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Ruminal bioshynthesis of aromatic amino acids from arylacetic acids, glucose, shikimic acid and phenol

Published online by Cambridge University Press:  09 March 2007

S. Kristensen
S. Kristensen
Affiliation:
Organic Chemical Laboratory, Royal Veterinary and Agricultural University, Copenhagen, Denmark
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Abstract

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1. Ruminal metabolism of labelled phenylacetic acid, 4-hydroxyphenylacetic acid, indole-3-acetic acid, glucose, shikimic acid, phenol, and serine was studied in vitro by short-term incubation with special reference to incorporation rates into aromatic amino acids.

2. Earlier reports on reductive carboxylation of phenylacetic acid and indole-3-acetic acid in the rumen were confirmed and the formation of tyrosine from 4-hydroxyphenylacetic acid was demonstrated for the first time.

3. The amount of phenylalanine synthesized from phenylacetic acid was estimated to be 2 mg/1 rumen contents per 24 h, whereas the amount synthesized from glucose might be eight times as great, depending on diet.

4. Shikimic acid was a poor precursor of the aromatic amino acids, presumably owing to its slow entry into rumen bacteria.

5. A slow conversion of phenol into tyrosine was observed.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 31 , Issue 3 , May 1974 , pp. 357 - 365
Copyright
Copyright © The Nutrition Society 1974

References

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