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Abstract
An isolate of Streptomyces tendae produced a extracellular protease which was purified to apparent homogeneity giving a single band on SDS-PAGE with a molecular mass of 21 kDa. Optimum activity was at 70 degrees C and pH 6. It was stable at 55 degrees C for 30 min and between pH 4 and 9. It was resistant to neutral detergents and organic solvents such as Triton X-100, Tween 80, methanol, ethanol, acetone, and 2-propanol at 5% (v/v). The enzyme was completely inhibited by 5 mM PMSF, indicating it to be a serine protease. N-terminal amino acid sequence did not show any homology with other known proteolytic enzymes. The protease may therefore be a novel neutral serine protease, which is stable at high temperature and over a broad range of pH.
Published Version
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