Isolation and characterization of lipid rafts in Emiliania huxleyi: A role for membrane microdomains in host-virus interactions

Suzanne L. Rose, James M. Fulton, Christopher M. Brown, Frank Natale, Benjamin A.S. Van Mooy, Kay D. Bidle

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Summary: Coccolithoviruses employ a suite of glycosphingolipids (GSLs) to successfully infect the globally important coccolithophore Emiliania huxleyi. Lipid rafts, chemically distinct membrane lipid microdomains that are enriched in GSLs and are involved in sensing extracellular stimuli and activating signalling cascades through protein-protein interactions, likely play a fundamental role in host-virus interactions. Using combined lipidomics, proteomics and bioinformatics, we isolated and characterized the lipid and protein content of lipid rafts from control E.huxleyi cells and those infected with EhV86, the type strain for Coccolithovirus. Lipid raft-enriched fractions were isolated and purified as buoyant, detergent-resistant membranes (DRMs) in OptiPrep density gradients. Transmission electron microscopy of vesicle morphology, polymerase chain reaction amplification of the EhV major capsid protein gene and immunoreactivity to flotillin antisera served as respective physical, molecular and biochemical markers. Subsequent lipid characterization of DRMs via high performance liquid chromatography-triple quadrapole mass spectrometry revealed four distinct GSL classes. Parallel proteomic analysis confirmed flotillin as a major lipid raft protein, along with a variety of proteins affiliated with host defence, programmed cell death and innate immunity pathways. The detection of an EhV86-encoded C-type lectin-containing protein confirmed that infection occurs at the interface between lipid rafts and cellular stress/death pathways via specific GSLs and raft-associated proteins.

Original languageEnglish (US)
Pages (from-to)1150-1166
Number of pages17
JournalEnvironmental microbiology
Volume16
Issue number4
DOIs
StatePublished - Apr 2014

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Haptophyta
Membrane Microdomains
Emiliania huxleyi
virus
glycosphingolipids
lipid
Glycosphingolipids
membrane
Viruses
Lipids
viruses
protein
lipids
Proteins
proteomics
detergents
Detergents
Proteomics
detergent
proteins

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Rose, Suzanne L. ; Fulton, James M. ; Brown, Christopher M. ; Natale, Frank ; Van Mooy, Benjamin A.S. ; Bidle, Kay D. / Isolation and characterization of lipid rafts in Emiliania huxleyi : A role for membrane microdomains in host-virus interactions. In: Environmental microbiology. 2014 ; Vol. 16, No. 4. pp. 1150-1166.
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Isolation and characterization of lipid rafts in Emiliania huxleyi : A role for membrane microdomains in host-virus interactions. / Rose, Suzanne L.; Fulton, James M.; Brown, Christopher M.; Natale, Frank; Van Mooy, Benjamin A.S.; Bidle, Kay D.

In: Environmental microbiology, Vol. 16, No. 4, 04.2014, p. 1150-1166.

Research output: Contribution to journalArticle

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