Bacterial surface molecules

Bacterial surface molecules represent a heterogeneous group of structural and functional entities that constitute the bacterial cell envelope and its appendages. This category includes peptidoglycan, lipopolysaccharides (LPS), teichoic acids, surface proteins such as adhesins and invasins, and capsular polysaccharides (Silhavy et al., 2010, Cold Spring Harb Perspect Biol). These molecules are essential for maintaining osmotic stability, mediating interactions with the host environment, and facilitating nutrient uptake. From a therapeutic perspective, they are among the most successful drug targets; for instance, beta-lactam antibiotics inhibit the synthesis of the peptidoglycan layer, while polymyxins target the LPS of Gram-negative bacteria (Sarkar et al., 2021, Molecules). Additionally, surface molecules are primary targets for vaccine development, as they are often highly immunogenic and accessible to the host's immune system (Rappuoli et al., 2016, Nat Rev Immunol). However, the high degree of structural variability and the evolution of resistance mechanisms, such as target modification or capsule switching, present significant challenges for drug and vaccine efficacy. The rapid lysis of bacteria and subsequent release of these surface components can also trigger systemic inflammatory responses, such as the Jarisch-Herxheimer reaction (Dhaliwal et al., 2023, StatPearls). Understanding the molecular landscape of the bacterial surface is crucial for the design of next-generation precision antibiotics and conjugate vaccines.

Other names

Bacterial surface antigensCell envelope componentsSurface-exposed moleculesBacterial PAMPs

Inhibition of cell wall biosynthesis, disruption of membrane integrity, or antibody-mediated neutralization of surface antigens.