5-Phosphonooxy-<small>L</small>-lysine phospho-lyase (EC 4.2.3.134, 5-phosphohydroxy-<small>L</small>-lysine ammoniophospholyase, AGXT2L2 (gene)) is an enzyme with systematic name (5R)-5-phosphonooxy-<small>L</small>-lysine phosphate-lyase (deaminating; (S)-2-amino-6-oxohexanoate-forming). This enzyme catalyses the following chemical reaction
This enzyme is a pyridoxal-phosphate protein.