Bacterial surface lactoferrin-binding proteins and bacterial membranes (Lbp/OM)

Bacterial surface lactoferrin-binding proteins (LbpA and LbpB) and the bacterial outer membrane constitute a critical interface for host-pathogen interactions, particularly in Gram-negative bacteria such as Neisseria meningitidis and Moraxella catarrhalis [1, 5]. LbpA is a TonB-dependent transporter that works in conjunction with the surface-exposed lipoprotein LbpB to extract essential iron from human lactoferrin, facilitating bacterial survival in iron-limited host environments [7, 9]. Simultaneously, the bacterial membrane, specifically the lipopolysaccharide (LPS) layer, serves as a direct target for the antimicrobial action of lactoferrin and its derivatives [2, 4]. Lactoferrin binds to LPS, causing the release of membrane components and increasing permeability, which can lead to bacterial cell death [4, 8]. Therapeutic strategies targeting this system include the use of recombinant human lactoferrin (e.g., talactoferrin) to sequester iron and disrupt membrane integrity, as well as the development of vaccines targeting the surface-exposed LbpB protein [5, 11]. By interfering with iron acquisition and compromising the structural stability of the bacterial envelope, these interventions aim to inhibit bacterial growth and enhance clearance by the host immune system [3, 7]. However, challenges such as the potential for endotoxin release and the emergence of alternative iron-uptake mechanisms must be considered in drug development [5, 10].

Other names

Lactoferrin receptor complexLbpAB complexBacterial outer membraneLPS-binding sitesLbpA/LbpB receptor

Sequestration of iron from the environment and disruption of bacterial membrane integrity through binding to lipopolysaccharides and surface receptors.