Simulations of membrane tubulation by lattices of amphiphysin N-BAR domains.

Simulations of membrane tubulation by lattices of amphiphysin N-BAR domains.
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DOI:
10.1016/j.str.2009.03.016
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发表时间:
2009-06-10
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Schulten K
Schulten K
中科院分区:
其他
文献类型:
--
作者:
Yin Y;Arkhipov A;Schulten K

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细胞中存在多种形状的膜区室,它们通常由细胞蛋白质塑造而成。特别是,BAR结构域超家族的蛋白质在体内参与膜塑造过程,并且在体外也能将低曲率的膜脂质体重塑为高曲率的管状物和囊泡。在此,我们通过总计超过1毫秒的计算机模拟展示了涉及平行排列的 amphiphysin N - BAR结构域的晶格如何将平面膜塑造为管状物。获得了由N - BAR结构域晶格形成膜管的100微秒过程的高度详细的动态图像。对诱导多种膜曲率(半径约为15至100纳米)的晶格类型进行了探究。结果表明,多种晶格类型对于有效的膜弯曲是可行的。
Membrane compartments of manifold shapes are found in cells, often sculpted by cellular proteins. In particular, proteins of the BAR domain superfamily participate in membrane sculpting processes in vivo and reshape also in vitro low-curvature membrane liposomes into high-curvature tubes and vesicles. Here we show by means of computer simulations totaling over 1 millisecond, how lattices involving parallel rows of amphiphysin N-BAR domains sculpt flat membranes into tubes. A highly detailed, dynamic picture of the 100-microsecond formation of membrane tubes by lattices of N-BAR domains is obtained. Lattice types inducing a wide range of membrane curvatures, with radii approximately 15 to 100 nm, are explored. The results suggest that multiple lattice types are viable for efficient membrane bending.
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影响因子: 15
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