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- W2018572968 abstract "Keratin-agarose plate and keratin-polyacrylamide enzymography methods were developed to demonstrate proteolytic digestion of epidermal keratin. By applying these methods, keratin hydrolase was purified from Tris-buffered saline extract of psoriatic scales by 50% ammonium sulfate precipitation, passage through a lysine-Sepharose column, DEAE-Sepharose, Sephacryl S-200, high-performance cation-exchange chromatography on Mono S, and aprotinin-Sepharose affinity chromatography. The final preparation demonstrated a single protein band at molecular weight 30,000 judged by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Furthermore, in keratin-polyacrylamide slab gels, the purified enzyme preparation showed a translucent band at molecular weight 30,000, indicating keratin digestion. Keratin hydrolase digested reassembled epidermal keratin as well, whereas it had no effect on guinea pig hair keratin. The enzyme demonstrated a high level of hydrolytic activity on Ile-Pro-Arg-p-nitroanilide and other peptidyl arginine substrates, while it showed a low level of activity on Val-Leu-Lys-p-nitroanilide, and no activity on Arg-Pro-Tyr-p-nitroanilide, Glu-Pro-Val-p-nitroanilide, or Ala-Ala-Ala-p-nitroanilide. The keratin hydrolase was a serine proteinase, inactivated by diisopropylfluorophosphate, phenylmethylsulfonyl fluoride, tosyl-lysyl-chloromethyl ketone, antipain, leupeptin, soybean trypsin inhibitor, aprotinin, and p-aminobenzamidine. The keratinolytic activity was not detected in normal epidermal extract." @default.
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- W2018572968 date "1985-06-01" @default.
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- W2018572968 title "Purification and characterization of keratin hydrolase in psoriatic epidermis: Application of keratin-agarose plate and keratin-polyacrylamide enzymography methods" @default.
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- W2018572968 doi "https://doi.org/10.1016/0003-2697(85)90281-7" @default.
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