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Discovery and identification of antimicrobial peptides in Sichuan pepper (Zanthoxylum bungeanum Maxim) seeds by peptidomics and bioinformatics

  • Xiaoyan Hou
  • Shanshan Li
  • Qingying Luo
  • Guanghui Shen
  • Hejun Wu
  • Meiliang Li
  • Xingyan Liu
  • Anjun Chen
  • Meng Ye
  • Zhiqing ZhangEmail author
Biotechnologically relevant enzymes and proteins

Abstract

Antimicrobial peptides (AMPs) have generated growing attention because of the increasing bacterial resistance. However, the discovery and identification of AMPs have proven to be challenging due to the complex purification procedure associated with conventional methods. For the reasons given above, it is necessary to explore more efficient ways to obtain AMPs. We established a new method for discovery and identification of novel AMPs by proteomics and bioinformatics from Zanthoxylum bungeanum Maxim seeds protein hydrolysate directly. This process was initially achieved by employing ultra-performance liquid chromatography-electrospray ionization-mass spectrometry/mass (UPLC-ESI-MS/MS) spectrometry to identify peptides derived from Z. bungeanum Maxim seed protein hydrolysates. Three online servers were introduced to predict potential AMPs. Sixteen potential AMPs ranging from 1.5 to 2.7 kDa were predicted and chemically synthesized, one of which, designated NP-6, inhibited activity against all the tested strains according to antimicrobial assay. Time-killing assay indicated that NP-6 could quickly kill almost all the Escherichia coli within 180 min and Staphylococcus aureus at 360 min. Moreover, the simulation 3D structure of NP-6 was consisted of α-helix and random coil, and this was verified by circular dichroism (CD) spectra. At last, the scanning electron microscope (SEM) images of E. coli and S. aureus treated by NP-6 demonstrated that NP-6 had a significant effect on bacteria cell morphology. Our findings provide an efficient approach for discovery of AMPs, and Z. bungeanum Maxim seeds may be a nature resource to extract antimicrobial agents.

Keywords

Zanthoxylum bungeanum Maxim seeds Antimicrobial peptides Prediction Peptidomics Bioinformatics 

Notes

Funding information

All the authors are grateful to the Scientific Fund of the Application Fundamental Project [2016-JY-0118] and the Key Project of Research and Development Program [18ZDYF1175], the Science and Technology Department of Sichuan Province for the financial assistance in this study.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals by any of the authors.

Supplementary material

253_2018_9593_MOESM1_ESM.pdf (245 kb)
ESM 1 (PDF 245 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Xiaoyan Hou
    • 1
  • Shanshan Li
    • 1
  • Qingying Luo
    • 1
  • Guanghui Shen
    • 1
  • Hejun Wu
    • 1
  • Meiliang Li
    • 1
  • Xingyan Liu
    • 1
  • Anjun Chen
    • 1
  • Meng Ye
    • 2
  • Zhiqing Zhang
    • 1
    Email author
  1. 1.College of Food ScienceSichuan Agricultural UniversityYa’anChina
  2. 2.Collge of ForestrySichuan Agricultural UniversityChengduChina

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