Molecular cloning and phylogenetic analysis of Clonorchis sinensis elongation factor-1 alpha
- Authors
- Kim, Tae Yun; Cho, Pyo Yun; Na, Jong Won; Hong, Sung-Jong
- Issue Date
- Nov-2007
- Publisher
- SPRINGER
- Citation
- PARASITOLOGY RESEARCH, v.101, no.6, pp 1557 - 1562
- Pages
- 6
- Journal Title
- PARASITOLOGY RESEARCH
- Volume
- 101
- Number
- 6
- Start Page
- 1557
- End Page
- 1562
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/23916
- DOI
- 10.1007/s00436-007-0676-7
- ISSN
- 0932-0113
1432-1955
- Abstract
- Elongation factor-1 (EF-1) plays a primary role in protein synthesis, e.g., in the regulation of cell growth, aging, motility, embryogenesis, and signal transduction. The authors identified a clone CsIH23 by immunoscreening a Clonorchis sinensis cDNA library. The cDNA of CsIH23 was found to have a putative open reading frame containing 461 amino acids with a predicted molecular mass of 50.5 kDa. Its polypeptide sequence was highly homologous with EF-1 alpha of parasites and vertebrate animals. CsIH23 polypeptide contained three GTP/GDP-binding sites, one ribosome-binding domain, one actin-binding domain, one tRNA-binding domain, and two glyceryl-phosphoryl-ethanolamine attachment sites. Based on these primary and secondary structural similarities, it was concluded that CsIH23 cDNA encodes C. sinensis EF-1 alpha (CsEF-1 alpha). In a molecular phylogenic tree, CsEF-1 alpha clustered with the EF-1 alpha of helminthic parasites. Subsequently, CsEF-1 alpha recombinant protein was bacterially overexpressed and purified by Ni-NTA affinity column chromatography. Immunoblotting using CsEF-1 alpha recombinant protein produced positive signals for all serum samples tested from clonorchiasis, opisthorchiasis viverinii, and paragonimiasis westermani patients and normal healthy controls. These findings suggest that recombinant CsEF-1 alpha is of limited usefulness as serodiagnostic antigen for clonorchiasis.
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