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The antibiofilm activity and molecular mechanism of a natural phenolic compound, 3- p-trans -coumaroyl-2-hydroxyquinic acid (CHQA) against Staphylococcus aureus were investigated in this study. Crystal violet staining and XTT reduction assay demonstrated that CHQA could prominently prevent the biofilm formation of S. aureus accompanied with decrease in metabolic activity of biofilm cells. Meanwhile, microscopic observations revealed that CHQA caused a huge collapse on the architecture of S. aureus biofilm. Moreover, CHQA specifically inhibited the initial attachment phase of biofilm development and reduced S. aureus adhesion to fibrinogen. Fluorescence resonance energy transfer assay and molecular simulation showed that CHQA inhibited the activity of S. aureus sortase A (SrtA) through binding to the active region via non-covalent interactions. Additionally, CHQA efficiently reduced S. aureus attachment to stainless steel. Hence, these results suggested CHQA as a potential bacterial biofilm inhibitor which achieved antibiofilm activity through affecting the attachment phase of biofilm formation by targeting SrtA.

rsc advances

Inhibitory effect of a natural phenolic compound, 3-<i>p-trans</i>-coumaroyl-2-hydroxyquinic acid against the attachment phase of biofilm formation of <i>Staphylococcus aureus</i> through targeting sortase A

Inhibitory effect of a natural phenolic compound, 3-p-trans-coumaroyl-2-hydroxyquinic acid against the attachment phase of biofilm formation of Staphylococcus aureus through targeting sortase A