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The effect of increasing methionine supply on the methionine conversion to cyst(e)ine in sheep

Published online by Cambridge University Press:  09 March 2007

P. M. Pisulewski  and
P. J. Buttery
P. M. Pisulewski
Affiliation:
Department of Applied Biochemistry & Food Science, University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LEI2 5RD
P. J. Buttery
Affiliation:
Department of Applied Biochemistry & Food Science, University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, Leicestershire LEI2 5RD
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Abstract

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1. The conversion of methionine to cyst(e)ine was determined in sheep infused with different amounts of methionine (0-5 g/d) into the duodenum by assaying the incorporation of 36S from intravenously-infused L-[35S]methionine into cyst(e)ine in wool, plasma albumin and the free plasma pool.

2. The percentage of cystine-S in the plasma originating from methionine increased linearly from 4.5 to 18 with increasing supplemental methionine supply.

3. The percentage of cysteine-S in albumin increased from 15 to 50; methionine supply increased to 3 g/d but then remained constant, indicating that the transsulphuration pathway of the liver was exceeded.

4. The percentage of wool cysteine-S originating from methionine was high (∼ 70) at all methionine supplementation rates.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 54 , Issue 1 , July 1985 , pp. 121 - 129
Copyright
Copyright © The Nutrition Society 1985

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