Publication details

Cystatin: the cysteine peptidase inhibitor from Eudiplozoon nipponicum (Monogenea)

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Year of publication 2015
Type Conference abstract
MU Faculty or unit

Faculty of Science

Description Eudiplozoon nipponicum (Monogenea, Diplozooidae) typically inhabiting the gills of carp (Cyprinus carpio) is widely distributed Eurasian blood-feeding ectoparasite. The foregoing research of diplozoid Monogenea has been predominatly oriented towards understanding morphology and ecology of particular species. Nevertheless there is a lack of information regarding functional molecules synthesized by this taxonomic group. Among important molecules of various parasitic species belong cystatins (inhibitors of cystein peptidases). Besides regulation of endogenous processes in parasite bodies they play a substantial role e.g. in manipulation of the host immune system and/or regulation of blood digestion process. The aim of our experimental work is to reveal the presence, structure and function of E. nipponicum cystatin DNA/protein molecules using bioinformatic, molecular and proteomic methods. The gene coding cystatin of E. nipponicum was expressed in heterologous E. coli (BL21) system using pET19b expression vector. IPTG induced expression (22 °C, 6 hours) was analyzed on SDS-PAGE and soluble recombinant cystatin of E. nipponicum was purified on Ni-NTA agarose column. Production of cystatin was verified by both mass spectrometry (Orbitrap) and Western Blot using His-tag specific antibodies. Activity of recombinant inhibitor was tested by inhibitory assay using recombinant E. nipponicum cathepsin L and fluorogenic substrate Z-FR-AMC. Soluble recombinant cystatin was used for immunization of ICR mice. The polyclonal anti-cystatin sera reacted specifically with the crude extract of E. nipponicum and recombinant cystatin of E. nipponicum (Western blot).
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