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A single mutation within a Ca(2+) binding loop increases proteolytic activity, thermal stability, and surfactant

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Protein engineering enhanced alkaline serine protease KP-43 for laundry detergents. A Tyr195Cys mutation increased proteolytic activity, thermal, and surfactant stability, making it ideal for detergent applications.

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Area of Science:

  • Biochemistry
  • Protein Engineering
  • Enzymology

Background:

  • Alkaline serine protease KP-43 is oxidatively stable.
  • Existing proteases have limitations in laundry detergent applications.

Purpose of the Study:

  • Improve enzymatic properties of KP-43 for laundry detergents.
  • Enhance proteolytic activity and stability through protein engineering.

Main Methods:

  • Mutagenesis of KP-43 gene using error-prone PCR.
  • Screening for improved enzyme variants.
  • Biochemical assays to determine specific activity and stability.
  • Crystal structure analysis of KP-43.

Main Results:

  • Identified a Tyr195Cys mutant with increased specific activity toward casein (1.3-fold at pH 10).
  • Tyr195Cys mutation significantly enhanced thermal and surfactant stability under oxidizing conditions.
  • Structural analysis indicated the mutation affects Ca(2+) binding loop interaction without altering the active center.

Conclusions:

  • The Tyr195Cys mutation enhances KP-43's interaction with Ca(2+), increasing protein stability.
  • The modified enzyme exhibits superior proteolytic activity, thermal stability, and surfactant stability.
  • KP-43 Tyr195Cys mutant is a promising candidate for laundry detergent applications.