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• W2180026370 abstract "Sarcocystis neurona merozoites were examined for their ability to invade and divide in bovine turbinate (BT) cell cultures after treatment with cysteine (iodoacetamide), aspartic (pepstatin A), metallo-(1,10-phenanthroline and ethylene glycol-bis(aminoethylether)-tetraacetic acid [EGTA]), or serine (4-[2-aminoethyl]-benzenesulfonyl fluoride hydrochloride [AEBSF], phenylmethane sulphonyl fluoride [PMSF], and tosyl lysyl chloramethyl ketone [TLCK]) protease inhibitors. Significant (P < 0.01) inhibition of serine protease activity by PMSF and TLCK led to a reduction of 86 and 78% in merozoites produced in BT cell cultures, respectively, whereas AEBSF (1 mM) led to a 68% reduction in merozoites produced in BT cell cultures and a reduction of 84 and 92% at higher AEBSF concentrations (2 and 3 mM, respectively). Pepstatin A and iodoacetamide failed to cause any inhibition in merozoite production, whereas 1,10-phenanthroline and EGTA caused slight, but not significant, inhibition at 6 and 17%, respectively. In zymograms, 2 bands of protease activity between 65- and 70-kDa molecular weight were seen. The protease activity was inhibited by AEBSF but not by E-64 (cysteine protease inhibitor), EGTA, iodoacetamide, or pepstatin A. In native zymograms, the protease activity was highest between a pH range of 8 and 10. These data suggest that merozoites of S. neurona have serine protease activity with a relative molecular weight range between 65 and 70 kDa and optimal pH range between 8 and 10, which is essential for host cell entry at least in vitro. The protease activity described here could be a potential target for chemotherapy development." @default.
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• W2180026370 date "2003-04-01" @default.
• W2180026370 modified "2023-10-05" @default.
• W2180026370 title "Characterization of a Serine Protease Activity in Sarcocystis neurona Merozoites" @default.
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• W2180026370 doi "https://doi.org/10.1645/0022-3395(2003)089[0385:coaspa]2.0.co;2" @default.
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