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The results suggest that the terminal differentiation defects, specifically, increased proliferation and decreased denucleation are responsible for the development of lens opacity in N101D lenses.

Keratinase (ker BL) from Bacillus licheniformis ER-15 was cloned into vector pEZZ18 for extracellular expression in Escherichia coli HB101. Recombinant keratinase was secreted with high specific activity (75 units/mg) under non-inducible conditions after 36 h at 37 degrees C and 300 rpm in a shake flask. Protein was concentrated and, subsequently, purified by ion-exchange chromatography using Q-sepharose with 95.8% yield. The recombinant keratinase was a serine protease and most active in the pH range of 8-12 and at 60 degrees C. The enzyme was stable over a wide pH range of 4-12 for 3 h. ker BL degraded bovine serum albumin, casein, azocasein, gelatin, and feather. E. coli HB101 harboring pEZZ18 ker BL2 degraded chicken feather completely within 24 h at 37 degrees C.

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