Microbial lipid bilayer

The **microbial lipid bilayer** refers to the double-layered structure of amphipathic lipids that forms the fundamental permeability barrier of bacterial, archaeal, and some eukaryotic microbial cells[1][3][5][7]. It consists primarily of phospholipids (such as phosphatidylglycerol, phosphatidylethanolamine, and cardiolipin) organized in two sheets with hydrophobic tails inward and hydrophilic heads outward[3][5][7]. The bilayer provides a selectively permeable barrier, supports the membrane potential, anchors proteins and receptors involved in transport and signaling, and, in bacteria, is a major determinant of sensitivity to antibiotics that act by membrane disruption such as polymyxins and daptomycin[5][7]. While it is a critical structural and functional element, it is not considered a single molecular "target" in the traditional sense (e.g., distinct receptor or enzyme), but rather a class of structures susceptible to some drugs[3]. Modifications, such as changes in lipid composition or biophysical properties, play a key role in microbial resistance to environmental stress and antimicrobials[6][7]. Additional context: - **Not a single target:** "Microbial lipid bilayer" does not refer to a single protein or small molecule entity but broadly encompasses the entire lipid-based membrane structure[1][3]. - **Therapeutic targeting:** Some antimicrobial drugs act directly on the membrane, but specificity and toxicity are notable challenges, as human cellular membranes have similar structural features, particularly in the case of polymyxins[5][7]. - **Aliases:** Commonly referred to as "bacterial membrane," "bacterial lipid bilayer," or "microbial membrane"[5][7]. **Summary:** "Microbial lipid bilayer" is not a discrete, canonical drug target like a defined protein or receptor; it is a structural feature of all microbes and serves as a physicochemical barrier and site of antimicrobial drug action, but it does not have an official abbreviation or specific alias signifying a unique molecular target[1][3][7].

Other names

Bacterial membrane lipid bilayerMicrobial membranebacterial membranebacterial lipid bilayer

Disruption of membrane integrity (detergent-like effect); Increased membrane permeability leading to cell lysis; Formation of pores or channels; Binding to lipid A/LPS (for Gram-negative bacteria)