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Regulation of calpain by phosphorylation has often been suggested, but has proved difficult to detect. Calpains extracted from mammalian tissue are reported to contain 2-4 mol phosphate/mol of enzyme distributed over multiple sites, but phosphate groups are not detectable in the X-ray structures of recombinant calpain. Some serine and threonine residues in the large subunit of rat m-calpain were converted...
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