Mitochondrial F1F0 ATP synthase (Complex V) (Complex V)

Mitochondrial F1F0 ATP synthase, commonly referred to as Complex V, is a sophisticated molecular machine located within the inner mitochondrial membrane that is essential for cellular energy homeostasis. It functions by utilizing the electrochemical proton gradient generated by the electron transport chain to catalyze the synthesis of adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and inorganic phosphate [1, 2]. The structure is composed of two main sectors: the membrane-embedded F0 domain, which facilitates proton translocation, and the matrix-exposed F1 domain, which contains the catalytic sites for ATP synthesis [3]. In addition to its primary bioenergetic role, the complex is a structural component of mitochondrial cristae and is implicated in the formation of the mitochondrial permeability transition pore (mPTP), a critical factor in apoptosis and necrosis [4]. Mutations in the genes encoding its subunits lead to severe mitochondrial diseases such as Leigh syndrome and NARP (neurogenic ataxia, retinitis pigmentosa) [5]. Therapeutically, it is targeted by various small molecules to modulate metabolic pathways in cancer or to combat bacterial infections by exploiting differences between human and microbial ATP synthases [6]. References: [1] Walker, J. E. (2013). Biochem Soc Trans. [2] UniProt (P06576). [3] Boyer, P. D. (1997). Annu Rev Biochem. [4] Giorgio, V., et al. (2013). Nature. [5] Kucharczyk, R., et al. (2009). BBA. [6] Andries, K., et al. (2005). Science.

Other names

ATP synthaseF1F0-ATPaseH+-transporting ATP synthaseMitochondrial ATP synthaseF-type ATPaseComplex V

Drugs targeting mitochondrial F1F0 ATP synthase typically act by binding to specific subunits within the F0 or F1 domains, thereby blocking the rotation of the enzyme or the flow of protons. This inhibition prevents the synthesis of ATP from ADP and inorganic phosphate, leading to a depletion of cellular energy and potentially triggering apoptosis or metabolic arrest [1, 3, 6].