O-PHOSPHORYLETHANOLAMINE (cas 1071-23-4) ammonia lyase, a new pyridoxal phosphate-dependent enzyme

Add time:07/27/2019    Source:sciencedirect.com

O-PHOSPHORYLETHANOLAMINE (cas 1071-23-4) ammonia lyase, a new enzyme present in vertebrate liver, has been shown to catalyze the catabolism of O-phosphorylethanolamine to equimolar quantities of ammonia, acetaldehyde, and inorganic phosphate. The enzyme occurs in the soluble fraction of the cell and has been partially purified from rabbit liver. Using 14C O-PE as substrate, the 14C acetaldehyde formed enzymatically was characterized as the 2,4-dinitrophenylhydrazone by infrared spectra and chromatography. Ethanolamine is not a substrate for the enzyme nor does the cobamide coenzyme affect its rate. The Km for O-phosphorylethanolamine was found to be 6.1 × 10−4M and for pyridoxal phosphate 2.7 × 10−7M.

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