Other autoinducer-2 receptor

Other autoinducer-2 receptor refers to a diverse group of bacterial proteins that recognize the universal quorum-sensing signal autoinducer-2 (AI-2), distinct from the well-characterized LuxP and LsrB families (Source: NIH, Frontiers in Microbiology). These receptors include the ribose-binding protein RbsB, the histidine kinase AsrK, and various chemoreceptors such as PctA and TlpQ, which allow a wide range of bacteria to sense and respond to interspecies communication (Source: NIH, ACS Chemical Biology). AI-2 is a byproduct of the activated methyl cycle, and its perception by these receptors regulates critical processes such as biofilm formation, motility, and the expression of virulence factors (Source: NIH, Journal of Bacteriology). Because AI-2 signaling is central to bacterial coordination and pathogenesis, these receptors are attractive targets for pathoblocker or anti-virulence therapies (Source: NIH, MDPI). Small molecule inhibitors, often structural analogs of the AI-2 precursor DPD, can competitively bind to these receptors to disrupt quorum sensing without killing the bacteria, potentially reducing the selective pressure for antibiotic resistance (Source: ACS Chemical Biology). However, the high conservation of binding domains among different sugar-binding proteins and the potential for disrupting beneficial commensal bacteria present significant therapeutic challenges (Source: NIH, Nature Communications).

Other names

Non-canonical autoinducer-2 receptorAlternative AI-2 binding proteinNon-LuxP/Non-LsrB AI-2 receptorRbsB (Ribose-binding protein)AsrK (Histidine kinase)PctA (Chemoreceptor)TlpQ (Chemoreceptor)KinD (Histidine kinase)MapR (Methyl-accepting chemotaxis protein)LsrR (Intracellular AI-2 regulator)

Quorum sensing inhibition via competitive antagonism of AI-2 binding sites or modulation of downstream signal transduction pathways, thereby preventing the activation of virulence and biofilm-related genes.