Abstract
Bacteria communicate with each other by a process termed “quorum sensing” (QS), and diffusible, low-molecular-weight chemicals, called signal molecules, are used as the communication languages. In cell-free Burkholderia cepacia CF-66 culture supernatants, five compounds suspected of being signal molecules were identified. The gene (cepI) related with AHLs synthesis were not detected by polymerase chain reaction (PCR) using specific primers. Gas chromatography–mass spectrometry (GC–MS) revealed that these compounds were not AHLs but the diketopiperazines (DKPs) cyclo(Pro–Phe), cyclo(Pro–Tyr), cyclo(Ala–Val), cyclo(Pro–Leu), and cyclo(Pro–Val), all of which were both d and l-type. Four kinds of DKPs had been isolated from other Gram-negative bacteria, but the other was a novel kind discovered in CF-66, and l-cyclo (Pro–Phe) was quantified by GC–MS. It was found that exogenous DKPs had a negative effect on the candidacidal activity of the culture supernatant extracts.
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Abbreviations
- QS:
-
Quorum sensing
- CF-66:
-
Burkholderia cepacia CF-66
- GC–MS:
-
Gas chromatography-mass spectrometry
- DKPs:
-
Diketopiperazines
- AHL:
-
Acyl-homoserine lactone
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Acknowledgements
I would particularly like to acknowledge the support my advisor Chunshan Quan, Dr Xin Li, and MS Xiaohui Qi gave me. This work was supported by a grant from the Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry (N.O. 20052101).
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Wang, JH., Quan, CS., Qi, XH. et al. Determination of diketopiperazines of Burkholderia cepacia CF-66 by gas chromatography–mass spectrometry. Anal Bioanal Chem 396, 1773–1779 (2010). https://doi.org/10.1007/s00216-009-3379-3
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DOI: https://doi.org/10.1007/s00216-009-3379-3