Plasmodium falciparum adenylyl cyclase G (PfACG)

Plasmodium falciparum adenylyl cyclase G (PfACG) is a unique, pH-sensitive enzyme that plays a critical role in the life cycle of the malaria parasite (UniProt: Q8I5V8) [1]. Unlike mammalian adenylyl cyclases, PfACG is specifically activated by changes in environmental pH, serving as a molecular sensor that triggers essential developmental transitions as the parasite moves between the mosquito and human hosts (PubMed: 22493498) [3]. It is highly expressed in sporozoites and gametocytes, where it regulates cAMP signaling pathways necessary for parasite motility, infectivity, and the germination of oocysts (PubMed: 15590657) [2]. Specifically, PfACG is vital for the activation of gametocytes in the mosquito midgut and the infectivity of sporozoites during the transition from the mosquito salivary glands to the human liver (PlasmoDB: PF3D7_1440100) [4]. Because PfACG possesses a distinct structure and regulatory mechanism compared to human adenylyl cyclases, it is considered a high-priority target for the development of transmission-blocking drugs and vaccines. Inhibiting this enzyme disrupts the parasite's ability to sense and respond to its environment, effectively halting its progression and preventing the spread of malaria.

Other names

PfACGPfACG1Adenylyl cyclase GAdenylate cyclase GpH-sensitive adenylyl cyclasePF3D7_1440100PF14_0411

Inhibition of adenylyl cyclase enzymatic activity, which prevents the conversion of ATP to cAMP, thereby disrupting pH-dependent signaling pathways essential for parasite development (PubMed: 22493498) [3].