کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5804611 | 1555707 | 2012 | 9 صفحه PDF | دانلود رایگان |
In a previous study, we identified an aspartic protease gene (Ts-Asp) from the Trichinella spiralis muscle stage larva cDNA library. The gene sequence of Ts-Asp was 1281Â bp long and was found to encode a protein consisting of 405 amino acids, with a molecular mass of 45.248Â kD and a pI of 5.95. The deduced Ts-Asp has a conserved catalytic motif with catalytic aspartic acid residues in the active site, a common characteristic of aspartic proteases. In addition, the deduced amino acid sequence of Ts-Asp was found to possess significant homology (above 50%) with aspartic proteases from nematode parasites. Results of phylogenetic analysis indicated a close relationship of Ts-Asp with cathepsin D aspartic proteases. For production of recombinant Ts-Asp (rTs-Asp), the pGEX4T expression system was used. Like other proteases, the purified rTs-Asp was able to digest collagen matrix in vitro. Abundant expression of Ts-Asp was observed in muscle stage larva. Ts-Asp was detected in ES proteins, and was able to elicit the production of specific antibodies. It is the first report of molecular characterization of aspartic protease isolated from T. spiralis.
Journal: Veterinary Parasitology - Volume 190, Issues 3â4, 21 December 2012, Pages 510-518