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Biophys J, June 2001, p. 2775-2788, Vol. 80, No. 6
Field of Biophysics, Biotechnology Building, Cornell University, Ithaca, New York 14853 USA
A ternary phase diagram is proposed for the hydrated
lamellar lipid mixture
dipalmitoylphosphatidylcholine/dilauroylphosphatidylcholine/cholesterol (DPPC/DLPC/cholesterol) at room temperature. The entire composition space has been thoroughly mapped by complementary experimental techniques, revealing interesting phase behavior that has not been
previously described. Confocal fluorescence microscopy shows a regime
of coexisting DPPC-rich ordered and DLPC-rich fluid lamellar phases,
having an upper boundary at apparently constant cholesterol mole
fraction
chol ~ 0.16. Fluorescence resonance
energy transfer experiments confirm the identification and extent of
this two-phase regime and, furthermore, reveal a 1-phase regime between
chol ~ 0.16 and 0.25, consisting of ordered and
fluid nanoscopic domains. Dipyrene-PC excimer/monomer measurements
confirm the new regime between
chol ~ 0.16 and
0.25 and also show that rigidly ordered phases seem to disappear around
chol ~ 0.25. This study should be considered as a
step toward a more complete understanding of lateral heterogeneity
within biomembranes. Cholesterol may play a role in domain separation
on the nanometer scale.
Biophys J, June 2001, p. 2775-2788, Vol. 80, No. 6
© 2001 by the Biophysical Society 0006-3495/01/06/2775/14 $2.00
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