Amino acid metabolism nematodes

It is not yet known whether the latter can be metabolized to obtain energy. In the nematodes H. polygyrus and Panagrellus redivivus branched-chain amino acid metabolism follows the same pathways as in mammalian liver (22). 

Grantham, B. D. and Barrett J. (1986) Amino acid catabolism in the nematodes Helig-mosomoides polygyrus and Panagrellus redivivus. 2. Metabolism of the carbon skeleton. Parasitology 93 495-504. 

Little is known about the transport of amino acids across the intestine of nematodes. In vitro studies using isolated segments of intestine from A. suum indicate that uptake of methionine, glycine, histidine and valine is stereospecific and non-linear with respect to concentration, indicative of a mediated transport process (12). Most nematodes excrete a wide range of amino acids (149), and though some of these, such as alanine and proline, are true metabolic end-products, others must be derived from ingested materials. 

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