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The general structure of AHL signals and the corresponding degradation mechanisms of AHL-lactonase (A) and AHL-acylase (B). Cleavage of the lactone ring by an AHL-lactonase enzyme (dashed arrow) yields the corresponding acyl homoserine. Cleavage of the amide bond by an AHL-acylase enzyme (filled arrow) yields the corresponding fatty acid and homoserine lactone (HSL) ring.
