NDLI: Partitioning of Pyrene-Labeled Phospho- and Sphingolipids between Ordered and Disordered Bilayer Domains

Content Provider	PubMed Central
Author	Koivusalo, Mirkka Alvesalo, Joni Virtanen, Jorma A. Somerharju, Pentti
Copyright Year	2004
Abstract	Here we have studied how the length of the pyrene-labeled acyl chain (n) of a phosphatidylcholine, sphingomyelin, or galactosylceramide affects the partitioning of these lipids between 1), gel and fluid domains coexisting in bovine brain sphingomyelin (BB-SM) or BB-SM/spin-labeled phosphatidylcholine (PC) bilayers or 2), between liquid-disordered and liquid-ordered domains in BB-SM/spin-labeled PC/cholesterol bilayers. The partitioning behavior was deduced either from modeling of pyrene excimer/monomer ratio versus temperature plots, or from quenching of the pyrene monomer fluorescence by spin-labeled PC. New methods were developed to model excimer formation and pyrene lipid quenching in segregated bilayers. The main result is that partition to either gel or liquid-ordered domains increased significantly with increasing length of the labeled acyl chain, probably because the pyrene moiety attached to a long chain perturbs these ordered domains less. Differences in partitioning were also observed between phosphatidylcholine, sphingomyelin, and galactosylceramide, thus indicating that the lipid backbone and headgroup-specific properties are not severely masked by the pyrene moiety. We conclude that pyrene-labeled lipids could be valuable tools when monitoring domain formation in model and biological membranes as well as when assessing the role of membrane domains in lipid trafficking and sorting.
Starting Page	923
File Format	PDF
ISSN	15420086
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	2
Volume Number	86
Language	English
Publisher	Biophysical Society
Publisher Date	2004-02-01
Access Restriction	Open
Rights Holder	Biophysical Society
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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