
Conjugation with Acridines Turns Nuclear Localization Sequence into Highly Active Antimicrobial Peptide
Wei Zhang, Xiaoli Yang, Jingjing Song, Xin Zheng, Jianbo Chen, Panpan Ma, Bangzhi Zhang, Rui Wang
Engineering ›› 2015, Vol. 1 ›› Issue (4) : 500-505.
Conjugation with Acridines Turns Nuclear Localization Sequence into Highly Active Antimicrobial Peptide
The emergence of multidrug-resistant bacteria creates an urgent need for alternative antibiotics with new mechanisms of action. In this study, we synthesized a novel type of antimicrobial agent, Acr3-NLS, by conjugating hydrophobic acridines to the N-terminus of a nuclear localization sequence (NLS), a short cationic peptide. To further improve the antimicrobial activity of our agent, dimeric (Acr3-NLS)2 was simultaneously synthesized by joining two monomeric Acr3-NLS together via a disulfide linker. Our results show that Acr3-NLS and especially (Acr3-NLS)2 display significant antimicrobial activity against gram-negative and gram-positive bacteria compared to that of the NLS. Subsequently, the results derived from the study on the mechanism of action demonstrate that Acr3-NLS and (Acr3-NLS)2 can kill bacteria by membrane disruption and DNA binding. The double targets–cell membrane and intracellular DNA–will reduce the risk of bacteria developing resistance to Acr3-NLS and (Acr3-NLS)2. Overall, this study provides a novel strategy to design highly effective antimicrobial agents with a dual mode of action for infection treatment.
acridine / nuclear localization sequence / conjugate / antimicrobial activity / mechanism of action
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