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Detection of Protease Activity by Fluorescent Peptide Zymography
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Amylase Zymography.

Adarelys Andrades1,2, Lellys M Contreras3

  • 1University of Leipzig, Leipzig, Germany. adarelys.andrades@outlook.com.

Methods in Molecular Biology (Clifton, N.J.)
|June 14, 2017
PubMed
Summary
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This study detected extracellular amylases from Geobacillus stearothermophilus using amylase zymography. These thermophilic enzymes exhibit optimal activity at 60°C and pH 6.0.

Area of Science:

  • Microbiology
  • Enzymology
  • Biochemistry

Background:

  • Geobacillus stearothermophilus is a thermophilic bacterium found in geothermal environments.
  • Amylases are enzymes that break down starch, with applications in various industries.
  • Zymography is a sensitive technique for detecting enzyme activity directly after electrophoresis.

Purpose of the Study:

  • To detect and characterize amylases produced by a Geobacillus stearothermophilus strain.
  • To investigate the enzymatic properties, including optimal temperature and pH.
  • To partially purify and determine the molecular masses of the secreted amylases.

Main Methods:

  • Isolation and cultivation of Geobacillus stearothermophilus from a Venezuelan thermal spring.
  • Amylase zymography using starch-containing gels and iodine staining.
Keywords:
AmylasesGel electrophoresisGeobacillus stearothermophilusHydrolasesThermophilesZymography

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  • Partial purification via cold acetone precipitation and chromatography.
  • Molecular mass determination using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE).

    • Main Results:

    • Extracellular amylases were successfully detected in the culture medium of G. stearothermophilus.
    • The secreted amylolytic enzymes showed optimal activity at 60°C and pH 6.0.
    • Purified amylases exhibited distinct molecular masses, confirmed by zymography and SDS-PAGE.

    Conclusions:

    • Geobacillus stearothermophilus produces multiple extracellular amylases with potential industrial applications.
    • Zymography is an effective method for visualizing amylase activity from thermophilic bacteria.
    • The characterized amylases possess properties suitable for biotechnological use at elevated temperatures.