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An enzyme which oxidizes six-carbon sugars has been studied at varying pH. The Km rises sharply...

An enzyme which oxidizes six-carbon sugars has been studied at varying pH. The Km rises sharply when the pH drops below 4.5 or when the pH rises above 10.5 . What amino acids might be present in the active site of this enzyme and what role(s) might they play?

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Answer #1

i believe the correct answers to be:

Glutamic acid (pka = 4.5)

and Lysine (pka =10.5)

as at these pH, these aminoacids will show buffering capacity but once the pH crosses buffering capacity, the change in pH would be sudden.

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