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Preliminary study on total protein extraction methods from Enterococcus faecalis biofilm.

W Chen1, J Liang2, Z He3

  • 1Department of Stomatology, Eye & ENT Hospital of FuDan University, Shanghai, China.

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|October 6, 2016
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Summary

This study optimized ultrasonication for extracting total proteins from Enterococcus faecalis biofilms. The Bradford assay proved most effective for quantifying these bacterial proteins.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Enterococcus faecalis is a primary pathogen in endodontic diseases and refractory periapical periodontitis.
  • Bacterial biofilms, particularly those formed by E. faecalis, are strongly linked to virulence due to high total protein expression.

Purpose of the Study:

  • To optimize ultrasonication parameters for efficient total protein extraction from E. faecalis biofilms.
  • To compare the efficacy of Bicinchoninic acid, Bradford Coomassie brilliant blue, and Lowry assays for quantifying extracted biofilm proteins.

Main Methods:

  • Utilized ultrasonication with varied parameters (duration, amplitude, period, duty cycle) for protein extraction from E. faecalis biofilms.
  • Analyzed protein profiles using SDS-PAGE to determine optimal ultrasonication conditions.
  • Quantified total protein content using Bicinchoninic acid, Bradford Coomassie brilliant blue, and Lowry assays.

Main Results:

  • Optimal ultrasonication conditions were determined as 2 min duration, 20% amplitude, 4s period, and 50% duty cycle.
  • Protein quantification yielded 2299.1 mg/dish (Bicinchoninic acid), 3793.8 mg/dish (Bradford), and 1858.0 mg/dish (Lowry).
  • The Bradford Coomassie brilliant blue assay demonstrated the highest protein yield.

Conclusions:

  • The optimized ultrasonication method effectively extracts total proteins from E. faecalis biofilms.
  • The Bradford Coomassie brilliant blue assay is a simple, feasible, and effective method for quantifying total protein content in bacterial biofilms.