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Cell-cell communication is also known as quorum sensing (QS) that happens in the bacterial cells with the aim to regulate their genes expression in response to increased cell density. In this study, a bacterium (L8A) isolated from dental plaque biofilm was identified as  Citrobacter amalonaticus  by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS). Its  N -acylhomoserine-lactone (AHL) production was screened by using two types of AHL biosensors namely  Chromobacterium violaceum  CV026 and  Escherichia coli  [pSB401].  Citrobacter amalonaticus  strain L8A was identified and confirmed producing numerous types of AHL namely  N -butyryl-L-homoserine lactone (C4-HSL),  N -hexanoyl-L-homoserine lactone (C6-HSL),  N -octanoyl-L-homoserine lactone (C8-HSL) and  N -hexadecanoyl-L-homoserine lactone (C16-HSL). We performed the whole genome sequence analysis of this oral isolate where its genome sequence reveals the presence of QS signal synthase gene and our work will pave the ways to study the function of the related QS genes in this bacterium.

Quorum sensing activity of Citrobacter amalonaticus L8A, a bacterium isolated from dental plaque