Abstract
Polar lipids of bacteria from the class Thermomicrobia are known to contain long-chain 1,2-diols instead of glycerol, although the nature of polar head groups has not been investigated. We have studied phospholipid classes of two species from the class Thermomicrobia—Sphaerobacter thermophilus and Thermomicrobia sp. WKT50.2. TLC and 31P-NMR analysis of polar lipids revealed that both S. thermophilus and Thermomicrobia sp. WKT50.2 contain the same set of four major phospholipid classes. Structures of the novel phospholipids in S. thermophilus were established as 2-acylalkyldiol-1-O-phosphoinositol, 2-acylalkyldiol-1-O-phosphoinositol mannoside, 2-acylalkyldiol-1-O-phospho-acylmannoside, and 2-acylalkyldiol-1-O-phosphoinositol acylmannoside. To our knowledge, this is the first report of a phospholipid with a mannose directly bound to the phosphate. We also analyzed fatty acids and long-chain 1,2-diols of S. thermophilus and Thermomicrobia sp. WKT50.2 and compared our data with available information for T. roseum. All species share a similar set of fatty acids, with 12-Me 18:0 being the major fatty acid. The major diol in S. thermophilus was identified as 13-Me 19:0 (66.2 %). The 21:0 diol was the major component both in Thermomicrobia sp. WKT50.2 (50.6 %) and in T. roseum (56.6 %).
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Abbreviations
- diolPIns:
-
2-Acylalkyldiol-1-O-phosphoinositol
- diolPInsMan:
-
2-Acylalkyldiol-1-O-phosphoinositol mannoside
- diolP-acylMan:
-
2-Acylalkyldiol-1-O-phospho-acylmannoside
- diolPIns-acylMan:
-
2-Acylalkyldiol-1-O-phosphoinositol acylmannoside
- NMR:
-
Nuclear magnetic resonance
- TLC:
-
Thin-layer chromatography
- ESI:
-
Electrospray ionisation
- GCMS:
-
Gas chromatography–mass spectrometry
- MS:
-
Mass spectrometry
- HMBC:
-
Heteronuclear multiple bond coherence
- HSQC:
-
Heteronuclear single quantum coherence
- COSY:
-
Correlation spectroscopy
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Acknowledgments
This work was supported by Callaghan Innovation, Capability Fund project “Bioactives from New Zealand extremophiles” and the GNS Science Geothermal Resources of New Zealand (GRN) programme. We are grateful to Dr. Herbert Wong for NMR spectra recording and Dr. Yinrong Lu for MS recording (both from Callaghan Innovation).
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Lagutin, K., MacKenzie, A., Houghton, K.M. et al. Novel Long-Chain Diol Phospholipids from Some Bacteria Belonging to the Class Thermomicrobia . Lipids 50, 303–311 (2015). https://doi.org/10.1007/s11745-014-3979-3
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DOI: https://doi.org/10.1007/s11745-014-3979-3