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  4. Structural diversity of photoswitchable sphingolipids for optodynamic control of lipid microdomains
 
research article

Structural diversity of photoswitchable sphingolipids for optodynamic control of lipid microdomains

Hartrampf, Nina
•
Leitao, Samuel M.  
•
Winter, Nils
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June 6, 2023
Biophysical Journal

Sphingolipids are a structurally diverse class of lipids predominantly found in the plasma membrane of eukaryotic cells. These lipids can laterally segregate with other rigid lipids and cholesterol into liquid-ordered domains that act as organizing centers within biomembranes. Owing the vital role of sphingolipids for lipid segregation, controlling their lateral organization is of utmost significance. Hence, we made use of the light-induced trans -cis isomerization of azobenzene-modified acyl chains to develop a set of photoswitchable sphingolipids with different headgroups (hydroxyl, galactosyl, phosphocholine) and backbones (sphingosine, phytosphingosine, tetrahydropyran-blocked sphingosine) that are able to shuttle between liquid-ordered and liquid-disordered regions of model membranes upon irradiation with UV-A (l = 365 nm) and blue (l = 470 nm) light, respectively. Using combined high-speed atomic force microscopy, fluorescence microscopy, and force spectroscopy, we investigated how these active sphingolipids laterally remodel supported bilayers upon photoisomerization, notably in terms of domain area changes, height mismatch, line tension, and membrane piercing. Hereby, we show that the sphingosine-based (Azo-b-Gal-Cer, Azo-SM, Azo-Cer) and phytosphingosine-based (Azo-a-Gal-PhCer, Azo-PhCer) photoswitchable lipids promote a reduction in liquid-ordered microdomain area when in the UV-adapted cis-isoform. In contrast, azo-sphingolipids having tetra-hydropyran groups that block H-bonding at the sphingosine backbone (lipids named Azo-THP-SM, Azo-THP-Cer) induce an in-crease in the liquid-ordered domain area when in cis, accompanied by a major rise in height mismatch and line tension. These changes were fully reversible upon blue light-triggered isomerization of the various lipids back to trans, pinpointing the role of interfacial interactions for the formation of stable liquid-ordered domains.

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Type
research article
DOI
10.1016/j.bpj.2023.02.029
Web of Science ID

WOS:001016844100001

Author(s)
Hartrampf, Nina
Leitao, Samuel M.  
Winter, Nils
Toombs-Ruane, Henry
Frank, James A.
Schwille, Petra
Trauner, Dirk
Franquelim, Henri G.
Date Issued

2023-06-06

Published in
Biophysical Journal
Volume

122

Issue

11

Start page

2325

End page

2341

Subjects

Biophysics

•

Biophysics

•

sphingomyelin headgroup size

•

line tension

•

combined afm

•

multicomponent membranes

•

phase-separation

•

hybrid lipids

•

domain size

•

ceramide

•

cholesterol

•

bilayers

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
July 17, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/199238
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