Varroa destructor octopamine-tyramine receptor (VdOct-TyrR) (VdOct-TyrR)

The Varroa destructor octopamine-tyramine receptor is a G protein-coupled receptor (GPCR) that is vital for the physiological and neurological regulation of the Varroa mite, the most significant parasitic threat to honey bee (Apis mellifera) colonies globally (Blenau et al., 2012). This receptor is activated by the biogenic amines octopamine and tyramine, which act as the invertebrate functional analogues of vertebrate norepinephrine, controlling essential functions such as movement, metabolism, and host-seeking behavior (Gross et al., 2017). Because of its critical role in mite survival and its distinct pharmacological properties, it serves as a primary target for chemical control agents, most notably the formamidine acaricide amitraz. Amitraz, through its active metabolite DPMF, acts as a potent agonist that overstimulates the receptor, leading to the mite's detachment from the host and subsequent death (Ozoe, 2013). Research into this receptor's signaling and structure is essential for developing new, selective acaricides that can overcome existing resistance mechanisms while ensuring the safety of the honey bee hosts.

Other names

Varroa destructor tyramine receptorVdTyrRVdOctopamine receptorOctopamine/tyramine receptorType 1 tyramine receptor

The receptor functions as a G protein-coupled mediator that, when bound by agonists such as the amitraz metabolite DPMF, stimulates intracellular signaling pathways—primarily the activation of adenylyl cyclase to increase cAMP levels—leading to neuronal overstimulation, behavioral disruption, and eventual death of the mite (Gross et al., 2017; Blenau et al., 2012).