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

This report; will cover studies of the metabolism of a supplemental source of L-methionine (L-met), Alimet(R) 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-rhydroxy-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.