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- W1973761444 abstract "A halophilic isolate Salimicrobium halophilum strain LY20 producing extracellular amylase and protease was isolated from Yuncheng, China. Production of both enzymes was synchronized with bacterial growth and reached a maximum level during the early-stationary phase. The amylase and protease were purified to homogeneity with molecular weights of 81 and 30 kDa, respectively. Optimal amylase activity was observed at 70 °C, pH 10.0% and 10% NaCl. Complete inhibition by EDTA, diethyl pyrocarbonate (DEPC), and phenylarsine oxide (PAO) indicated that the amylase was a metalloenzyme with histidine and cysteine residues essential for its catalysis. Maltose was the main product of starch hydrolysis, indicating an β-amylase activity. The purified protease from LY20 showed highest activity at 80 °C, pH 10.0% and 12.5% NaCl. Complete inhibition was shown by phenylmethylsulfonyl fluoride, DEPC, and PAO, indicating that the enzyme probably belonged to the subclass of the serine proteases with histidine and cysteine residues essential for catalysis. Furthermore, both enzymes were highly stable over broad temperature (30–80 °C), pH (6.0–12.0) and NaCl concentration (2.5–20%) ranges, showing excellent thermostable, alkalistable, and halotolerant nature. The surfactants (SDS, Tween 80, and Triton X-100) did not affect their activities. In addition, both enzymes from LY20 displayed remarkable stability in the presence of water-soluble organic solvents with log Pow ≤ −0.24." @default.
- W1973761444 created "2016-06-24" @default.
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- W1973761444 date "2012-02-28" @default.
- W1973761444 modified "2023-10-18" @default.
- W1973761444 title "Purification and characterization of novel organic-solvent-tolerant β-amylase and serine protease from a newly isolated Salimicrobium halophilum strain LY20" @default.
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- W1973761444 doi "https://doi.org/10.1111/j.1574-6968.2012.02522.x" @default.
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