting from lysine catabolism by intestinal flora. Lysine-6-¹⁴C yielded tissue glutamate labeled predominantly in carbon 1, and lysine-2-¹⁴C yielded tissue glutamate labeled predominantly in carbon 5. These results indicate that during the mammalian catabolism of lysine, glutaryl coenzyme A, but not free glutaric acid, is a major intermediate.

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