Membrane orientation and lateral diffusion of BODIPY-cholesterol as a function of probe structure

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Lukasz M. Solanko - , University of Southern Denmark (Autor:in)
  • Alf Honigmann - , Max Planck Institute for Biophysical Chemistry (Karl Friedrich Bonhoeffer Institute) (Autor:in)
  • Henrik Skov Midtiby - , University of Southern Denmark (Autor:in)
  • Frederik W. Lund - , University of Southern Denmark (Autor:in)
  • Jonathan R. Brewer - , University of Southern Denmark (Autor:in)
  • Vjekoslav Dekaris - , City University of New York (Autor:in)
  • Robert Bittman - , City University of New York (Autor:in)
  • Christian Eggeling - , Max Planck Institute for Biophysical Chemistry (Karl Friedrich Bonhoeffer Institute), University of Oxford (Autor:in)
  • Daniel Wüstner - , University of Southern Denmark (Autor:in)

Abstract

Cholesterol tagged with the BODIPY fluorophore via the central difluoroboron moiety of the dye (B-Chol) is a promising probe for studying intracellular cholesterol dynamics. We synthesized a new BODIPY-cholesterol probe (B-P-Chol) with the fluorophore attached via one of its pyrrole rings to carbon-24 of cholesterol (B-P-Chol). Using two-photon fluorescence polarimetry in giant unilamellar vesicles and in the plasma membrane (PM) of living intact and actin-disrupted cells, we show that the BODIPY-groups in B-Chol and B-P-Chol are oriented perpendicular and almost parallel to the bilayer normal, respectively. B-Chol is in all three membrane systems much stronger oriented than B-P-Chol. Interestingly, we found that the lateral diffusion in the PM was two times slower for B-Chol than for B-P-Chol, although we found no difference in lateral diffusion in model membranes. Stimulated emission depletion microscopy, performed for the first time, to our knowledge, with fluorescent sterols, revealed that the difference in lateral diffusion of the BODIPY-cholesterol probes was not caused by anomalous subdiffusion, because diffusion of both analogs in the PM was free but not hindered. Our combined measurements show that the position and orientation of the BODIPY moiety in cholesterol analogs have a severe influence on lateral diffusion specifically in the PM of living cells.

Details

OriginalspracheEnglisch
Seiten (von - bis)2082-2092
Seitenumfang11
FachzeitschriftBiophysical journal
Jahrgang105
Ausgabenummer9
PublikationsstatusVeröffentlicht - 5 Nov. 2013
Peer-Review-StatusJa
Extern publiziertJa

Externe IDs

PubMed 24209853
ORCID /0000-0003-0475-3790/work/161889559

Schlagworte

ASJC Scopus Sachgebiete