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2000
Volume 19, Issue 3
  • ISSN: 1570-1646
  • E-ISSN: 1875-6247

Abstract

Background: Amylase used in the market is mostly medium-temperature enzyme or high-temperature enzyme and has poor enzyme activity under low-temperature environment. Acid α-amylase can be used to develop digestion additives in the pharmaceutical and healthcare industries. The amino acid sequence and structural differences among α-amylases obtained from various organisms are high enough to confer interesting biochemical diversity to the enzymes. However, low- temperature (0-50°C) amylase, with an optimum temperature and heat sensitivity, has a greater potential value than medium (50-80°C) and high (80-110°C) temperature amylases. Methodology: The gene amy48 from encoding extracellular α-amylase in Bacillus subtilis YX48 was successfully cloned into the pET30a (+) vector and expressed in Escherichia coli BL21 (DE3) for biochemical characterization. Results and Conclusion: The molecular weight of α-amylase was 75 kDa. The activity of α-amylase was not affected by Ca2+, and Amy48 had the best activity at pH 5.0 and 37°C. AMY48 has high stability over a narrow pH and temperature range (5.0-8.0 and 30-45°C). Amylase activity was strongly inhibited by Zn2+, Mn2+, Cu2+, and Fe2+ ions, but Na+, K+, and Co2+ ions stimulate its activity slightly. The purified enzyme showed gradually reduced activity in the presence of detergents. However, it was remarkably stable against EDTA and urea.

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/content/journals/cp/10.2174/1570164618666210726161428
2022-06-01
2024-12-12
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  • Article Type:
    Research Article
Keyword(s): Bacillus subtilis; characterization; organic; solvents; YX48; α-amylase
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