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Abbes I, Rihouey C, Hardouin J, Jouenne T, De E, Alexandre S. Identification by mass spectrometry of glucosaminylphosphatidylglycerol, a phosphatidylglycerol derivative, produced by Pseudomonas aeruginosa. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:2113-2121. [PMID: 30171632 DOI: 10.1002/rcm.8277] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 08/21/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Pseudomonas aeruginosa is an opportunistic pathogen bacterium widely considered to be an excellent research model in several areas of molecular studies, namely genomics and proteomics. However, its lipid metabolism is still not totally decrypted. While it is known that this bacterium has the particularity to produce phosphatidylcholine, a lipid mainly found in eukaryotes, other singularities are still to be discovered. METHODS P. aeruginosa was grown as planktonic cultures to the stationary state. Membrane pellets were collected and lipids were extracted using the Bligh and Dyer protocol. Lipid extracts were analyzed by Electrospray Ionization Mass Spectrometry (ESI-MS) using high-resolution mass spectrometer (LTQ Orbitrap Elite, Thermo Scientific) in the negative mode. MSn spectra were recorded both in the Orbitrap and in the ion trap analyzer (collision-induced dissociation (CID) or higher energy collision-induced dissociation (HCD) mode). RESULTS We observed by mass spectrometry and thin layer chromatography that P. aeruginosa produced an unreferenced lipid in classical growth conditions. MS2 analysis of the unknown ion indicates that it is a phosphatidylglycerol derivative. The exact mass shift corresponds to glucosamine which is largely found in the metabolism of this bacterium. MS3 analysis of secondary ions allowed us to conclude that this lipid is a glucosaminylphosphatidylglycerol, a phosphatidylglycerol derivative containing a glucosamine substituted at C4. CONCLUSIONS We show here that P. aeruginosa is able to produce glucosaminylphosphatidylglycerols via a probable esterification of phosphatidylglycerols by glucosamine.
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Affiliation(s)
- Imen Abbes
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
| | - Christophe Rihouey
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
| | - Julie Hardouin
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
- PISSARO proteomics facility, Université de Rouen, F-76821, Mont-Saint-Aignan, France
| | - Thierry Jouenne
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
- PISSARO proteomics facility, Université de Rouen, F-76821, Mont-Saint-Aignan, France
| | - Emmanuelle De
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
| | - Stéphane Alexandre
- CNRS, UMR 6270, "Polymères, Biopolymères, Surfaces", Université de Rouen, F-76821, Mont-Saint-Aignan, France
- Normandie Université, F-14032, Caen, France
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