4.99.1.4	siroheme + 2 H+ = sirohydrochlorin + Fe2+	-	-	
4.99.1.4	siroheme + 2 H+ = sirohydrochlorin + Fe2+	the enzyme from Pseudomonas chloroaphis contains Ca2+ and protoheme IX, the iron of which must be in the form Fe2+ for activity, the enzyme exhibits a strong preference for aliphatic aldoximes, such as butyraldoxime and acetaldoxime, over aromatic aldoximes, such as pyridine-2-aldoxime, which is a poor substrate, no activity was found with the aromatic aldoximes benzaldoxime and pyridine-4-aldoxime, mechanism	649817