Bioactive molecules released by Heterorhabditis bacteriophora in response to various activation materials

ŠREIBR, Sara, Jana ILGOVÁ, Pavel DOBEŠ, Jiří VOREL, Jacek MARCINIAK, Jana HURYCHOVÁ, Martin KAŠNÝ and Pavel HYRŠL. Bioactive molecules released by Heterorhabditis bacteriophora in response to various activation materials. In Virtual Nematology Conference 2023. 2023.

Basic information

• Original name: Bioactive molecules released by Heterorhabditis bacteriophora in response to various activation materials
• Name in Czech: Bioaktivní molekuly uvolňované Heterorhabditis bacteriophora v reakci na různé aktivační materiály
• Authors: ŠREIBR, Sara (276 Germany, belonging to the institution), Jana ILGOVÁ (703 Slovakia, belonging to the institution), Pavel DOBEŠ (203 Czech Republic, belonging to the institution), Jiří VOREL (203 Czech Republic, belonging to the institution), Jacek MARCINIAK (203 Czech Republic, belonging to the institution), Jana HURYCHOVÁ (203 Czech Republic, belonging to the institution), Martin KAŠNÝ (203 Czech Republic, belonging to the institution) and Pavel HYRŠL (203 Czech Republic, belonging to the institution).
• Edition: Virtual Nematology Conference 2023, 2023.

Other information

• Original language: English
• Type of outcome: Conference abstract
• Field of Study: 10616 Entomology
• Country of publisher: Czech Republic
• Confidentiality degree: is not subject to a state or trade secret
• RIV identification code: RIV/00216224:14310/23:00134270
• Organization unit: Faculty of Science
• Keywords (in Czech): Bioaktivní molekuly; Heterorhabditis bacteriophora; aktivace; aktivační materiály
• Keywords in English: Bioactive molecules; Heterorhabditis bacteriophora; activation; activation materials

Abstract

Entomopathogenic nematodes (EPNs) are obligate insect parasites commonly used in the biocontrol of many insect pests. They produce bioactive molecules referred to as excreted/secreted products (ESPs). The ESPs can interfere with the host immune system, increasing infection efficiency and chances of EPNs survival and reproduction. Therefore, understanding the composition and function of ESPs is vital for unraveling the mechanisms underlying nematode pathogenicity and improving their efficient usage as biocontrol agents. Our aim was to assess the effect of various activation materials on the ESPs protein spectrum and to identify infection-specific molecules by comparison with the ESPs profiles of infective juveniles treated with water or phosphate buffer. Three activation materials prepared from larvae of Galleria mellonella, and two controls of water and phosphate buffer were used for the in vitro activation of Heterorhabditis bacteriophora infective juveniles. The produced ESPs were collected and subjected to LC-MS/MS analysis using RSLCNano system on-line connected to Impact II Ultra-High Resolution Qq-Time-Of-Flight mass spectrometer. Protein searches were performed against a protein database derived from H. bacteriophora reference genome. LC-MS/MS results revealed significant variations in the composition of ESPs following activation with different materials. We identified several proteins, e.g. ShTK domain proteins, fatty acid- and retinoid- binding protein, recently associated with pathogenicity and immune modulation. The activation materials influenced the abundance and diversity of ESP components, suggesting that these materials may play a crucial role in modulating the nematode's virulence. This study was supported by grant GAČR 23-06457S.

Abstract (in Czech)

Entomopathogenic nematodes (EPNs) are obligate insect parasites commonly used in the biocontrol of many insect pests. They produce bioactive molecules referred to as excreted/secreted products (ESPs). The ESPs can interfere with the host immune system, increasing infection efficiency and chances of EPNs survival and reproduction. Therefore, understanding the composition and function of ESPs is vital for unraveling the mechanisms underlying nematode pathogenicity and improving their efficient usage as biocontrol agents. Our aim was to assess the effect of various activation materials on the ESPs protein spectrum and to identify infection-specific molecules by comparison with the ESPs profiles of infective juveniles treated with water or phosphate buffer. Three activation materials prepared from larvae of Galleria mellonella, and two controls of water and phosphate buffer were used for the in vitro activation of Heterorhabditis bacteriophora infective juveniles. The produced ESPs were collected and subjected to LC-MS/MS analysis using RSLCNano system on-line connected to Impact II Ultra-High Resolution Qq-Time-Of-Flight mass spectrometer. Protein searches were performed against a protein database derived from H. bacteriophora reference genome. LC-MS/MS results revealed significant variations in the composition of ESPs following activation with different materials. We identified several proteins, e.g. ShTK domain proteins, fatty acid- and retinoid- binding protein, recently associated with pathogenicity and immune modulation. The activation materials influenced the abundance and diversity of ESP components, suggesting that these materials may play a crucial role in modulating the nematode's virulence. This study was supported by grant GAČR 23-06457S.

Links

• GA23-06457S, research and development project: Name: Identifikace a funkční charakteristika bioaktivních molekul produkovaných entomopatogenními hlísticemi

Investor: Czech Science Foundation, Identification and functional characterization of bioactive molecules produced by entomopathogenic nematodes