Lipid-Bilayer Dynamics Probed by a Carbon Dot-Phospholipid Conjugate

Sukhendu Nandi, Ravit Malishev, Susanta Kumar Bhunia, Sofiya Kolusheva, Jürgen Jopp, Raz Jelinek

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Elucidating the dynamic properties of membranes is important for understanding fundamental cellular processes and for shedding light on the interactions of proteins, drugs, and viruses with the cell surface. Dynamic studies of lipid bilayers have been constrained, however, by the relatively small number of pertinent molecular probes and the limited physicochemical properties of the probes. We show that a lipid conjugate comprised of a fluorescent carbon dot (C-dot) covalently attached to a phospholipid constitutes a versatile and effective vehicle for studying bilayer dynamics. The C-dot-modified phospholipids readily incorporated within biomimetic membranes, including solid-supported bilayers and small and giant vesicles, and inserted into actual cellular membranes. We employed the C-dot-phospholipid probe to elucidate the effects of polymyxin-B (a cytolytic peptide), valproic acid (a lipophilic drug), and amyloid-β (a peptide associated with Alzheimer's disease) upon bilayer fluidity and lipid dynamics through the application of various biophysical techniques.

Original languageEnglish
Pages (from-to)2016-2025
Number of pages10
JournalBiophysical Journal
Volume110
Issue number9
DOIs
StatePublished - 10 May 2016

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