Abstract
The techniques achieving the highest resolution only can characterize membrane heterogeneities on the lowest molecular level. When Förster resonance energy transfer (FRET) is combined with Monte-Carlo (MC) simulations and is applied to the measurement of nanodomain/pore sizes it reaches an unbeatable resolution of 2–50 nm. While other techniques start being less efficient at such short distances FRET is most efficient in this region. Here, usefulness of MC-FRET is demonstrated on three different systems that contain heterogeneously distributed lipids: a nanoscopically phase separated bilayer, a bilayer containing pores and finally on bicelles consisting of highly curved and flat regions. Moreover, this paper gives the reader information on how a FRET experiment should be designed to achieve the highest FRET resolution but also which experimental conditions should be avoided. The theory describing FRET between randomly distributed donors and acceptors in a lipid bilayer is also described in this paper as well as reasons are explained why for heterogeneous probe distribution MC simulations should rather be used.
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Abbreviations
- A r :
-
Area fraction of the Lo domains
- B-F:
-
Baumann-Fayer
- BODIPY-FL:
-
4,4-difluoro-4-bora-3a,4a-diaza-5,7-dimethyl-s-indacenyl
- BODIPY 564/570:
-
4,4-difluoro-4-bora-3a,4a-diaza-5-styryl-dimethyl-s-indacenyl
- C 2 :
-
Reduced surface concentration
- C 2A :
-
Reduced surface concentration in phase A
- C 2B :
-
Reduced surface concentration in phase B
- CTxB:
-
Cholera toxin
- DAET:
-
Donor-acceptor energy transfer
- DDEM:
-
donor-donor energy migration
- DiD:
-
1,1′-Dioctadecyl-3,3,3′,3′-Tetramethylindodicarbocyanine-5,5′-Disulfonic Acid (DiIC18(5)-DS)
- FRET:
-
Förster resonance energy transfer
- G s(t):
-
the excitation probability of the initially excited donor
- κ :
-
Angular dependence of dipole-dipole coupling
- τ D :
-
Fluorescence lifetime of the donor
- MC:
-
Monte Carlo
- R :
-
Radius of a lipid domain/raft
- R 0 :
-
Förster radius
- r 0 :
-
Limiting anisotropy
- TCSPC:
-
Time-correlated single-photon counting
- Ld :
-
Liquid disordered phase
- Lo :
-
Liquid ordered phase
- K i (i = D or A):
-
Partition coefficient of donors (i = D) or acceptors (i = A)
- R :
-
Domain radius
- R plane :
-
Radius of the bicellar planes (cf. Picture 7.3)
- R pore :
-
Radius of the pores
- SS:
-
Steady-state
- Sph:
-
Sphingomyelin
- TR:
-
Time-resolved
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Acknowledgements
This work was financially supported by the Grant Agency of the Czech Republic via the grant 14-03141 (RŠ) and the Swedish Research Council (LBÅJ).
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Šachl, R., Johansson, L.BÅ. (2016). Heterogeneous Lipid Distributions in Membranes as Revealed by Electronic Energy Transfer. In: Geddes, C. (eds) Reviews in Fluorescence 2015. Reviews in Fluorescence, vol 8. Springer, Cham. https://doi.org/10.1007/978-3-319-24609-3_7
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