Effects of antifungal peptide P-1 from Bacillus pumilus HN-10 on cell membrane structure and ROS metabolism of Trichothecium roseum

  • WU Shujuan ,
  • YUN Jianmin ,
  • WANG Rui ,
  • HE Kui ,
  • MAO Yongqiang ,
  • ZHAO Fengyun ,
  • ZHANG Wenwei ,
  • AI Duiyuan
Expand
  • (College of Food Science and Engineering,Gansu Agricultural University,Lanzhou 730070,China)

Received date: 2021-03-11

  Revised date: 2021-04-07

  Online published: 2021-12-31

Abstract

This study explored the effects of antifungal peptide P-1 from Bacillus pumilus HN-10 on cell membrane structure and reactive oxygen species (ROS) metabolism of T. roseum. The inhibitory effect of antifungal P-1 on the growth of T. roseum was investigated by plate cultivation (Oxford cup method) and liquid cultivation system, and the effect of antifungal P-l on the cell membrane structure of T. roseum in liquid cultivation within 12 h was dynamically observed by propidiumiodide and transmission electron microscope. The influence of antifungal P-1 on membrane permeability was analyzed by liquid cultivation system, and based on membrane lipid peroxidation, the effect of antifungal P-l on ROS and its metabolite malondialdehyde (MDA) was studied. The results showed that the growth of T. roseum spores was obviously inhibited by solid and liquid cultivation. With the extension of treatment time of antifungal peptide P-1, the number of T. roseum spores increased gradually. The treatment of antifungal peptide P-1 caused local damage to the spore wall and membrane structure of T. roseum, appeared some gaps and lead to massive outflow of cytoplasm and deformation of spores. The treatment of antifungal P-1 treatment reduced the ergosterol content of the mycelium, and it was 35% lower than the control group on 7th day. At the same time, the treatment of antifungal P-1 treatment significantly increased the uptake rate of N-phenyl-1-naphthylamine, relative conductivity. It was 24%, 35% higher than that of the control group on 7th day, respectively. In addition, intracellular ·O-2 was significantly increased by P-1 treatment (P<0.05), disrupted the balance of cellular antioxidant (SOD, CAT, POD) systems, aggravated lipid peroxidation and protein carbonylation, increased MDA content,and finally inhibited mycelium growth.

Cite this article

WU Shujuan , YUN Jianmin , WANG Rui , HE Kui , MAO Yongqiang , ZHAO Fengyun , ZHANG Wenwei , AI Duiyuan . Effects of antifungal peptide P-1 from Bacillus pumilus HN-10 on cell membrane structure and ROS metabolism of Trichothecium roseum[J]. Food and Fermentation Industries, 2021 , 47(23) : 83 -90 . DOI: 10.13995/j.cnki.11-1802/ts.027300

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