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dysferlin : ウィキペディア英語版
dysferlin

Dysferlin also known as dystrophy-associated fer-1-like protein is a protein that in humans is encoded by the ''DYSF'' gene.
Dysferlin is linked with skeletal muscle repair.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=8291 )〕 A defect in the DYSF gene, located on chromosome 2p12-14, results in several types of muscular dystrophy; including Miyoshi myopathy (MM), Limb-girdle muscular dystrophy type 2B (LGMD2B) and Distal Myopathy (DM). A reduction or absence of dysferlin, termed dysferlinopathy, usually becomes apparent in the third or fourth decade of life and is characterised by weakness and wasting of various voluntary skeletal muscles.〔(Leiden University Medical Center, Center for Human and Clinical Genetics - Dysferlin ) Retrieved 21 June 2007.〕
== Structure ==
The dysferlin protein is a roughly 220 kilodalton type-II transmembrane protein. It contains a large intracellular cytoplasmic N-terminal domain, an extreme C-terminal transmembrane domain, and a short C-terminal extracellular domain. The cytosolic domain of dysferlin is composed of 6 highly conserved C2 domains (C2A-F) which are conserved across several proteins within the ferlin family, including dysferlin homolog myoferlin. In fact, the C2 domain at any given position is more similar to the C2 domain at the corresponding position within other ferlin family members than the adjacent C2 domain within the same protein. This suggests that each individual C2 domain may in fact play a specific role in dysferlin function. A crystal structure of the C2A domain of dysferlin has been solved, and reveals that the C2A domain changes conformation when interacting with calcium ions, which is consistent with a growing body of evidence suggesting that the C2A domain plays a role in calcium-dependent lipid binding. In addition to the C2 domains, dysferlin also contains "Fer" and "Dysf" domains of largely unknown function.

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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