ArticleParasitology research2015
Identification and characterization of a member of Rab subfamily, Rab8, from Clonorchis sinensis.
Article in Parasitology research, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors at 4 institutions in 1 country.
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Abstract
The Rabs act as a binary molecular switch that utilizes the conformational changes associated with the GTP/GDP cycle to elicit responses from target proteins. It regulates a broad spectrum of cellular processes including cell proliferation, cytoskeletal assembly, and intracellular membrane trafficking in eukaryotes. The Rab8 from Clonorchis sinensis (CsRab8) was composed of 199 amino acids. The deduced amino acid sequence shared above 50% identities with other species from trematode, tapeworm, mammal, insecta, nematode, and reptile, respectively. The homologous analysis of sequences showed the conservative domains: G1 box (GDSGVGKS), G2 box (T), G3 box (DTAG), G4 box (GNKCDL), and G5 box. In addition, the structure modeling had also shown other functional domains: GTP/Mg(2+) binding sites, switch I region, and switch II region. A phylogenic tree analysis indicated that the CsRab8 was clustered with the Rab from Schistosoma japonicum, and trematode and tapeworm came from the same branch, which was different from an evolutional branch built by other species, such as mammal animal, insecta, nematode, and reptile. The recombinant CsRab8 protein was expressed in Escherichia coli and the purified protein was a soluble molecule by 12% sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis. CsRab8 was identified as a component of excretory/secretory products of C. sinensis by western blot analysis. The transcriptional level of CsRab8 at metacercaria stage was the highest at the four stages and higher by 56.49-folds than that at adult worm, 1.23-folds than that at excysted metacercaria, and 2.69-folds than that at egg stage. Immunohistochemical localization analysis showed that CsRab8 was specifically distributed in the tegument, vitellarium, eggs, and testicle of adult worms, and detected on the vitellarium and tegument of metacercaria. Combined with the results, CsRab8 is indispensable for survival and development of parasites, especially for regulating excretory/secretory products secretion.
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