Bacteria have a quorum sensing mechanism that helps them communicate to other bacteria. It helps optimize activities such as altering behavior in response to other bacteria, facilitating cell-to-cell communication, and defeating competitors. By studying different quorum sensing signaling molecules in Pseudomonas aeruginosa and Burkholderia thailandensis, we have concluded that bacteria exert synergistic and antagonistic relationship in response to their environment. Bioluminescence studies have proven that different quinolones possess different characteristics. The difference in quorum sensing response between the Pseudomonas and Burkholderia species is largely dictated by the methylation of the quinolone ring named 4-hydroxy-3-methyl-2-alkylquinolines (HMAQs) rather than unsaturation of the alkyl chain of Burkholderia species. Also, our results indicate that there is little cross-talk between the quinolone quorum sensing molecules of both P. aeruginosa and methylated Burkholderia species. Furthermore, limited response to N-oxide quinolones indicates an attenuation of the quinolone quorum sensing response.
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Chemistry
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