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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Skeletal muscle-specific calpain, p49: structure and physiological function.

Recent studies indicate that calpain, a cytosolic Ca2+-dependent protease, constitutes a large family comprising ubiquitous, tissue-specific, and atypical calpains. p94 is a homologue of the catalytic large subunit of calpain, expressed predominantly in skeletal muscle. Recently, p94 has been found to interact with connectin/titin, a muscle elastic protein, and its gene has been identified as being responsible for limb-girdle muscular dystrophy type 2A. The loss of function of a calpain species eventually leads to the activation of proteases including other calpain species responsible for muscle degradation. p94 does not form a complex with the small subunit of calpain ( 30K), but exists as a homodimer. This, together with other results, led us to consider a novel mechanism for the activation of calpain, a Ca2+-induced subunit rearrangement.[1]

References

  1. Skeletal muscle-specific calpain, p49: structure and physiological function. Kinbara, K., Sorimachi, H., Ishiura, S., Suzuki, K. Biochem. Pharmacol. (1998) [Pubmed]
 
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