Pheromone biosynthesis in lepidoptera

Area of Science:

• Biochemistry
• Chemical Ecology
• Insect Physiology

Background:

• Lepidopteran species utilize unique chain-shortening and desaturase systems (Δ9, Δ10, Δ11) for pheromone production.
• In Tortricidae, pheromone components from Δ9 and Δ01 desaturases correlate with more primitive species.
• The final blend of Z and E acetates is regulated by the reduction sequence of acyl intermediates.

Purpose of the Study:

• To characterize the desaturase enzymes involved in lepidopteran pheromone biosynthesis.
• To investigate the regulatory sequence controlling the precise blend of pheromone components.
• To report initial purification of the Δ11 desaturase enzyme from the cabbage looper moth (Trichoplusia ni).

Main Methods:

• Analysis of desaturase systems in lepidopteran pheromone production.
• Correlation studies between desaturase activity and species morphology (plesiomorphies).
• Enzyme purification techniques, focusing on the Δ11 desaturase.

Main Results:

• Established correlations between desaturase types (Δ9, Δ01) and evolutionary primitiveness in Tortricidae.
• Identified the regulation of Z and E acetate blends in the final reduction sequence.
• Initiated the purification process for the Δ11 desaturase enzyme from cabbage looper moths.

Conclusions:

• Desaturase systems are crucial for pheromone diversity in Lepidoptera.
• Understanding these systems provides insights into insect evolution and chemical communication.
• The purification of Δ11 desaturase is a foundational step for further functional studies.