Marine Biotechnology

, 11:748 | Cite as

Myxinidin, A Novel Antimicrobial Peptide from the Epidermal Mucus of Hagfish, Myxine glutinosa L.

  • Sangeetha Subramanian
  • Neil W. Ross
  • Shawna L. MacKinnon
Original Article

Abstract

Fish epidermal mucus contains innate immune components that provide a first line of defense against various infectious pathogens. This study reports the bioassay-guided fractionation and characterization of a novel antimicrobial peptide, myxinidin, from the acidic epidermal mucus extract of hagfish (Myxine glutinosa L.). Edman sequencing and mass spectrometry revealed that myxinidin consists of 12 amino acids and has a molecular mass of 1,327.68 Da. Myxinidin showed activity against a broad range of bacteria and yeast pathogens at minimum bactericidal concentration (MBC) ranging from 1.0 to 10.0 µg/mL. Screened pathogens, Salmonella enterica serovar Typhimurium C610, Escherichia coli D31, Aeromonas salmonicida A449, Yersinia ruckeri 96-4, and Listonella anguillarum 02-11 were found to be highly sensitive to myxinidin at the MBC of 1.0–2.5 µg/mL; Staphylococcus epidermis C621 and yeast (Candida albicans C627) had an MBC of 10.0 µg/mL. The antimicrobial activity of myxinidin was found to be two to 16 times more active than a potent fish-derived antimicrobial peptide, pleurocidin (NRC-17), against most of the screened pathogens. The microbicidal activity of myxinidin was retained in the presence of sodium chloride (NaCl) at concentrations up to 0.3 M and had no hemolytic activity against mammalian red blood cells. These results suggest that myxinidin may have potential applications in fish and human therapeutics.

Keywords

Mucus Antimicrobial peptide Innate immunity Hagfish Myxinidin 

Notes

Acknowledgements

The authors would like to thank Mr. Eric MacKinnon (Cape Sable Island, NS) for providing the hagfishes; Ron Melanson for the help with sampling; Cheryl Craft and Dr. Roger Ebanks for assisting in the mucus extraction and antimicrobial assays used in this study; Elden Rowland for the assisting in the mass spectrometric analysis; and Drs. K. Vanya Ewart, Stewart Johnson, and Susan E. Douglas for providing the bacterial cultures. This research was funded by the National Research Council Canada and the Ford Foundation International Fellowship Program.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Sangeetha Subramanian
    • 1
    • 2
  • Neil W. Ross
    • 1
    • 3
  • Shawna L. MacKinnon
    • 1
  1. 1.Institute for Marine BiosciencesNational Research CouncilHalifaxCanada,
  2. 2.Department of BiologyDalhousie UniversityHalifaxCanada,
  3. 3.Industrial Research Assistance ProgramNational Research CouncilHalifaxCanada,

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