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Mutations of DYSF, the gene encoding dysferlin, cause two types of muscular dystrophies: limb-girdle muscu- lar dystrophy type 2B and Miyoshi myopathy. Recent work suggests a role of dysferlin in membrane repair and demon- strates that defective membrane repair is a novel mechanism of muscle degeneration. We used the tandem affinity purifi- cation method for the purification of proteins interacting with dysferlin. Three interacting partners were identified by this method (striatin, adaptin alpha, utrophin) and were confirmed by co-immunoprecipitations. All three proteins play a role in vesicle trafficking. Knowing the interacting partners of dysferlin will help to understand how muscle cells repair tears in the sarcolemma and will give a deeper insight into this very important cell function. At the same time the identified proteins could serve as potential candidates for other muscular dystrophies and muscle-related diseases with unknown ae- tiology.

Identification of Proteins Interacting with Dysferlin Using the Tandem Affinity Purification Method