Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Structure and Antibiotic Activity of Fragment Peptides of Antifungal Protein Isolated From Aspergillus giganteus

  • Shin, Song-Yub (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kang, Joo-Hyun (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Dong-Gun (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology) ;
  • Jin, Zhe-Zhu (Yanbian Medical College, Yanbian University) ;
  • Jang, So-Youn (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kim, Kil-Lyong (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology) ;
  • Hahm, Kyung-Soo (Peptide Engineering Research Unit, Korea Research Institute of Bioscience and Biotechnology)
  • Published : 1999.06.01
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Abstract

In order to determine the functional region of the antifungal protein (AFP) isolated from Aspergillus giganteus responsible for growth inhibitory activity and the promotion of phospholipid vesicle aggregation, overlapping peptides covering the complete sequence of AFP were synthesized. The antibiotic activity against bacterial, fungal, and tumor cells, and the vesicle-aggregation activity of the synthetic peptides were investigated. The AFP functional sequence responsible for antibiotic and vesicle-aggregation activity was determined to be located within the region between AFP residues 19 to 32. AFP (19-32) exhibited an a-helical conformation in a cell membrane-like environment. AFP (19-32) displayed potent antibiotic activity against bacterial, fungal, and tumor cells without peptide toxicity as indicated by hemolysis. Accordingly, AFP (19-32) could be used as a good model for the design of effective antibiotic agents with powerful antibiotic activity yet without any cytotoxic effects against the host organism.

Keywords

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