The oxidation of various synthetic α-amino-acids by mammalian <scp>d</scp>-amino-acid oxidase, <scp>l</scp>-amino-acid oxidase of cobra venom and the <scp>l</scp>- and <scp>d</scp>-amino-acid oxidases of <i>Neurospora crassa</i>

Abstract

all and the 15N found in glycine after feeding 16N- labelled amino-acids other than glycine and serine, may, as already suggested by Shemin (1946), arise by synthesis of glycine from a substance other than glyoxylic acid. SUMMARY 1. Glycine containing excess 15N was fed to rabbits and rats, and various amino-acids were isolated from protein of muscle and internal organs respectively. The glycine, serine, glutamic acid, arginine and tyrosine contained varying concen- trations of isotopic nitrogen. Lysine and threonine had no excess 15N.