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Related Experiment Videos

Tabtoxin-resistant protein: overexpression, purification, and characterization.

Jinyuan Liu1, Yi Le, Bin Ye

  • 1Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, P. R. China. liujy@mail.tsinghua.edu.cn

Protein Expression and Purification
|April 2, 2002
PubMed
Summary

Researchers characterized the purified tabtoxin-resistant protein (TTR) from Pseudomonas syringae pv. tabaci. This protein effectively detoxifies tabtoxinine-beta-lactam, confirming its role in bacterial self-protection against wildfire disease.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Plant Pathology

Background:

  • Pseudomonas syringae pv. tabaci causes tobacco wildfire disease.
  • The tabtoxin-resistance gene (ttr) is a proposed self-protection mechanism in this pathogen.

Purpose of the Study:

  • To express and purify the tabtoxin-resistant protein (TTR).
  • To characterize the biochemical and biophysical properties of TTR.
  • To confirm the detoxification activity of TTR.

Main Methods:

  • Gene cloning and expression in Escherichia coli.
  • Protein purification using affinity chromatography.
  • SDS-PAGE, mass spectrometry, isoelectric focusing, fluorescence spectroscopy, CD spectroscopy.
  • Spectrophotometric assay for detoxification activity.

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Main Results:

  • High-level expression and purification of recombinant TTR (approx. 21 kDa, pI 6.6).
  • Spectral analysis revealed characteristic fluorescence and CD spectra.
  • Demonstrated strong detoxification activity against tabtoxinine-beta-lactam.

Conclusions:

  • This study reports the first characterization of purified TTR.
  • TTR's detoxification capacity supports its role in Pseudomonas syringae pv. tabaci self-protection.
  • Provides insights into bacterial resistance mechanisms against phytotoxins.