TY - JOUR
T1 - Model for inactivation of α-amylase in the presence of salts
T2 - Theoretical and experimental studies
AU - Lecker, Douglas N.
AU - Khan, Arshad
PY - 1998/7
Y1 - 1998/7
N2 - According to a previous report, only the smaller anions, like chlorides, that readily fit into the anion binding site of α-amylase can cause an increased stability (relative to enzymes in aqueous solution), and the anions that are too large to fit into the binding site should have no effect on the enzyme. Even though the results on large benzoate ions are consistent with the above postulate, much larger citrate ions from sodium and potassium citrate show stabilization at moderate salt concentrations and follow an expected trend of low stability only at large salt concentrations. The citrate ions from ammonium citrate exhibit very little to almost no stabilization. In addition, low to moderate concentrations of NaCl that provide a large stability to the enzyme show almost no stability in the presence of EDTA. We put forward an inactivation model that involves a reversible dissociation of the anion bound to the protein, followed by a reversible inactivation step of calcium ion dissociation and an irreversible denaturation step of apoenzyme.
AB - According to a previous report, only the smaller anions, like chlorides, that readily fit into the anion binding site of α-amylase can cause an increased stability (relative to enzymes in aqueous solution), and the anions that are too large to fit into the binding site should have no effect on the enzyme. Even though the results on large benzoate ions are consistent with the above postulate, much larger citrate ions from sodium and potassium citrate show stabilization at moderate salt concentrations and follow an expected trend of low stability only at large salt concentrations. The citrate ions from ammonium citrate exhibit very little to almost no stabilization. In addition, low to moderate concentrations of NaCl that provide a large stability to the enzyme show almost no stability in the presence of EDTA. We put forward an inactivation model that involves a reversible dissociation of the anion bound to the protein, followed by a reversible inactivation step of calcium ion dissociation and an irreversible denaturation step of apoenzyme.
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U2 - 10.1021/bp980024y
DO - 10.1021/bp980024y
M3 - Article
C2 - 9694685
AN - SCOPUS:0032127832
SN - 8756-7938
VL - 14
SP - 621
EP - 625
JO - Biotechnology progress
JF - Biotechnology progress
IS - 4
ER -