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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Inhibition of growth and cysteine proteinase activity of Staphylococcus aureus V8 by phosphorylated cystatin alpha in skin cornified envelope.

The activity of a cysteine proteinase purified from Staphylococcus aureus V8 (SAV8) was inhibited by phosphorylated cystatin alpha (P-cystatin alpha) and by purified cornified envelope protein of newborn rat, a conjugated form of P-cystatin alpha. Immunohistochemical analysis demonstrated a marked decrease in P-cystatin alpha content in cornified envelope treated with sphingosine. The inhibition of papain activity by proteins from sphingosine-treated skin was much weaker than that exerted by proteins from the untreated skin. The suppression of SAV8 colony formation inoculated on the sphingosine-treated skin was examined. Colony formation on the sphingosine-treated skin was enhanced compared to that on normal skin. These findings suggest that P-cystatin alpha in the cornified envelope may have a bacteriostatic barrier function against bacterial infection, such as that with SAV8.[1]


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