Abstract
Phosphatases, C4 and C8 esterases, leucine and valine aminopeptidases, n-acetyl-β-glucosaminidase, β-glucosidase, β-galactosidase and β-glucuronidase were active in extracts of scab mites ( Psoroptes spp.) raised on sheep or rabbits. Trypsin and chymotrypsin activities were not detected. Haemoglobin was hydrolysed by a detergent-soluble fraction of the mite extracts in a pH-dependent fashion with an optimum of pH 3–5. Acid proteinase activity was greater in mites raised on rabbits than in those raised on sheep. Inhibitors of cysteine, serine and metallo-proteinases failed to inhibit the hydrolysis of H–Pro–Thr–Glu–Phe–Phe(NO 2)Arg–Leu–OH while pepstatin A, a specific inhibitor of aspartic proteinases, totally inhibited its hydrolysis at a concentration of 1 nM.
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