We have previously reported the free radical scavenging activity of a protein with a molecular weight of 90 kDa (90kDa protein) isolated from the scallop shell. In this study, we found that the 90-kDa protein also shows protease activity. The protein was most active at an alkali pH and at 60°C, and its activity was inhibited by serine protease inhibitors, phenylmethylsulfonyl fluoride and diisopropyl fluorophosphate. Its activity was maintained at approximately 90% of the initial activity, even in the presence of denaturants such as 1% sodium dodecyl sulfate (SDS) and 6 M urea. Substrate specificity analysis performed using synthetic peptides showed that the 90-kDa protein cleaves preferentially at Lys-X and Arg-X bonds. A portion of Phe-X bond was also cleaved by the 90-kDa protein. When casein was treated with the 90-kDa protein, it was digested at the Arg-X, Lys-X, and Phe-X bonds. The 90-kDa protein may be useful for proteome analysis because it retains its activity even in the presence of 1% SDS. To the best of our knowledge, this is the first report of a protease found in scallop shell.
Alkaline protease scallop shell shell matrix protein thermostable.
Birincil Dil | Türkçe |
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Bölüm | Makaleler |
Yazarlar | |
Yayımlanma Tarihi | 7 Temmuz 2014 |
Yayımlandığı Sayı | Yıl 2014 Cilt: 14 Sayı: 1 |