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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Characterization of endonuclease activity from excretory/secretory products of a parasitic nematode, Trichinella spiralis.

Double-stranded endonuclease activity was demonstrated for the first time in the excretory/secretory (ES) products of a parasitic nematode, Trichinella spiralis, which can reorganize host muscle cells. The endonuclease introduced double-stranded breaks to the native DNA. The ES double-stranded endonuclease(s) was sequence nonspecific, with a pH optimum below 6, and required divalent cations as a cofactor. Its activity was inhibited by the Zn2+ ion. It was detected mainly in the ES products of the infective-stage larvae of T. spiralis collected at 37 degrees C and was present in much smaller amounts in samples collected at 43 degrees C and in the products of T. pseudospiralis, a nonencapsulated species. The activity of endonuclease was blocked by antibodies against ES products. Zymographic analysis showed that the endonuclease activity was associated with at least three molecular forms, designated approximately 25, 30 and 58 kDa, respectively.[1]


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