Phosphoserine phosphatase (PSP) catalyzes the third step of the phosphorylated serine biosynthetic pathway, and occurred multiple times in evolution, while enzymes catalyzing the first and second steps in the pathway have single respective origins. In the present study, we examined the existence of PSP among genus Entamoeba including a human enteric parasite, Entamoeba histolytica. E. histolytica as well as majority of Entamoeba species have the first and second enzymes, but lacks PSP. In contrast, a reptilian enteric parasite, Entamoeba invadens possesses canonical PSP. Thus, there are variations in the existence of the serine biosynthetic ability among Entamoeba species.
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