4.7 Article

Integrated Proteomics and Transcriptomics Analyses Reveals the Possible Antifungal Mechanism of an Indoloquinoline Alkaloid Neocryptolepine against Rhizoctonia solani

Journal

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 23, Pages 6455-6464

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c01385

Keywords

neocryptolepine; antifungal activity; Rhizoctonia solani; complex III; biofungicide

Funding

  1. National Natural Science Foundation of China [21877056, 21672092]
  2. National Key Research and Development Program of China [2017YFD0201404, 2016YFE0129000]
  3. Key Program for International S&T Cooperation Projects of China Gansu Province [18YF1WA115]
  4. Fundamental Research Funds for the Central Universities [lzujbky-2019-27]
  5. Natural Science Foundation of Gansu Province, China [20JR5RA216]

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Through proteomics and transcriptomics analysis, this study investigated the potential mode of action of neocryptolepine against Rhizoctonia solani. Results showed that neocryptolepine affected mitochondrial respiratory chain, leading to changes in oxidative phosphorylation and inhibition of complex III activity. The study identified a potential target, cytochrome b-c1 complex subunit Rieske, and demonstrated neocryptolepine's antifungal efficacy and ability to inhibit sclerotia formation in a concentration-dependent manner.
Rhizoctonia solani causes serious plant diseases. Neocryptolepine presented the significant antifungal activity against R. solani, however the mode of action is unclear. In this paper, we investigated the potential mode of action of neocryptolepine against R. solani integrated the proteomics and transcriptomics. Results showed that after treatment with neocryptolepine, 1012 differentially expressed proteins and 10 920 differentially expressed genes of R. solani were found, most of them were enriched in mitochondrial respiratory chain. It affected oxidative phosphorylation led to the enrichment of ROS and the decrease of MMP, and inhibited complex III activity with the inhibition rate of 63.51% at 10 mu g/mL. The mitochondrial structural and function were damaged. Cytochrome b-c1 complex subunit Rieske (UQCRFS1) with the high binding score to neocryptolepine was found as a potential target. In addition, it inhibited the sclerotia formation and presented antifungal efficacy by decreasing the diameter of a wound in potato in a concentration-dependent manner. Above results indicated that neocryptolepine inhibited the complex III activity by binding UQCRFS1 and blocked the ion transfer to cause the death of R. solani mycelia. This study laid the foundation for the future development of neocryptolepine as an alternative biofungicide.

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