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- Characteristics of protease inhibitor produced by streptomyces fradiae SMF9
- Kim, Hyoung Tae 1,2, Suh, Joo Won 2,3, Lee, Key Joon 1,2
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Journal of Microbiology 1995;33(2):103-108
¹Department of Microbilology, Seoul National University, Seoul 151-742, Korea; ² Research Center for Molecular Microbiology, Seoul National University, Seoul 151-742, Korea; ³Institute of Biological Science, Myung Ji University, Youngin 449-728, Korea¹Department of Microbilology, Seoul National University, Seoul 151-742, Korea; ² Research Center for Molecular Microbiology, Seoul National University, Seoul 151-742, Korea; ³Institute of Biological Science, Myung Ji University, Youngin 449-728, Korea
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Corresponding author:
Lee, Key Joon ,
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Abstract
Streptomyces fradiae protease inhibitor (SFI) was purified effectively by preparative isoelectric focusing and hydroxyapatite chromatography. The molecular weight of SFI was estimated to be 1.7 kDa by SDS-PAGE and 1.8 kDa by molecular sieving HPLC. One hundred and sixty amino acid residues were determined from which molecular weight of SFI was calculated to be 17.054 Da and carbohydrate residue was not detected. SFI was calculated to be 17,064 Da and carbohydrate residue was not detected. SFI was a monomeric protein with two reactive sits, of which isoelectric point was pH 4.1. N-terminal amino acid sequence of SFI had homology with SSI (Streptomyces subsilisin inhibitor) and other protease inhibitors produced by Streptomyces.
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