Abstract
Zymography is a widely used technique for the study of proteolytic activities on the basis of protein substrate degradation. In this study, substrate immersing zymography was used in analyzing proteolysis of extracellular proteases. Instead of being added directly into a sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS–PAGE) gel, the substrates were added into the immersing solution after electrophoresis. Substrate immersing zymography could accurately determine the molecular weight of trypsin, and band intensities were linearly related to the amount of protease. The diversity of extracellular proteases produced by different marine bacteria was analyzed by substrate immersing zymography, and large variations of proteolysis were evidenced. The proteolytic activity of Pseudoalteromonas strains was more complicated than that of other strains. Five Pseudoalteromonas strains and five Vibrio strains were further analyzed by substrate immersing zymography with different substrates (casein and gelatin), and multiple caseinolytic and gelatinolytic profiles were detected. The extracellular proteolytic profiles of Pseudoalteromonas strains exhibited a large intraspecific variation. Molecular weight (Mw) of the main protease secreted by Vibrio was 35 kDa. Additionally, the time-related change trends of the activities of extracellular proteases produced by Pseudoalteromonas sp. SJN2 were analyzed by substrate immersing zymography. These results implied the potential application of substrate immersing zymography for the analysis of the diversity of bacterial extracellular proteases.
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The work was supported by the National Natural Science Foundation of China (31070061, 31370104), Hunan Provincial Natural Science Foundation of China (13JJ9001), and National Sparking Plan Project (2013GA770009).
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Liu, D., Yang, X., Huang, J. et al. In situ Demonstration and Characteristic Analysis of the Protease Components from Marine Bacteria Using Substrate Immersing Zymography. Appl Biochem Biotechnol 175, 489–501 (2015). https://doi.org/10.1007/s12010-014-1287-2
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DOI: https://doi.org/10.1007/s12010-014-1287-2