Abstract
Adenoregulin is a member of dermaseptin family which are vertebrate antibiotic peptides having lethal effects against a broad spectrum of bacteria, fungi and protozoa. The 99 bp adenoregulin gene was cloned in the expression vector pET32a and transformed into Escherichia coli BL21(DE3). In fed-batch cultivation of BL21(DE3)/pET32a-adr, an exponential feeding strategy was applied to gain 60 g dry cells l-1. The recombinant fusion protein Trx-ADR was expressed in a soluble form. The fusion protein was isolated by Ni2+-chelating chromatography, cleaved with CNBr and purified to homogeneity through reverse phase-HPLC and size exclusion-HPLC. The purified recombinant adenoregulin had antibacterial activity against Escherichia coli K12D31 with apparent Mr of 3.4 kDa, identical to the anticipated value.
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