Abstract
The full-length cDNA of a protease gene from a marine annelid Arenicola cristata was amplified through rapid amplification of cDNA ends technique and sequenced. The size of the cDNA was 936 bp in length, including an open reading frame encoding a polypeptide of 270 amino acid residues. The deduced amino acid sequnce consisted of pro- and mature sequences. The protease belonged to the serine protease family because it contained the highly conserved sequence GDSGGP. This protease was novel as it showed a low amino acid sequence similarity (< 40%) to other serine proteases. The gene encoding the active form of A. cristata serine protease was cloned and expressed in E. coli. Purified recombinant protease in a supernatant could dissolve an artificial fibrin plate with plasminogen-rich fibrin, whereas the plasminogen-free fibrin showed no clear zone caused by hydrolysis. This result suggested that the recombinant protease showed an indirect fibrinolytic activity of dissolving fibrin, and was probably a plasminogen activator. A rat model with venous thrombosis was established to demonstrate that the recombinant protease could also hydrolyze blood clot in vivo. Therefore, this recombinant protease may be used as a thrombolytic agent for thrombosis treatment. To our knowledge, this study is the first of reporting the fibrinolytic serine protease gene in A. cristata.
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Zhao, C., Ju, J. Cloning, expression and activity analysis of a novel fibrinolytic serine protease from Arenicola cristata . J. Ocean Univ. China 14, 533–540 (2015). https://doi.org/10.1007/s11802-015-2488-1
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DOI: https://doi.org/10.1007/s11802-015-2488-1