Amphiphysin 2 (Bin1) and T-tubule biogenesis in muscle

Amphiphysin 2 (Bin1) and T-tubule biogenesis in muscle
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DOI:
10.1126/science.1071362
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发表时间:
2002-08-16
期刊:
影响因子:
56.9
通讯作者:
De Camilli, P
De Camilli, P
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lee, EY;Marcucci, M;De Camilli, P

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在横纹肌中,质膜形成管状内陷(横小管或T小管),其在去极化 - 收缩偶联中起作用。小窝蛋白 - 3和网格蛋白相关蛋白(amphiphysin)与它们的生物发生有关。网格蛋白相关蛋白异构体在内吞位点的膜变形中具有假定的作用。当在非肌细胞中表达时,一种集中在T小管的网格蛋白相关蛋白2异构体诱导质膜管状内陷。这种特性需要第10外显子,即一个磷酸肌醇结合模块。在发育中的肌管中,网格蛋白相关蛋白2和小窝蛋白 - 3分别分布在T小管系统的管状和囊泡部分。这些发现支持了网格蛋白相关蛋白在T小管处的双层变形特性的作用,并且更普遍地支持了网格蛋白相关蛋白在膜变形中的生理作用。
In striated muscle, the plasma membrane forms tubular invaginations (transverse tubules or T-tubules) that function in depolarization-contraction coupling. Caveolin-3 and amphiphysin were implicated in their biogenesis. Amphiphysin isoforms have a putative role in membrane deformation at endocytic sites. An isoform of amphiphysin 2 concentrated at T-tubules induced tubular plasma membrane invaginations when expressed in nonmuscle cells. This property required exon 10, a phosphoinositide-binding module. In developing myotubes, amphiphysin 2 and caveolin-3 segregated in tubular and vesicular portions of the T-tubule system, respectively. These findings support a role of the bilayer-deforming properties of amphiphysin at T-tubules and, more generally, a physiological role of amphiphysin in membrane deformation.