Abstract
Royalisin is a 5.5-kDa antibacterial peptide isolated from the royal jelly of the honeybee (Apis mellifera). The antimicrobial activity of royalisin against fungi, Gram-positive and Gram-negative bacteria has been revealed. Compared with another insect antibacterial peptide, there is an extra stretch of 11 amino acid residues at the C-terminus of royalisin. In this study, a recombinant shortened form of royalisin named as royalisin-D, was constructed without the 11 amino acid residues at the C-terminal of royalisin and linked to the C-terminal of oleosin by an inteinS fragment. The recombinant protein was overexpressed in Escherichia coli, purified by artificial oil body system and subsequently released through self-splicing of inteinS induced by the changes of temperature. The antibacterial activity of royalisin-D was compared with royalisin via minimal inhibitory concentration (MIC) assay, minimal bactericidal concentration (MBC) assay, microbial adhesion to solvents (MATS) methods, and cell membrane permeability. Furthermore, the recombinant royalisin and royalisin-D have also been treated with the reducing agent of disulfide bonds, dithiothreitol (DTT), to investigate the importance of the intra-disulfide bond in royalisin....Continue Reading
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