Quorum quenching acylase impacts the viability and morphological change of Agrobacterium tumefaciens cells

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Acylase is known as a quorum quenching enzyme that degrades N-acyl-homoserine lactones (AHLs), a key signaling molecule in a quorum sensing (QS) mechanism. Acylase I cleaves the acyl-chain in the chemical structures of AHLs, thereby exerting an anti-biofilm effect by the inhibition of bacterial cell-cell communication and resultant secretion of extracellular polymeric substances (EPS). However, the physical and physiological impacts of acylase on bacterial cells remain to be systematically elucidated. This study, therefore, investigated the effect of active and inactive acylase addition on the growth, viability, and cell morphologies of Agrobacterium tumefaciens. For comparison, active and inactive lysozymes were taken as positive controls. The results showed that active acylase inhibited A. tumefaciens cell growth at concentrations ranging from 0.1 to 1000 μg mL

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