A microscopic model for lipid/protein bilayers with critical mixing
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A microscopic model for lipid/protein bilayers with critical mixing. / Zhang, Zhengping; Sperotto, Maria M.; Zuckermann, Martin J.; Mouritsen, Ole G.
In: Biochimica et Biophysica Acta - Biomembranes, Vol. 1147, No. 1, 1993, p. 154-160.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - A microscopic model for lipid/protein bilayers with critical mixing
AU - Zhang, Zhengping
AU - Sperotto, Maria M.
AU - Zuckermann, Martin J.
AU - Mouritsen, Ole G.
PY - 1993
Y1 - 1993
N2 - A statistical mechanical lattice model is proposed to describe the phase diagram of phospholipid bilayers with small transmembrane proteins or polypeptides. The model is based on the extended Pink-Green-Chapman model (Zhang et al. (1992) Phys. Rev. A 45, 7560-7567) for pure lipid bilayers which undergo a first-order gel-fluid phase transition. The interaction between the lipid bilayer and the protein or polypeptide is modelled using the concept of hydrophobic matching. The phase diagram has been derived by computer-simulation techniques which fully account for thermal density fluctuations and which operate on the level of the free-energy thereby permitting an accurate identification of the phase boundaries. The calculations predict a closed loop of gel-fluid coexistence with a lower critical mixing point. Specific-heat traces across the phase diagram are also presented. The theoretical results for the phase diagram, the specific-heat function, and the transition enthalpy are related to recent experimental measurements on phospholipid bilayers mixed with synthetic transmembrane amphiphilic polypeptides or with gramicidin A.
AB - A statistical mechanical lattice model is proposed to describe the phase diagram of phospholipid bilayers with small transmembrane proteins or polypeptides. The model is based on the extended Pink-Green-Chapman model (Zhang et al. (1992) Phys. Rev. A 45, 7560-7567) for pure lipid bilayers which undergo a first-order gel-fluid phase transition. The interaction between the lipid bilayer and the protein or polypeptide is modelled using the concept of hydrophobic matching. The phase diagram has been derived by computer-simulation techniques which fully account for thermal density fluctuations and which operate on the level of the free-energy thereby permitting an accurate identification of the phase boundaries. The calculations predict a closed loop of gel-fluid coexistence with a lower critical mixing point. Specific-heat traces across the phase diagram are also presented. The theoretical results for the phase diagram, the specific-heat function, and the transition enthalpy are related to recent experimental measurements on phospholipid bilayers mixed with synthetic transmembrane amphiphilic polypeptides or with gramicidin A.
KW - Critical mixing
KW - Gramicidin A
KW - Lipid bilayer
KW - Phase diagram
KW - Polypeptide
U2 - 10.1016/0005-2736(93)90326-U
DO - 10.1016/0005-2736(93)90326-U
M3 - Journal article
C2 - 8466927
AN - SCOPUS:0027477887
VL - 1147
SP - 154
EP - 160
JO - B B A - Biomembranes
JF - B B A - Biomembranes
SN - 0005-2736
IS - 1
ER -
ID: 236891026