Abstract
Human monocytes and macrophages contain an esterolytic activity that hydrolyses alpha naphthyl acetate (ANA). The sensitivity of the monocyte esterase to the inhibitor diisopropylfluorophosphate classifies this enzyme as a carboxylesterase with a serine residue at the active site which is involved in hydrolysis. ANA cleaving enzymes are also present in other haematopoietic cells. Isoelectric focusing of proteins from purified haemapoietic cells reveals different patterns of ANA cleaving enzymes which are specific for each cell type. Monocytes contain at least five ANA cleaving enzymes with a predominant enzyme activity at pH 5.9 [1].
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