Proteome analysis of walnut bacterial blight disease

Cíntia H.D. Sagawa, Renata de A.B. Assis, Paulo A. Zaini, Phillip A. Wilmarth, Brett S. Phinney, Leandro M. Moreira, Abhaya M. Dandekar

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The interaction between the plant host, walnut (Juglans regia; Jr), and a deadly pathogen (Xanthomonas arboricola pv. juglandis 417; Xaj) can lead to walnut bacterial blight (WB), which depletes walnut productivity by degrading the nut quality. Here, we dissect this pathosystem using tandem mass tag quantitative proteomics. Walnut hull tissues inoculated with Xaj were compared to mock-inoculated tissues, and 3972 proteins were identified, of which 3296 are from Jr and 676 from Xaj. Proteins with differential abundance include oxidoreductases, proteases, and enzymes involved in energy metabolism and amino acid interconversion pathways. Defense responses and plant hormone biosynthesis were also increased. Xaj proteins detected in infected tissues demonstrate its ability to adapt to the host microenvironment, limiting iron availability, coping with copper toxicity, and maintaining energy and intermediary metabolism. Secreted proteases and extracellular secretion apparatus such as type IV pilus for twitching motility and type III secretion effectors indicate putative factors recognized by the host. Taken together, these results suggest intense degradation processes, oxidative stress, and general arrest of the biosynthetic metabolism in infected nuts. Our results provide insights into molecular mechanisms and highlight potential molecular tools for early detection and disease control strategies.

Original languageEnglish (US)
Article number7453
Pages (from-to)1-23
Number of pages23
JournalInternational journal of molecular sciences
Issue number20
StatePublished - Oct 2 2020


  • Adaptation
  • Disease susceptibility
  • Fruit
  • LC-MS/MS
  • Proteomics
  • Virulence
  • Walnut blight
  • Xanthomonas

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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