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Cloning of a Fibrinolytic Enzyme (Subtilisin) Gene From Bacillus subtilis in Escherichia coli

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Abstract

Several investigations are being pursued to enhance the efficacy and specificity of fibrinolytic therapy. In this regard, microbial fibrinolytic enzymes attracted much more medical interests during these decades. Subtilisin, a member of subtilases (the superfamily of subtilisin-like serine proteases) and also a fibrinolytic enzyme is quite common in Gram-positive bacteria, and Bacillus species stand out in particular, as many extracellular and even intracellular variants have been identified. In the present work, the subtilisin gene from Bacillus subtilis PTCC 1023 was cloned into the vector pET-15b and expressed in Escherichia coli strain BL21 (DE3). Total genomic DNA were isolated and used for PCR amplification of the subtilisin gene by means of the specific primers. SDS-PAGE and enzyme assay were done for characterizing the expressed protein. A ~1,100 bp of the structural subtilisin gene was amplified. The DNA and amino acid sequence alignments resulting from the BLAST search of subtilisin showed high sequence identity with the other strains of B. subtilis, whereas significantly lower identity was observed with other bacterial subtilisins. The recombinant enzyme had the same molecular weight as other reported subtilisins and the E. coli transformants showed high subtilisin activity. This study provides evidence that subtilisin can be actively expressed in E. coli. The commercial availability of subtilisin is of great importance for industrial applications and also pharmaceutical purposes as thrombolytic agent. Thus, the characterization of new recombinant subtilisin and the development of rapid, simple, and effective production methods are not only of academic interest, but also of practical importance.

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Acknowledgments

This study was supported by a grant from the Research Council of Shiraz University of Medical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran.

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Authors and Affiliations

  1. Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Shiraz University of Medical Sciences, Shiraz, Iran

    Younes Ghasemi, Fatemeh Dabbagh & Abdollah Ghasemian

  2. Pharmaceutical Sciences Research Center, Shiraz University of Medical Sciences, Shiraz, Iran

    Younes Ghasemi, Fatemeh Dabbagh & Abdollah Ghasemian

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  1. Younes Ghasemi
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  2. Fatemeh Dabbagh
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Correspondence to Younes Ghasemi.

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Ghasemi, Y., Dabbagh, F. & Ghasemian, A. Cloning of a Fibrinolytic Enzyme (Subtilisin) Gene From Bacillus subtilis in Escherichia coli . Mol Biotechnol 52, 1–7 (2012). https://doi.org/10.1007/s12033-011-9467-6

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