The serine protease, subtilisin, is used in some laundry detergents to help remove protein-type stains.

(a) What unusual kind of stability does this suggest for subtilisin?

(b) What is the structure of the catalytic site in subtilisin?

(c) Draw the pH profile for subtilisin activity, if the assumed pH of hot tap water in a washer is ca. 6.5.

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