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The Journal of Immunology, Vol 137, Issue 9 2913-2917, Copyright © 1986 by American Association of Immunologists
ARTICLES |
NR Slifman, DA Loegering, DJ McKean and GJ Gleich
The eosinophil granule contains a series of basic proteins, including major basic protein, eosinophil peroxidase, eosinophil-derived neurotoxin (EDN), and eosinophil cationic protein (ECP). Both EDN and ECP are neurotoxins and helminthotoxins. Comparison of the partial N- terminal amino acid sequences of EDN and ECP showed 67% identity; surprisingly, they also showed structural homology to pancreatic ribonuclease (RNase). Therefore, we determined whether EDN and ECP possess RNase enzymatic activity. By spectrophotometric assay of acid soluble nucleotides formed from yeast RNA, purified EDN showed RNase activity similar to bovine pancreatic RNase, whereas ECP was 50 to 100 times less active. The RNase activity associated with ECP was not significantly inhibited after exposure of ECP to polyclonal or monoclonal antibody to EDN. These results indicate that EDN and ECP both possess RNase activity, the RNase activity of EDN and ECP is specific, and EDN and ECP have maintained not only structural but also functional homology to pancreatic RNase.
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