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Iranian Journal of Biotechnology، جلد ۱۴، شماره ۲، صفحات ۵۰-۵۷
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عنوان انگلیسی Higher Expression Level and Lower Toxicity of Genetically Spliced Rotavirus NSP4 in Comparison to the Full-Length Protein in E. coli
چکیده انگلیسی مقاله Background: Rotavirus group A (RVA) is recognized as a major cause of severe gastroenteritis in children and new-born animals. Nonstructural protein 4 (NSP4) is responsible for the enterotoxic activity of these viruses in the villus epithelial cells. Amino acids 114-135 of NSP4 are known to form the diarrhea-inducing region of this viral enterotoxin. Therefore, developing an NSP4 lacking the enterotoxin domain could result in the introduction of a new subunit vaccine against rotaviruses in both humans and animals. Objectives: The aim of this study is the evaluation of rotavirus A NSP4 expression in E. coli expression system before and after removal of the diarrhea-inducing domain, which is the first step towards further immunological studies of the resulting protein. Materials and Methods: Splicing by overlap extension (SOEing) PCR was used to remove the diarrhea-inducing sequence from the NSP4 cDNA. Both the full-length (FL-NSP4) and the spliced (S-NSP4) cDNA amplicons were cloned into pET-32c and pGEX-6P-2. Expression levels of the recombinant proteins were evaluated in E. coli BL21 (DE3) by Western blot analysis. In addition, the toxicity of pET plasmids bearing the S-NSP4 and FL-NSP4 fragments was investigated by plasmid stability test. Results: For FL-NSP4, protein expression was detected for the strain containing the pGEX:FL-NSP4 plasmid, but not for the strain carrying pET:FL-NSP4. Hourly sampling up to 3 h showed that the protein production decreased by time. In contrast, expression of S-NSP4 was detected for pET:S-NSP4 strain, but not for pGEX:S-NSP4. Plasmid stability test showed that pET:S-NSP4 recombinant plasmid was almost stable, while pET:FL-NSP4 was unstable. Conclusions: This is the first report of production of rotavirus NSP4 lacking the diarrhea-inducing domain (S-NSP4). S-NSP4 shows less toxicity in this expression system and potentially could be a promising goal for rotavirus immunological and vaccine studies in the future.
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نویسندگان مقاله مهدی سهمانی |
department of clinical biochemistry and genetics, cellular and molecular research center, qazvin university of medical sciences, qazvin, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی قزوین (Qazvin university of medical sciences)

سیاوش آذری |
department of biotechnology, school of paramedical sciences, qazvin university of medical sciences, qazvin, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی قزوین (Qazvin university of medical sciences)

مجید تبیانیان |
department of biotechnology, razi vaccine and serum research institute, karaj, iran
سازمان اصلی تایید شده: موسسه تحقیقات واکسن و سرم سازی رازی (Razi vaccine and serum research institute)

نعمت اله غیبی |
cellular and molecular research center, qazvin university of medical sciences, qazvin, iran
سازمان اصلی تایید شده: دانشگاه علوم پزشکی قزوین (Qazvin university of medical sciences)

فرزانه پورعسگری |
department of biotechnology, razi vaccine and serum research institute, karaj, iran
سازمان اصلی تایید شده: موسسه تحقیقات واکسن و سرم سازی رازی (Razi vaccine and serum research institute)

نشانی اینترنتی http://www.ijbiotech.com/article_14131_65e0497ffe7341d2b06ce5bdb29b4acb.pdf
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