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- W2000369316 abstract "Ubiquitous type m-calpain and lens specific Lp82 calpain were separated and partially purified from fetal bovine lens and the enzymatic characteristics were compared. Lens m-calpain required 200 microM calcium for 1/2 maximal activity, while Lp82 required 30 microM. Both types of calpains were inhibited by 0.1 mM E64, and 5 mM iodoacetamide, but not by 1 mM phenylmethylsulfonyl fluoride. Lp82 was insensitive to 1 microM calpastatin peptide while m-calpain was effectively inhibited. In the presence of calcium, m-calpain lost most of its activity within 2 hr, while Lp82 was continually active for 18 hr. Both calpains cleaved the natural substrates betaA3 and alphaB crystallins in a similar manner. However, incubation of alphaA crystallin with m-calpain removed ten amino acid residues from its C-terminus, while incubation with Lp82 removed only five residues. The latter truncation product of alphaA was also found in vivo. These data suggested that Lp82 may have a more important role than m-calpain in modification of crystallins during lens maturation." @default.
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- W2000369316 date "2001-11-01" @default.
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- W2000369316 title "Purification and Characterization of Lens Specific Calpain (Lp82) from Bovine Lens" @default.
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- W2000369316 doi "https://doi.org/10.1006/exer.2001.1071" @default.
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