Leukotriene A4 hydrolase (LTA4H) is a monomeric, soluble enzyme that uses a Zn2+ cofactor to catalyse the hydrolysis of the allylic epoxide leukotriene A4 (LTA4) (McGee & Fitzpatrick 1985). LTA4H may also be able to catalyse the hydrolysis of 17R(6)-epoxy-docosahexaenoic acid (17R(16)-epoxy-DHA) to 10(R),17(R)-dihydroxydocosa-4Z,7Z,11E,13E,15Z,19Z-hexaenoic acid (aspirin-triggered (neuro)protectin D1, AT-(N)PD1) (Serhan et al. 2011). In human cells, AT-(N)PD1 decreased PMN migration as well as enhancing efferocytosis of apoptotic human PMN by macrophages, indicating AT-(N)PD1 as a potent anti-inflammatory proresolving molecule (Serhan et al. 2011).
epoxide hydrolase activity of LTA4H:Zn2+ [cytosol]