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- W1979786089 abstract "A gene encoding acidic, thermostable and raw starch hydrolysing α-amylase was cloned from an extreme thermophile Geobacillus thermoleovorans and expressed. The ORF of 1650 bp encodes a 515 amino acid protein (Gt-amy) with a signal peptide of 34 amino acids at the N-terminus. Seven conserved sequences of GH-13 family have been found in its sequence. The specific enzyme activity of recombinant Gt-amy is 1723 U mg−1 protein with a molecular mass of 59 kDa. It is optimally active at pH 5.0 and 80 °C with t1/2 values of 283, 184 and 56 min at 70, 80 and 90 °C, respectively. The activation energy required for its temperature deactivation is 84.96 kJ mol−1. Ca2+ strongly inhibits Gt-amy at 10 mM concentration, and inhibition kinetics with Ca2+ reveals that inhibition occurs as a result of binding to a lower affinity secondary Ca2+ binding site in the active centre in a mixed-type inhibition manner. The Km and kcat of the Gt-amy are 0.315 mg mL−1 and 2.62 × 103 s−1, respectively. Gt-amy is Ca2+-independent at the concentration used in industrial starch saccharification, and hydrolyses raw corn and wheat starches efficiently, and thus, is applicable in starch saccharification at the industrial sub-gelatinization temperatures." @default.
- W1979786089 created "2016-06-24" @default.
- W1979786089 creator A5034287045 @default.
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- W1979786089 date "2013-01-01" @default.
- W1979786089 modified "2023-10-16" @default.
- W1979786089 title "Biochemical and molecular characterization of recombinant acidic and thermostable raw-starch hydrolysing α-amylase from an extreme thermophile Geobacillus thermoleovorans" @default.
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- W1979786089 doi "https://doi.org/10.1016/j.molcatb.2012.08.017" @default.
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