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PEDS Advance Access published online on June 8, 2004
Protein Engineering Design and Selection, doi:10.1093/protein/gzh045
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Received January 13, 2004
Revised March 25, 2004
Accepted May 13, 2004

Article

A stabilized variant of Streptomyces subtilisin inhibitor and its use in stabilizing subtilisin BPN

Philip J. Ganz 1, Mark D. Bauer 1, Yiping Sun 1, Angela M. Fieno 1, Raymond A. Grant 1, Paul E. Correa 1, Michael Laskowski Jr.2, Charles W. Saunders 1*

1 Corporate Research Division, Procter & Gamble Co., Miami Valley Laboratories, P. O. Box 538707, Cincinnati, OH 45253-8707
2 Department of Chemistry, Purdue University, West Lafayette, IN 47907-1393

* To whom correspondence should be addressed. E-mail: Saunders.CW{at}pg.com.


  Abstract

Protein protease inhibitors could potentially be used to stabilize proteases in commercial products such as liquid laundry detergents. However, many protein protease inhibitors are susceptible to hydrolysis inflicted by the protease. We have engineered Streptomyces Subtilisin Inhibitor (SSI) to resist proteolysis by adding an interchain disulfide bond and removing a subtilisin cleavage site at leucine 63. When these stabilizing changes were combined with changes to optimize the affinity for subtilisin, the resulting inhibitor provided complete protease stability for at least five months at 31° in a subtilisin-containing liquid laundry detergent and allowed full recovery of the subtilisin activity upon the dilution that occurs in a North American washing machine.

Keywords: Streptomyces Subtilisin Inhibitor, SSI, protease, laundry


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