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Secretion of a trypsin-like thiol protease by a new keratinolytic strain of Bacillus licheniformis
Authors:M Rozs ,L Manczinger,Cs Vá  gvö  lgyi,F Kevei
Affiliation:Department of Microbiology, University of Szeged, P.O. Box 533, H-6701, Szeged, Hungary. rozsm@bio.u-szeged.hu
Abstract:When cultured in feather-containing broth with a growth optimum of pH 7.0 and 47 degrees C, a Bacillus licheniformis strain exhibited a high chicken feather-degrading activity. A trypsin-like protease was isolated from its ferment broth and was partially characterized. The enzyme was constitutively secreted and was highly active towards N-benzoyl-Phe-Val-Arg-p-nitroanilide as chromogenic substrate. Its pH optimum was 8.5 and it exhibited the highest activity at 52 degrees C. Fractionation on Sephadex G-100 column revealed that its molecular mass was about 42 kDa. The enzyme, which is new for the genus Bacillus, is a thiol protease, as tosyl-L-phenylalanine chloromethyl ketone, tosyl-L-lysine chloromethyl ketone, phenylmethylsulfonyl fluoride and ethylenediamine tetraacetate did not inhibit it, while HgCl2 and para-chloromercuribenzoate lowered its activity.
Keywords:Keratinase    Protease secretion    Bacillus licheniformis
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