Abstract |
The thermostability of subtilisin J, an extracellular serine protease secreted from Bacillus stearothermophilus, has been improved by changing the primary autolysis site of the Asp-49 mutant protein. Previously we have shown that the Asp-49 mutant protein has proteolytic activity, but so unstable that it was primarily autolyzed in Tyr-58-Gln-59 peptide bond during cultivation (Jang et al. Biochim. Biophys. Acta. 1162, 233-235 1993). In the present study, to mitigate the autolytic degradation and increase the thermostability, we deleted the Tyr-58 residue using the Asp-49 mutant as a template. This mutant (Asp-49/delta Tyr-58 mutant) protein showed an improved resistance to heat treatment without changing the catalytic efficiency of the enzyme. These results show that change of primary autolysis site can stabilize the subtilisin.
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Authors | K H Bae, J S Jang, K S Park, S H Lee, S M Byun |
Journal | Biochemical and biophysical research communications
(Biochem Biophys Res Commun)
Vol. 207
Issue 1
Pg. 20-4
(Feb 06 1995)
ISSN: 0006-291X [Print] United States |
PMID | 7857265
(Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Recombinant Proteins
- subtilisin J
- Serine
- Serine Endopeptidases
- Subtilisins
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Topics |
- Amino Acid Sequence
- Autolysis
- Enzyme Stability
- Geobacillus stearothermophilus
(enzymology)
- Hot Temperature
- Kinetics
- Molecular Sequence Data
- Mutagenesis, Site-Directed
- Recombinant Proteins
(biosynthesis, chemistry, metabolism)
- Sequence Homology, Amino Acid
- Serine
- Serine Endopeptidases
(chemistry)
- Subtilisins
(biosynthesis, chemistry, metabolism)
- Thermodynamics
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