Glucose isomerases with an altered ph optimum

Details Glucose isomerases with an altered ph optimum Glucose isomerases with an altered ph optimum

C - Chemistry, Metallurgy

12

N

195/139, 195/39,

C12N 9/92 (2006.01) C12P 19/24 (2006.01) C12P 41/00 (2006.01)

Patent

CA 2033658

A method for selecting amino acid residues is disclosed which upon replacement will give rise to an enzyme with an altered pH optimum. The method is specific for metalloenzymes which are inactivated at low pH due to the dissociation of the metal ions. The method is based on altering the pK a of the metal coordinating ligands or altering the K sss for the metal binding. New glucose isomerases with an altered pH optimum are provided according to this method. These altered properties enable starch degradation to be performed at lower pH values.

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