Pyrokinin receptor (PKR)

The Pyrokinin receptor (PKR), also known as the Pheromone Biosynthesis-Activating Neuropeptide receptor (PBANR), is a Class A (Rhodopsin-like) G protein-coupled receptor (GPCR) found predominantly in arthropods [1]. It is activated by a family of neuropeptides characterized by a conserved C-terminal FXPRL-amide (Phe-X-Pro-Arg-Leu-NH2) motif [2]. The receptor is fundamental to insect physiology, regulating crucial life-cycle events such as the synthesis of sex pheromones in moths, the induction of embryonic diapause in silkworms, and the regulation of visceral muscle contractions and pupariation in various fly species [3, 4].\n\nIn the field of biotechnology and pest management, the Pyrokinin receptor is a prominent target for the development of "green" pesticides and biostable peptidomimetics designed to disrupt insect reproduction and development [5]. Although the receptor is not a direct human therapeutic target, it is evolutionarily related to the vertebrate Neuromedin U receptors (NMUR1 and NMUR2), which are involved in regulating energy balance and smooth muscle contraction [6]. Research focuses on developing highly selective agonists and antagonists that can penetrate the insect cuticle or be delivered through ingestion while avoiding toxicity to non-target organisms like honeybees [7, 8]. The primary mechanism of action involves the induction of intracellular calcium signaling upon ligand binding, which translates extracellular peptide signals into vital physiological shifts [9].

Other names

Pheromone biosynthesis-activating neuropeptide receptorPBAN receptorPBANRDiapause hormone receptorDH-PBAN receptorFXPRL-amide receptor

Activation of the G protein-coupled receptor leads to the mobilization of intracellular calcium or modulation of cyclic AMP levels, triggering downstream physiological responses such as pheromone release or muscle contraction.