Abstract
N-Acyl-l-homoserine lactones (AHLs) are synthesized by Gram-negative bacteria. These quorum-sensing molecules play an important role in the context of bacterial infection and biofilm formation. They also allow communication between microorganisms and eukaryotic cells (inter-kingdom signalling). However, very little is known about the entire mechanism of those interactions. Precise structural studies are required to analyse the different AHL isomers as only one form is biologically most active. Theoretical studies combined with experimental infrared and Raman spectroscopic data are therefore undertaken to characterise the obtained compounds. To mimic interactions between AHL and cell membranes, we studied the insertion of AHL in supported lipid bilayers, using vibrational sum-frequency-generation spectroscopy. Deuterium-labelled AHLs were thus synthesized. Starting from readily available deuterated fatty acids, a two-step procedure towards deuterated N-acyl-l-homoserine lactones with varying chain lengths is described. This included the acylation of Meldrum’s acid followed by amidation. Additionally, the detailed analytical evaluation of the products is presented herein.
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Abbreviations
- 3OC8-d 9-HSL:
-
N-(3-Oxooctanoyl-d 9)-l-homoserine lactone
- 3OC12-d 17-HSL:
-
N-(3-Oxododecanoyl-d 17)-l-homoserine lactone
- 3OC14-d 21-HSL:
-
N-(3-Oxotetradecanoyl-d 21)-l-homoserine lactone
- AHLs:
-
N-Acyl-l-homoserine lactones
- DFT:
-
Density functional theory
- ESI-TOF MS:
-
Electrospray ionization time-of-flight mass spectrometry
- ESI-MS/MS:
-
Electrospray ionization tandem mass spectrometry
- HRMS:
-
High-resolution mass spectrometry
- IR:
-
Infrared spectroscopy
- QCM-D:
-
Quartz crystal microbalance with dissipation
- SFG:
-
Sum-frequency-generation
- SLBs:
-
Supported lipid bilayers
- TLC:
-
Thin-layer chromatography
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Acknowledgements
Financial support from the Helmholtz program Bio-interfaces is gratefully acknowledged. A.K. and K.F. were supported by the DFG-funded transregional collaborative research centre SFB/TRR 88 “3MET”. We thank Stefan Heissler from Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces (IFG) for help with IR and Raman spectra acquisition. P.K. and C.B. thank Sofia Svedhem from Chalmers University of Technology for help with QCM-D and SLB preparation as well as Michael Grunze for his support.
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Jakubczyk, D., Barth, C., Kubas, A. et al. Deuterium-labelled N-acyl-l-homoserine lactones (AHLs)—inter-kingdom signalling molecules—synthesis, structural studies, and interactions with model lipid membranes. Anal Bioanal Chem 403, 473–482 (2012). https://doi.org/10.1007/s00216-012-5839-4
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DOI: https://doi.org/10.1007/s00216-012-5839-4