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Molecular Dynamics Simulation Studies of the Effects of the Protonation State of Chitosan in Interactions with Bacterial Membranes

키토산의 양성자화가 세균막과의 상호작용에 미치는 효과 연구

  • Truong, Gia Khuong (Interdisciplinary Program of Biomedical, Electrical and Mechanical Engineering, Pukyong National University) ;
  • Yi, Myunggi (Department of Biomedical Engineering, Pukyong National University)
  • Received : 2016.10.31
  • Accepted : 2016.12.05
  • Published : 2016.12.31

Abstract

The cationic biopolymer chitosan has several applications in medicine. Chitosan is the deacetylated derivative of chitin, the second most abundant naturally occurring polymer. Recent studies have investigated the relationship between chitosan and antibacterial activity. However, the molecular interactions and mechanisms have not been detailed. This study used molecular dynamics simulations to study interactions between chitosan and anionic bacterial membranes (POPE-POPG) and electrically neutral non-bacterial membranes (POPC). We calculated the free energy using umbrella sampling to compare the interactions between membranes and chitosan in different protonation states. Fully protonated chitosan interacted most strongly with the bacterial membranes, but weakly with non-bacterial membranes. These results suggest that electrostatic interactions are the main mechanism of the antibacterial activity of chitosan, and they provide insights into the design of novel antibacterial and antimicrobial agents.

Acknowledgement

Supported by : 부경대학교

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