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Surface Layer Protein A

Molecular classification: Surface Layer Protein, Adhesion factor, Phage Receptor

Overview

Surface Layer Protein A (SlpA) is the primary structural component of the S-layer, a paracrystalline protein array forming the outermost surface of certain bacteria like *Clostridioides difficile*. It is crucial for bacterial structure, adherence, and virulence. SlpA undergoes post-translational cleavage into HMW and LMW subunits. It also acts as a receptor for bacteriophages. Sequence variability among strains impacts immune evasion and susceptibility to phage therapy.

Mechanism of action

Blocking adherence, disruption of S-layer assembly, phage-mediated lysis

Biological functions

Structural supportAdherence to host cellsImmune modulationBiofilm formationPhage receptor

Disease associations

Clostridioides difficile infectionGastrointestinal infectionInflammation

Safety considerations

Potential for immune evasion due to sequence variabilityOff-target effects of S-layer targeting therapies

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