Isolation of nebulin from rabbit skeletal muscle and its interaction with actin.

Isolation of nebulin from rabbit skeletal muscle and its interaction with actin.
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DOI:
10.1155/2010/108495
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发表时间:
2010
影响因子:
--
通讯作者:
Kimura S
Kimura S
中科院分区:
其他
文献类型:
--
作者:
Chitose R;Watanabe A;Asano M;Hanashima A;Sasano K;Bao Y;Maruyama K;Kimura S

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Nebulin是约800 kDa的丝状蛋白,其结合脊椎动物骨骼肌肌节的整个细丝。除了通过用SDS直接溶解肌原纤维以完全变性的形式之外,不能从肌肉中分离出星云蛋白,因为星云蛋白在盐条件下几乎不溶。在本研究中,星云蛋白溶解的盐溶液中含有1 M尿素和纯化的DEAE-Toyoprophin柱层析通过4 M尿素洗脱。星云蛋白的旋转阴影图像显示了纠缠在一起的类星云粒子,直径约为20纳米。纯化后的星云蛋白与肌动蛋白丝结合形成松散的纤维束。已证实星云蛋白结合肌动蛋白、α-辅肌动蛋白、β-辅肌动蛋白和原调节蛋白,但不结合肌钙蛋白或原肌球蛋白。数据表明,全长星云蛋白也可以获得一个功能性的,大概是天然的形式,使用重组亚片段的实验数据验证。
Nebulin is about 800 kDa filamentous protein that binds the entire thin filament of vertebrate skeletal muscle sarcomeres. Nebulin cannot be isolated from muscle except in a completely denatured form by direct solubilization of myofibrils with SDS because nebulin is hardly soluble under salt conditions. In the present study, nebulin was solubilized by a salt solution containing 1 M urea and purified by DEAE-Toyopearl column chromatography via 4 M urea elution. Rotary-shadowed images of nebulin showed entangled knit-like particles, about 20 nm in diameter. The purified nebulin bound to actin filaments to form loose bundles. Nebulin was confirmed to bind actin, α-actinin, β-actinin, and tropomodulin, but not troponin or tropomyosin. The data shows that full-length nebulin can be also obtained in a functional and presumably native form, verified by data from experiments using recombinant subfragments.
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