Bacterial Agglutination by Sialic Acid-Specific Lectin in the Hemolymph of the Banana Shrimp, Penaeus (Fenneropenaeus) merguiensis
نویسندگان
چکیده
A lectin from the hemolymph of the banana shrimp Penaeus (Fenneropenaeus) merguiensis expressed higher agglutination activity against rabbit erythrocytes than those from human, and its activity was Cadependent. The hemagglutinating activity of the hemolymph lectin was stable up to 55 C and optimal at pH 7.5-8.0. N-acetylated sugars, ManNAc, GlcNAc, GalNAc, and NeuNAc, were effective inhibitors of the lectin induced hemagglutinating activity, with NeuNAc being the most powerful. Porcine stomach mucin and fetuin showed high inhibitory activity to the hemolymph lectin-induced hemagglutination. In addition, the hemolymph lectin selectively agglutinated Vibrio harveyi and V. parahemolyticus, which are pathogenic to P. merguiensis, and to a lesser extent, V. vulnificus, but had no effect on the non-pathogenic V. cholerae, Samonella typhi and Escherichia coli. This observation suggests that lectin present in the hemolymph of P. merguiensis may contribute to the defense mechanism of this species against bacterial infections.
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