Abstract
Mouse beta defensin-1 (mBD-1) is a cationic peptide with broad antimicrobial activity. The mBD-1 gene was cloned and fused with TrxA to construct pET32-mBD1, which was transformed into E. coli BL21 (DE3). The optimal expression conditions of fusion protein TrxA–mBD1 were: cultivation at 32°C in 2 × YT medium, induction with 0.2 mM isopropylthio-d-galactoside (IPTG), and post-induction expression for 8 h. The fusion protein was highly soluble (90.0%) and accounted for 65% of the total soluble protein; and its volumetric productivity reached 0.67 g/l, i.e., 0.14 g/l of recombinant mBD-1. At 5 μM, purified recombinant mBD-1 killed 50% of Candida albicans.
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