Microbial cell membrane and membrane transport systems

Microbial cell membranes and their associated transport systems are critical structures that maintain the physiological integrity and metabolic functions of bacteria, fungi, and protozoa (StatPearls, 2023). These membranes serve as a selective barrier, while transport systems like ABC transporters and efflux pumps regulate the movement of nutrients, ions, and waste products (PubMed, PMID: 25745872). In the context of infectious diseases, these systems are vital for pathogen survival and are frequently involved in antimicrobial resistance by actively pumping out antibiotics (NIH, 2021). Therapeutic agents such as polymyxins and daptomycin target the physical structure of the membrane to cause leakage and cell death, while others like azoles target the biosynthetic pathways of membrane components (PubChem). However, the similarity between certain microbial and host membrane components can lead to significant toxicity, such as nephrotoxicity, making the development of highly selective membrane-targeting drugs a major challenge (PubMed, PMID: 28214562). This target entry is considered a broad category or system rather than a single specific molecular target.

Other names

Bacterial cell membraneFungal cell membraneMicrobial membrane transportersEfflux pumpsSolute carrier proteinsABC transportersRND-family efflux systems

Drugs targeting these systems typically act by disrupting membrane integrity through detergent-like effects (e.g., polymyxins), forming ion-conducting pores (e.g., amphotericin B), inhibiting the synthesis of essential membrane lipids like ergosterol (e.g., azoles), or blocking efflux pumps to restore antibiotic sensitivity (PubMed, PMID: 30245130; StatPearls, 2023).