Differential association of syntrophin pairs with the dystrophin complex.

Differential association of syntrophin pairs with the dystrophin complex.
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DOI:
10.1083/jcb.138.1.81
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发表时间:
1997-07-14
影响因子:
7.8
通讯作者:
Froehner, SC
Froehner, SC
中科院分区:
生物学1区
文献类型:
--
作者:
Peters, MF;Adams, ME;Froehner, SC

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合营养素是细胞内肌营养不良蛋白相关蛋白的一个多基因家族,包括α1、β1和β2三种亚型。基于它们的结构域组织和与神经元一氧化氮合酶的关联,syntrophins被认为是模块适配器,通过与肌营养不良蛋白复合物的关联将信号蛋白募集到膜上。利用新的小鼠β1-syntrophin cDNA序列,以及先前分离的α1-和β2-syntrophins的cDNA,我们制备了异构体特异性抗体,以研究这三种syntrophins的表达、骨骼肌定位和肌营养不良蛋白家族关联。大多数组织表达多种syntrophin亚型。在小鼠腓肠肌骨骼肌中,α1-和β1-syntrophin主要集中在神经肌肉连接处,但也存在于突触外肌膜上。β1-syntrophin局限于快速收缩肌纤维,这是杜氏肌营养不良症中最先退化的纤维。β2-syntrophin主要局限于神经肌肉连接处。α1-和β1-syntrophins的肌层分布提示与肌营养不良蛋白和肌营养不良蛋白有关,而这三种syntrophins都可能在神经肌肉交界处与肌营养不良蛋白相关。从骨骼肌中免疫分离的肌营养蛋白复合物富含β1-和β2-syntrophins,而肌营养不良蛋白复合物主要含有α1-和β1-syntrophins。肌营养不良蛋白复合物含有肌营养不良蛋白和α1-和β1-合营养素。根据这些结果,我们提出了一种模型,其中肌营养不良蛋白-肌营养不良蛋白复合物与两种syntrophins相关。由于单个syntrophins对肌营养不良蛋白(dystrophin)、肌营养不良蛋白(dystrobrevin)或肌营养不良蛋白(utrophin)没有内在的结合特异性,因此观察到的syntrophins的优先配对必须依赖于外在的调节机制。
The syntrophins are a multigene family of intracellular dystrophin-associated proteins comprising three isoforms, α1, β1, and β2. Based on their domain organization and association with neuronal nitric oxide synthase, syntrophins are thought to function as modular adapters that recruit signaling proteins to the membrane via association with the dystrophin complex. Using sequences derived from a new mouse β1-syntrophin cDNA, and previously isolated cDNAs for α1- and β2-syntrophins, we prepared isoform-specific antibodies to study the expression, skeletal muscle localization, and dystrophin family association of all three syntrophins. Most tissues express multiple syntrophin isoforms. In mouse gastrocnemius skeletal muscle, α1- and β1-syntrophin are concentrated at the neuromuscular junction but are also present on the extrasynaptic sarcolemma. β1-syntrophin is restricted to fast-twitch muscle fibers, the first fibers to degenerate in Duchenne muscular dystrophy. β2-syntrophin is largely restricted to the neuromuscular junction. The sarcolemmal distribution of α1- and β1-syntrophins suggests association with dystrophin and dystrobrevin, whereas all three syntrophins could potentially associate with utrophin at the neuromuscular junction. Utrophin complexes immunoisolated from skeletal muscle are highly enriched in β1- and β2-syntrophins, while dystrophin complexes contain mostly α1- and β1-syntrophins. Dystrobrevin complexes contain dystrophin and α1- and β1-syntrophins. From these results, we propose a model in which a dystrophin–dystrobrevin complex is associated with two syntrophins. Since individual syntrophins do not have intrinsic binding specificity for dystrophin, dystrobrevin, or utrophin, the observed preferential pairing of syntrophins must depend on extrinsic regulatory mechanisms.
DOI: 10.1016/0896-6273(93)90157-m
发表时间: 1993-09-01
期刊: NEURON
影响因子: 16.2
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通讯作者: FROEHNER, SC
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期刊: SCIENCE
影响因子: 56.9
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发表时间: 1989-10
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发表时间: 1996-07-01
期刊: NEURON
影响因子: 16.2
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