Staphylococcus aureus surface protein

The “Staphylococcus aureus surface antigen” is not a single, defined molecular target, but refers generically to the large and diverse family of **surface-expressed proteins** found on Staphylococcus aureus. These proteins, often called **cell wall-anchored (CWA) surface proteins**, are covalently attached to the bacterial cell wall via the action of the enzyme sortase A[1][6]. Prominent among these are the **MSCRAMM family** (Microbial Surface Components Recognizing Adhesive Matrix Molecules), which includes proteins such as protein A (SpA), clumping factor A (ClfA), and the iron-regulated surface determinant proteins (IsdA/IsdB)[1][6]. Each protein mediates specific functions: adhesion to host tissues, evasion of the host immune system, biofilm formation, iron acquisition, and direct invasion of host cells[1][5][6]. These surface proteins are crucial for S. aureus virulence and pathogenesis in a variety of infections. They are recognized as important therapeutic and vaccine targets, with some being evaluated as antigens in multicomponent vaccines[1][5]. However, since “Staphylococcus aureus surface antigen” does not uniquely specify any single protein, the term is overly broad and non-specific, and thus is not optimal for drug or vaccine development targeting, where specific proteins (e.g., SpA, ClfA) are more appropriate. Caveats and notes: - **is_incorrect** is true because “Staphylococcus aureus surface antigen” is a generic, non-specific term, not a unique molecular entity. Proper targets should specify a particular surface protein, such as “Staphylococcus aureus protein A” or “Staphylococcus aureus clumping factor A”[1][6]. - The canonical name should be updated to point to a specific well-characterized surface protein for precise research, therapeutic targeting, or data structuring. - For antibody, drug, or vaccine targeting, it is critical to specify which S. aureus surface protein is being considered[1][5][6].

Other names

Cell wall-anchored surface proteinCWA proteinStaphylococcal surface-associated antigenMSCRAMM (for family)specific examples include "Protein A" (SpA)"Clumping factor A" (ClfA)"Fibronectin binding protein" (FnBP)"Iron-regulated surface determinant" (IsdA/IsdB)"Serine-rich adhesin for platelets" (SraP/SasA)etc.

Blockade of adhesion to host tissues Neutralization of immune evasion mechanisms Inhibition of biofilm formation Disruption of iron uptake