Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Expression and Biochemical Characterization of the Periplasmic Domain of Bacterial Outer Membrane Porin TdeA

  • Kim, Seul-Ki (College of Pharmacy and Research Institute for Drug Development, Pusan National University) ;
  • Yum, Soo-Hwan (College of Pharmacy and Research Institute for Drug Development, Pusan National University) ;
  • Jo, Wol-Soon (Donga-A University Medical Science Research Center) ;
  • Lee, Bok-Luel (College of Pharmacy and Research Institute for Drug Development, Pusan National University) ;
  • Jeong, Min-Ho (Donga-A University Medical Science Research Center) ;
  • Ha, Nam-Chul (College of Pharmacy and Research Institute for Drug Development, Pusan National University)
  • Published : 2008.05.31
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Abstract

TolC is an outer membrane porin protein and an essential component of drug efflux and type-I secretion systems in Gram-negative bacteria. TolC comprises a periplasmic $\alpha$-helical barrel domain and a membrane-embedded $\beta$-barrel domain. TdeA, a functional and structural homolog of TolC, is required for toxin and drug export in the pathogenic oral bacterium Actinobacillus actinomycetemcomitans. Here, we report the expression of the periplasmic domain of TdeA as a soluble protein by substitution of the membrane-embedded domain with short linkers, which enabled us to purify the protein in the absence of detergent. We confirmed the structural integrity of the TdeA periplasmic domain by size-exclusion chromatography, circular dichroism spectroscopy, and electron microscopy, which together showed that the periplasmic domain of the TolC protein family fold correctly on its own. We further demonstrated that the periplasmic domain of TdeA interacts with peptidoglycans of the bacterial cell wall, which supports the idea that completely folded TolC family proteins traverse the peptidoglycan layer to interact with inner membrane transporters.

Keywords

References

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