Dystrophin contains multiple independent membrane-binding domains.

Dystrophin contains multiple independent membrane-binding domains.
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肌养蛋白含有多个独立的膜结合域。

DOI:
10.1093/hmg/ddw210
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发表时间:
2016
影响因子:
3.5
通讯作者:
Lai,Yi
Lai,Yi
中科院分区:
生物学2区
文献类型:
--
作者:
Zhao,Junling;Kodippili,Kasun;Yue,Yongping;Hakim,ChadyH;Wasala,Lakmini;Pan,Xiufang;Zhang,Keqing;Yang,NoraN;Duan,Dongsheng;Lai,Yi

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肌营养不良蛋白是一种大的肌上皮蛋白。它的缺失导致杜氏肌营养不良症(DMD)。肌营养不良蛋白与肌膜的结合是保护肌肉免受收缩性损伤所必需的。长期以来,人们认为肌营养不良蛋白的膜结合依赖于其富含半胱氨酸(CR)的结构域。在这里,我们提供的活体证据表明,肌营养不良蛋白含有三个额外的膜结合结构域,包括谱蛋白样重复序列(R)1-3, R10-12和c -末端(CT)。为了系统地研究肌营养不良蛋白的膜结合,我们将全长肌营养不良蛋白分成十个片段,并通过腺相关病毒介导的基因转移检测每个片段的亚细胞定位。在骨骼肌中,R1-3、CR结构域和CT仅局限于肌膜。R10-12同时显示细胞质和肌层定位。重要的是,在小鼠和犬的肌肉中,不依赖于cr的膜结合是保守的。cr介导的膜相互作用的一个关键功能是肌营养不良蛋白相关糖蛋白复合物(DGC)的组装。虽然R1-3和R10-12没有恢复DGC,但令人惊讶的是,单独CT足以在肌膜处建立DGC。进一步的研究表明,R1-3和CT也与心脏的肌膜结合,尽管相对较弱。总之,我们的研究提供了第一个结论性的活体证据,证明肌营养不良蛋白含有多个独立的膜结合结构域。这些结构和功能独特的膜结合结构域为肌营养不良蛋白作为减震器和信号中枢提供了分子框架。我们的研究结果不仅揭示了肌营养不良蛋白的生物学和DMD的发病机制,而且为合理设计最小化的肌营养不良蛋白用于DMD基因治疗提供了基础。
Dystrophin is a large sub-sarcolemmal protein. Its absence leads to Duchenne muscular dystrophy (DMD). Binding to the sarcolemma is essential for dystrophin to protect muscle from contraction-induced injury. It has long been thought that membrane binding of dystrophin depends on its cysteine-rich (CR) domain. Here, we providein vivoevidence suggesting that dystrophin contains three additional membrane-binding domains including spectrin-like repeats (R)1-3, R10-12 and C-terminus (CT). To systematically study dystrophin membrane binding, we split full-length dystrophin into ten fragments and examined subcellular localizations of each fragment by adeno-associated virus-mediated gene transfer. In skeletal muscle, R1-3, CR domain and CT were exclusively localized at the sarcolemma. R10-12 showed both cytosolic and sarcolemmal localization. Importantly, the CR-independent membrane binding was conserved in murine and canine muscles. A critical function of the CR-mediated membrane interaction is the assembly of the dystrophin-associated glycoprotein complex (DGC). While R1-3 and R10-12 did not restore the DGC, surprisingly, CT alone was sufficient to establish the DGC at the sarcolemma. Additional studies suggest that R1-3 and CT also bind to the sarcolemma in the heart, though relatively weak. Taken together, our study provides the first conclusivein vivoevidence that dystrophin contains multiple independent membrane-binding domains. These structurally and functionally distinctive membrane-binding domains provide a molecular framework for dystrophin to function as a shock absorber and signaling hub. Our results not only shed critical light on dystrophin biology and DMD pathogenesis, but also provide a foundation for rationally engineering minimized dystrophins for DMD gene therapy.
抗肌营养不良蛋白富含半胱氨酸和 COOH 末端的结构域对于肌膜定位至关重要吗?
DOI: 10.1172/jci115640
发表时间: 1992
期刊: The Journal of clinical investigation
影响因子: --
作者:
D. Récan;Philippe Chafey;F. Leturcq;J. Hugnot;Nathalie Vincent;Fernando;Tom;Huguette;Collin;Dominique;Simon;Paul Czernichow;B. LouiseV.;Nicholson;Michel Fardeau;Jean;Jamel Chelly
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Dp71,杜氏肌营养不良症基因的非肌肉产物,与细胞膜相关
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发表时间: 1993
期刊: FEBS Letters
影响因子: 3.5
作者:
D. Rapaport;D. Greenberg;M. Tal;D. Yaffe;U. Nudel
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抗肌营养不良蛋白的富含半胱氨酸和 C 末端结构域对于小鼠的正常肋节定位来说不是必需的
DOI: 10.1007/bf01969430
发表时间: 1996
影响因子: 3
作者:
M. Maconochie;A. H. Simpkins;E. Damien;G. Coulton;A. Greenfield;S. Brown
通讯作者: S. Brown
鉴定 α-肌营养蛋白与肌营养蛋白三联体、肌营养不良蛋白和肌营养不良蛋白的结合。
DOI: --
发表时间: 1995
影响因子: 4.8
作者:
B. Yang;D. Jung;J. Rafael;J. Chamberlain;K. Campbell
通讯作者: K. Campbell
α-肌营养蛋白与肌营养蛋白三联体、肌营养不良蛋白和肌养蛋白结合的鉴定 (*)
DOI: 10.1074/jbc.270.10.4975
发表时间: 1995
期刊: The Journal of Biological Chemistry
影响因子: --
作者:
Bin Yang;D. Jung;J. Rafael;J. Chamberlain;K. Campbell
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