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Characterization of Antimicrobial Peptides Isolated from the Processing by-Products of African Catfish Clarias gariepinus

  • Tao Li
  • Xiaomei Wang
  • Yan Wang
  • Tianguo Fan
  • Yunxia Xu
  • Ze Fan
Article

Abstract

Antimicrobial peptides (AMPs) as components of innate immunity system have been isolated from fish and other species. In this study, the crude proteins extracted with gradient ammonium sulfate precipitation technique from the processing by-products of African catfish Clarias gariepinus (C. gariepinus) were purified by size-exclusion chromatography and all the four obtained fractions, Clarias antimicrobial peptides I(CAP-I), CAP-II, CAP-III and CAP-IV, showed antimicrobial activity. Among of these fractions, CAP-IV showed the highest antimicrobial activity against Staphylococcus aureus, Aeromonas sobria, Aeromonas hydrophila, Escherichia coli by agar diffusion plate test and the diameter of inhibition zone was 8.34, 9.27, 6.76, 6.13 mm, respectively. The molecular weight of main peptides of CAP-IV was around 4.1 KD by SDS-PAGE analysis. CAP-IV showed antimicrobial activity against both gram-negative and gram-positive bacterial pathogens at minimum inhibitory concentrations (MICs) ranging from 105 to 420 μg/mL. The antimicrobial activity of CAP-IV was stable at wide pH range, 3–11 and was also heat-stable when temperature was below 80 °C. Freeze-thawing treatment also only had slight effects on the antimicrobial activity of CAP-IV. Besides, CAP-IV was not sensitive to the hydrolysis by pepsin and trypsin, except for protease K. These results suggest that CAP-IV isolated from C. gariepinus is potential to be developed as a new antimicrobial peptide and may partially explain the high disease resistance of African catfish C. gariepinus.

Keywords

Antimicrobial peptides Clarias gariepinus Antimicrobial activity stability Minimal inhibitory concentrations 

Notes

Acknowledgments

This study was funded by the Science and Technology Planning Project of Tianjin (Grant No. 15JCZDJC33500), Foundation (No. 2015IM003) of Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education and Tianjin Key Lab of Industrial Microbiology (Tianjin University of Science & Technology) and the National Student Innovation Training Program (Grant No. 201510061094).

Compliance with Ethical Standards

Ethical Approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed and this article does not contain any studies with human participants performed by any of the authors.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Tao Li
    • 1
    • 2
    • 3
    • 4
  • Xiaomei Wang
    • 1
  • Yan Wang
    • 1
  • Tianguo Fan
    • 2
  • Yunxia Xu
    • 5
  • Ze Fan
    • 1
  1. 1.Tianjin Key Laboratory of Aqua-Ecology and Aquaculture, College of FisheriesTianjin Agricultural UniversityTianjinPeople’s Republic of China
  2. 2.Biosynthetic and Biopharmaceutical Research and Development Center, College of Basic ScienceTianjin Agricultural UniversityTianjinPeople’s Republic of China
  3. 3.Key Laboratory of Industrial Fermentation Microbiology (Tianjin University of Science & Technology)Ministry of EducationTianjinPeople’s Republic of China
  4. 4.Tianjin Key Lab of Industrial MicrobiologyTianjin University of Science and TechnologyTianjinPeople’s Republic of China
  5. 5.Tianjin Aquatic Animal Infectious Disease Control and Prevention CenterTjianjinPeople’s Republic of China

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