Calcineurin-mediated dephosphorylation of acetyl-coA carboxylase is required for PBAN-induced sex pheromone biosynthesis in Helicoverpa armigera [Research]

Chemical signaling plays a critical role in the behavior and physiology of many animals. Female insects, as a number of many other animals, release sex pheromones to attract males for mating. The evolutionary and ecological success of insects therefore hinges on their ability to precisely mediate (including initiation and termination) pheromone biosynthesis. Pheromone biosynthesis activating neuropeptide (PBAN) acts directly on pheromone glands to regulate sex pheromone production using Ca²⁺ and cyclic-AMP as secondary messengers in the majority of species. However, the molecular mechanism down-stream of the secondary messengers has not yet been elucidated in heliothine species. The present study shows that calcineurin, protein kinase A (PKA) and acetyl-coA carboxylase (ACC) are key components involved in PBAN-induced sex pheromone biosynthesis in Helicoverpa armigera using PBAN-dependent phosphoproteomics in combination with transcriptomics. RNAi-mediated knockdown and inhibitor assay demonstrated that calcineurin A is required for PBAN-induced ACC activation and sex pheromone production. Calcineurin-dependent phosphoproteomics and in vitro calcineurin phosphorylation assay further revealed that calcineurin regulated ACC activity by dephosphorylating ser84 and ser92. In addition, PKA-dependent phosphoproteomics and activity analysis revealed that PKA reduces the activity of AMP-activated protein kinase (AMPK), a negative regulator of ACC by phosphorylating the conserved ser92. Taken together, our findings indicate that calcineurin acts as the down-stream signal of PBAN/G-protein receptor/Ca²⁺ to activate ACC through dephosphorylation whilst inactivating AMPK via PKA to reduce ACC phosphorylation, thus facilitating calcineurin activation of ACC.

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