Jaburetox: update on a urease-derived peptide

Area of Science:

• Biochemistry and Molecular Biology
• Plant Science
• Pest Management

Background:

• Urease enzymes, first crystallized in 1926, possess diverse biological activities beyond urea hydrolysis.
• A specific ~11 kDa internal peptide within urease exhibits inherent toxicity to insects and fungi.
• Recombinant jaburetox (JBTX) was developed from the jbureII gene as a model for this toxic peptide.

Purpose of the Study:

• To review and characterize the biological activities of jaburetox (JBTX).
• To explore JBTX's potential applications in pest control, antifungal strategies, and bacterial inhibition.
• To assess JBTX's efficacy in protecting transgenic crops against insect pests.

Main Methods:

• Insecticidal assays using *Aedes aegypti* larvae and *Triatoma infestans* bugs.
• Antifungal activity testing against various fungal species.
• Bacterial growth inhibition assays with *E. coli*, *P. aeruginosa*, and *B. cereus*.
• Liposome interaction studies using Small Angle X-ray Scattering (SAXS).
• Development of JBTX-encapsulated lipid nanoparticles.
• Generation of transgenic tobacco and sugarcane plants expressing JBTX.

Main Results:

• JBTX demonstrated significant insecticidal activity against mosquito larvae and kissing bugs.
• JBTX effectively inhibited the growth of tested bacterial strains (*E. coli*, *P. aeruginosa*, *B. cereus*).
• SAXS studies revealed JBTX's ability to reorganize lipid bilayers in liposomes.
• Encapsulation of JBTX in lipid nanoparticles enhanced its antifungal efficacy.
• Transgenic plants expressing JBTX exhibited increased resistance to major insect pests.

Conclusions:

• Jaburetox (JBTX) is a versatile peptide with broad-spectrum insecticidal, fungicidal, and antibacterial properties.
• JBTX shows potential for agricultural applications, including crop protection through transgenic approaches.
• Further research is warranted to fully characterize JBTX's mechanisms and optimize its applications.