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• W2162772087 abstract "Detailed circular dichroism (CD), scattering and quenching studies, 1-anilinonaphthalene-8-sulfonate (ANS) binding, irreversible thermoinactivation, activity measurements and proteolytic digestion of bacterial alpha-amylases have been carried out to elucidate the effect of trifluoroethanol (TFE) on the structure of these enzymes. Under high concentrations of TFE both of the alpha-amylases, a thermostable alpha-amylase from Bacillus licheniformis (BLA) and its mesophilic counterpart from Bacillus amyloliquefaciens (BAA), acquire partially folded state characterized by an enhanced content of the secondary structure (helix) and reduced tertiary structures. According to ANS binding studies, we suggest that the TFE states induced by TFE/water mixture are not the molten globule state in the alpha-amylase folding pathway. In addition, data shows significant reversible aggregation of both enzymes in TFE/water mixtures with concentration between 10 and 60% (v/v). However, reversibility is more in case of BAA. As expected, in the absence of TFE, the thermophilic enzyme compared to mesophilic enzyme, shows a greater resistance to digestion by thermolysin. With respect to fluorescence quenching by acrylamide and potassium iodide, the thermophilic enzyme, BLA, is characterized by higher structural flexibility as compared to the BAA. On the other hand, in the presence of TFE, the enzymes are digested by protease to produce large protein fragments. It is proposed that highly helical secondary structures, acquired by BAA and BLA when dissolved in aqueous TFE, prevent binding and adaptation of the protein substrate at the active site of the protease." @default.
• W2162772087 created "2016-06-24" @default.
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• W2162772087 date "2004-06-01" @default.
• W2162772087 modified "2023-10-15" @default.
• W2162772087 title "Comparative studies on trifluoroethanol (TFE) state of a thermophilic α-amylase and its mesophilic counterpart: limited proteolysis, conformational analysis, aggregation and reactivation of the enzymes" @default.
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• W2162772087 doi "https://doi.org/10.1016/j.ijbiomac.2004.03.006" @default.
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