Abstract
Fluorescence Recovery After Photobleaching experiments were simulated using a computer approach in which a membrane lipid leaflet was mimicked using a triangular lattice obstructed with randomly distributed immobile and non-overlapping circular obstacles. Influence of the radius r and area fraction c of these obstacles and of the radius R of the observation area on the relative diffusion coefficient D * (Eq. (1)) and mobile fraction M was analyzed. A phenomenological equation relating D * to r and c was established. Fitting this equation to the FRAP data we obtained with the probe NBD-PC embedded in bacteriorhodopsin/egg-PC multilayers suggests that this transmembrane protein rigidifies the surrounding lipid phase over a distance of about 18 Å (≅two lipid layers) from the protein surface. In contrast, analysis of published diffusion constants obtained for lipids in the presence of gramicidin suggests that in terms of lateral diffusion, this relatively small polypeptide does not significantly affect the surrounding lipid phase. With respect to the mobile fraction M, and for point obstacles above the percolation threshold, an increase in R led to a decrease in M which can be associated with the existence of closed domains whose average size and diffusion properties can be determined. Adaptation of this model to the re-interpretation of the FRAP data obtained by Yechiel and Edidin (J Cell Biol (1987) 115:755–760) for the plasma membrane of human fibroblasts consistently leads to the suggestion that the lateral organization of this membrane would be of the confined type, with closed lipid domains of ≅0.5 µm2 in area.
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Abbreviations
- BR:
-
bacteriorhodopsin
- DMPC:
-
dimyristoylphosphatidylcholine
- diOC18:
-
dioctadecyloxatricarbocyanine
- egf-PC:
-
egg-yolk phosphatidylcholine
- NBD-PC:
-
1-acyl2-[t2-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]dodecanoyl]-sn-glycero-3-phosphocholine
- MOPS:
-
3-[N-morpholino]propane sulfonic acid
- FRAP:
-
Fluoresence Recovery After photobleaching
- D:
-
observed diffusion coefficient
- D0:
-
diffusion coefficient in the absence of obstacles
- D * :
-
relative diffusion constant (Eq. 1)
- M :
-
mobile fraction
- c :
-
obstacle area fraction
- r :
-
obstacle radius
- R :
-
observation area radius
- r d :
-
diffusion area radius
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Schram, V., Tocanne, JF. & Lopez, A. Influence of obstacles on lipid lateral diffusion: computer simulation of FRAP experiments and application to proteoliposomes and biomembranes. Eur Biophys J 23, 337–348 (1994). https://doi.org/10.1007/BF00188657
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DOI: https://doi.org/10.1007/BF00188657