Bacterial efflux pump protein

Bacterial efflux pump proteins are a diverse group of transmembrane transporters that actively export a wide range of substrates, including antibiotics, biocides, and toxic substances, from the bacterial cytoplasm to the external environment[1][2][3][6][7]. They use either ATP hydrolysis (in the case of ABC transporters) or proton/sodium gradients (in MFS, RND, SMR, and MATE superfamilies) as energy sources[1][2][6]. Seen as a principal mechanism of multidrug resistance, these systems reduce intracellular concentrations of various antibacterial agents, leading to ineffective therapy and the spread of resistant pathogens[2][3][7]. Efflux pumps also contribute to bacterial virulence and stress adaptation, and are present in most bacteria, forming a significant portion of all bacterial transporters[6]. While currently no efflux pump inhibitors are clinically approved, several compounds and molecules—including verapamil, ABI-PP, certain natural products, and nanoparticles—are being explored to block these pumps and restore antibiotic efficacy[1][3]. The term "bacterial efflux pump protein" is generic and refers to a class or family of proteins, not a specific molecule; therefore, it is important for structured data applications to specify which efflux pump (e.g., AcrB, MexB, NorA, etc.) is under consideration in a given context[1][6][7].

Other names

Efflux pumpMultidrug efflux pumpBacterial multidrug transporterAntibiotic efflux pump

Drug efflux (export); Inhibition of efflux to restore antibiotic potency