Ethanolamine is a metabolite of the nonessential amino acid serine. In the presence of adequate levels of functional B-6 (P-5-P) serine is enzymatically converted to ethanolamine.
Ethanolamine occurs in every cell in the human body as the head group of Phosphatidylethanolamine (and other lipids), and it is present as free ethanolamine at varying concentrations in bodily fluids. For example, the concentration of ethanolamine in the blood and breast milk is 2 μM (range 0–12 μM) and 46 μM, respectively, whereas the concentration is likely much higher in the gastrointestinal tract due to the breakdown of PE derived from ingested food and the turnover/exfoliation of intestinal epithelial cells.
What is Phosphatidylethanolamine?
Phosphatidylethanolamine (PE) is the second most abundant phospholipid in mammalian cells. PE comprises about 15–25% of the total lipid in mammalian cells; it is enriched in the inner leaflet of membranes, and it is especially abundant in the inner mitochondrial membrane.
References:
– https://www.hindawi.com/journals/omcl/2017/4829180/
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