Formation of (2E) 4 Hydroxy 2 nonenal and (2E) 4 Hydroxy 2 hexenal by Plant Enzymes: A Review Suggests a Role in the Physiology of Plants
It is demonstrated that (3Z) nonenal (NON) and (3Z) hexenal (HEX) are oxidized in a cascade by lipoxygenase (LOX) and hydroperoxide peroxygenase (HP peroxygenase) into (2E) 4 hydroxy 2 nonenal (HNE) and (2E) 4 hydroxy 2 hexenal (HHE) respectively. In turn, HNE inactivates LOX terminating the cascade. The hydroxy alkenals produced serve to inhibit plant pathogens, which initiated the cascade. In addition to LOX, other unknown oxygenases may be involved in the cascade.