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Activity of L-Cysteinesulfinate Carboxy-lyase and Persulfurase in Livers of Rats Fed Different Levels of Sulfate and Cysteine¹

Department of Nutrition and Foods and Agricultural Experiment Station, Auburn University, Auburn, Alabama 36830

Activity of L-cysteinesulfinate carboxy-layse (CSC) and persulfurase was measured in livers of rats fed 15% casein diets supplemented with (1) 0.53% cysteine, (2) 0.40% cysteine, (3) 0.40% cysteine + 0.10% sulfate, (4) 0.42% sulfate, or (5) 0.42% sulfate + 0.40% cysteine. The diets were fed to adult rats for 1 week and to weanling rats for periods of 1 and 4 weeks. At the end of each feeding period, the highest CSC activity was detected in livers from animals fed diet 4, but no differences in CSC activity were detected among livers from the other four groups. Persulfurase activity did not differ significantly among weanling or adult rats fed the diets for 1 week but was lower among those fed diet 4 than diet 5 for 4 weeks. The activity patterns did not parallel those of taurine excretion or conjugation observed previously among rats fed the same diets, and may indicate that factors other than taurine synthesis and ingestion control those processes.

KEY WORDS: • taurine synthesis • persulfurase • L-cysteinesulfinate carboxy-lyase

¹ Published by permission of the Dean, College of Agriculture and Director. Agriculture Experiment Station and the Dean. School of Home Economies.

² Present address: Nisonger Center for Mental Retardation and Developmental Disabilities. Ohio State University, 1580 Cannon Drive, Columbus, Ohio 43210.

Manuscript received 28 April 1975.