Bacterial surface structures and lactoferrin-binding receptors (LbpA/LbpB)

Bacterial surface structures and lactoferrin-binding receptors represent a group of molecular targets on the surface of pathogenic bacteria that interact with the host protein lactoferrin. These targets include specific receptors such as lactoferrin-binding protein A (LbpA) and B (LbpB), which are utilized by bacteria like Neisseria meningitidis and Moraxella catarrhalis to acquire essential iron from host lactoferrin (22.2.2, 24.2.1). Additionally, lactoferrin binds directly to general bacterial surface structures, most notably lipopolysaccharide (LPS) in Gram-negative bacteria and lipoteichoic acid (LTA) in Gram-positive bacteria (22.1.2, 24.1.2). This binding can lead to the destabilization of the bacterial outer membrane, resulting in increased permeability and cell death (24.3.1, 24.3.3). Therapeutic strategies targeting these structures include the administration of recombinant human lactoferrin (e.g., talactoferrin alfa) to exploit its natural antimicrobial and immunomodulatory properties (22.2.1, 24.1.2). Furthermore, specific bacterial proteins like Pneumococcal surface protein A (PspA) bind lactoferrin to protect the pathogen from host defenses, making them attractive targets for vaccine development (24.4.3, 28.1.2). Experimental vaccines targeting LbpA and LbpB are also under investigation to induce protective immunity against meningitis and respiratory infections (24.2.3, 28.2.1). The dual mechanism of iron sequestration and direct membrane disruption makes these surface structures critical focal points for anti-infective therapy.

Other names

Lactoferrin-binding protein ALactoferrin-binding protein BLbpALbpBBacterial lactoferrin receptorLipopolysaccharideLPSLipoteichoic acidLTAPneumococcal surface protein APspA

Iron sequestration (bacteriostatic), membrane destabilization via binding to LPS/LTA (bactericidal), and proteolytic degradation of bacterial virulence factors.