Molecular Insight into the Line Tension of Bilayer Membranes Containing Hybrid Polyunsaturated Lipids.
Molecular Insight into the Line Tension of Bilayer Membranes Containing Hybrid Polyunsaturated Lipids.
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对含有混合多不饱和脂质的双层膜的线张力的分子洞察。
DOI：
10.1021/acs.jpcb.6b10836
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
C. Pastorino
中科院分区：
文献类型：
--
作者：
C. M. Rosetti;G. Montich;C. Pastorino
线张力(γ)是表征膜结构和动力学的重要参数。有人认为，含有混合饱和和不饱和酰基链的杂化脂类通过不同的机制参与γ的松弛。在这项工作中，我们使用粗粒Martini模型的分子动力学模拟来测量液体-有序-液体-无序(LO-LD)膜中的γ，其中杂化多不饱和脂质PAPC(4：0-5：4PC)与DAPC(di5：4PC)(即XH)的相对比例越来越大。我们还计算了LO-LD厚度失配、倾斜模数和弯曲模数对γ的弹性贡献，正如理论预测的那样。我们发现，XH的增加降低了整体γ值和对线张力的弹性贡献。对弹性线张力的影响是由减少的疏水失配驱动的。由于XH的增加而引起的相的弹性常数的变化产生了略大的弹性γ项。除了这种弹性能，在这些模型膜中还发现了对γ的其他主要贡献。增加XH会降低弹性和非弹性对γ的贡献。最后，正如理论结果所预测的那样，PAPC还起到线性作用，通过界面效应来松弛γ。这项研究深入了解了在含有多不饱和混合脂质的双层中，不同的能量项对γ的实际贡献。
Line tension (γ) is a key parameter for the structure and dynamics of membrane domains. It was proposed that hybrid lipids, with mixed saturated and unsaturated acyl chains, participate in the relaxation of γ through different mechanisms. In this work, we used molecular dynamics simulations of the coarse-grained MARTINI model to measure γ in liquid-ordered-liquid-disordered (Lo-Ld) membranes, with increasingly larger relative proportion of the hybrid polyunsaturated lipid PAPC (4:0-5:4PC) to DAPC (di5:4PC) (i.e., XH). We also calculated an elastic contribution to γ by the Lo-Ld thickness mismatch, tilt moduli, and bending moduli, as predicted by theory. We found that an increase in XH decreased the overall γ value and the elastic contribution to line tension. The effect on the elastic line tension is driven by a reduced hydrophobic mismatch. Changes in the elastic constants of the phases due to an increase in XH produced a slightly larger elastic γ term. In addition to this elastic energy, other major contributions to γ are found in these model membranes. Increasing XH decreases both elastic and nonelastic contributions to γ. Finally, PAPC also behaves as a linactant, relaxing γ through an interfacial effect, as predicted by theoretical results. This study gives insight into the actual contribution of distinct energy terms to γ in bilayers containing polyunsaturated hybrid lipids.
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DOI：
10.1016/j.bbamem.2013.05.020
发表时间：
2013-09
期刊：
Biochimica et biophysica acta
影响因子：
--
作者：
Konyakhina TM;Wu J;Mastroianni JD;Heberle FA;Feigenson GW
通讯作者：
Feigenson GW
影响因子：
3.4
作者：
Petruzielo, Robin S.;Heberle, Frederick A.;Drazba, Paul;Katsaras, John;Feigenson, Gerald W.
通讯作者：
Feigenson, Gerald W.
DOI：
10.1103/physreve.89.022702
发表时间：
2014-02
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
Amazon JJ;Feigenson GW
通讯作者：
Feigenson GW
相分离脂质双层中的叶间耦合和结构域注册。
影响因子：
3.4
作者：
Putzel,GGarbes;Uline,MarkJ;Szleifer,Igal;Schick,M
通讯作者：
Schick,M
脂膜结构域的粗化动力学。
影响因子：
3.4
作者：
Stanich,CynthiaA;Honerkamp-Smith,AureliaR;Putzel,GregoryGarbès;Warth,ChristopherS;Lamprecht,AndreaK;Mandal,Pritam;Mann,Elizabeth;Hua,Thien-AnD;Keller,SarahL
通讯作者：
Keller,SarahL