Archaeal surface layer protein (SLP)

The Archaeal surface layer (S-layer) is a paracrystalline monomolecular assembly of protein or glycoprotein subunits that constitutes the outermost component of the cell envelope in nearly all Archaea (Sleytr et al., 2014). It serves as a primary structural element, providing mechanical stability, maintaining cell shape, and acting as a selective molecular sieve for nutrient and waste exchange (Albers & Meyer, 2011). Unlike bacterial cell walls that often contain peptidoglycan, many Archaea rely solely on the S-layer for protection against extreme environmental conditions such as high temperature, extreme pH, or high salinity (Rodrigues-Oliveira et al., 2017). The S-layer also facilitates cell-cell interactions and provides a scaffold for the attachment of other surface structures like flagella or pili (Albers & Meyer, 2011). While Archaea are prominent members of the human microbiome, particularly in the gut and oral cavity, they are not currently recognized as primary human pathogens (Gill & Enfield, 2017). Because of this lack of pathogenicity, Archaeal S-layer proteins are not currently utilized as targets for conventional antimicrobial or therapeutic drugs. However, their unique ability to self-assemble into highly ordered lattices makes them valuable in nanobiotechnology for developing drug delivery systems and biosensors (Sleytr et al., 2014). They are also being explored as adjuvant platforms in vaccine development due to their inherent immunogenicity and stability (Sleytr et al., 2014).

Other names

S-layer proteinArchaebacterial cell wall S-layerSurface layer proteinCrystalline cell surface layerArchaeal S-layer

Not applicable