Nep1-like proteins as a target for plant pathogen control

Area of Science:

• Plant Pathology
• Biochemistry
• Agrochemical Research

Background:

• Crop diseases cause significant economic losses and threaten global food security.
• Necrosis- and ethylene-inducing peptide 1-like proteins (NLPs) are key virulence factors secreted by microbial plant pathogens.
• NLPs are cytotoxic to eudicot plants, disrupting the plasma membrane via sphingolipid receptors.

Purpose of the Study:

• To identify small molecules that bind to NLPs from Pythium aphanidermatum and Phytophthora parasitica.
• To evaluate the potential of these compounds as novel phytopharmaceutical agents.

Main Methods:

• Screening of 587 small molecules using surface plasmon resonance (SPR) to assess binding affinity to NLPs.
• Inhibition assays of NLP-mediated necrosis in tobacco and pathogen growth on potato leaves.
• Structural analysis using saturation transfer difference-nuclear magnetic resonance (STD-NMR) and molecular modeling.

Main Results:

• Several compounds showed high affinity for NLPs.
• The most effective compounds inhibited NLP-mediated necrosis and pathogen growth.
• Anthranilic acid derivative demonstrated stable binding to NLPs, reducing necrotic activity and ion leakage.

Conclusions:

• NLPs are a viable target for developing novel phytopharmaceutical agents.
• Identified compounds serve as lead structures for optimizing antimicrobial products.
• Interfering with NLP function offers a strategy for crop disease management.