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Review of the metabolism of 2-hydroxy-4-(methylthio) butanoic acid*

Published online by Cambridge University Press:  18 September 2007

J.J. Dibner
J.J. Dibner
Affiliation:
Novus International:, Inc., 20 Research Park Drive, Missouri Research Park, St. Charles, MO 63304USA, e-mail: [email protected]
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Abstract

This report will cover studies of the metabolism of a supplemental source of L-methionine (L-met), Alimet® feed supplement. The goal of these studies was to gain an understanding of how this methionine precursor is converted to L-methionine and how it is used by the chick, in order to optimise the conditions for its use. The methionine precursor in Alimet is 2-hydroxy-4- (methylthio) butanoic acid (HMB). HMB differs from methionine by having a hydroxyl group on the alpha carbon rather than an amino group. Like synthetic DL-met, HMB has one asymmetrical carbon atom and therefore occurs as a mixture of 50% L-isomer and 50% D-isomer. Because HMB bears a hydroxyl group instead of an amino group, it is an organic acid. Until it is converted to L-met antimicrobial properties of HMB resemble those of organic acids such as lactic acid. Once inside the tissue of the animal, however, HMB is rapidly converted to L-met. Following conversion to L-met, HMB will have the same availability for methyl group transfer or cysteine synthesis as L-met from any other source. This report will cover the bioavailability of HMB polymers, the conversion of HMB to L-met and the role of HMB in normal L-met intermediary metabolism. It will also include a discussion of HMB absorption and incorporation into protein.

Keywords

2-hydroxy-4- (methylthio) butanoic acid HMBmethionine metabolism
Type
Reviews
Information
World's Poultry Science Journal , Volume 59 , Issue 1 , March 2003 , pp. 99 - 110
Copyright
Copyright © Cambridge University Press 2003

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