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syntrophin : ウィキペディア英語版
syntrophin
The syntrophins are a family of five 60-kiloDalton proteins that are associated with dystrophin, the protein associated with Duchenne muscular dystrophy and Becker muscular dystrophy. The name comes from the Greek word ''syntrophos'', meaning "companion." The five syntrophins are encoded by separate genes and are termed α, β1, β2, γ1, and γ2. Syntrophin was first identified as a dystrophin-associated protein present in torpedo electric organ (originally called "58K protein"). Subsequently, alpha syntrophin was shown to be the predominant isoform in skeletal muscle where it is localized on the sarcolemma and enriched at the neuromuscular junction. The beta syntrophins and γ2 syntrophin are also present in skeletal muscle but also are in most other tissues. The expression of γ1 syntrophin is mostly confined to brain. The syntrophins are adapter proteins that use their multiple protein interaction domains (two pleckstrin homology domains and a PDZ domain) to localize a variety of signaling proteins (kinases, ion channels, water channels, nitric oxide synthase) to specific intracellular locations. α-Syntrophin binds to nNOS in the dystrophin associated glycoprotein complex in skeletal muscle cells. There it produces NO upon muscle contraction leading to dilation of the arteries in the local area.〔http://jcs.biologists.org/content/117/13/2627.full.pdf〕
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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