Bulletin of the Korean Chemical Society

  • 제31권2호
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  • Pages.275-280
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  • 2010
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Biological Characterization of the Omp1-like Protein from Actinobacillus actinomycetemcomitans

  • Ha, Jung-Hye (Department of Molecular Biology, College of Natural Sciences, Pusan National University) ;
  • Jeong, Mi-Suk (Department of Molecular Biology, College of Natural Sciences, Pusan National University) ;
  • Jo, Wol-Soon (Medical Science Research Center, Dong-A University) ;
  • Jeong, Min-Ho (Medical Science Research Center, Dong-A University) ;
  • Jang, Se-Bok (Department of Molecular Biology, College of Natural Sciences, Pusan National University)
  • 발행 : 2010.02.20
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초록

Actinobacillus actinomycetemcomitans is a gram-negative, nonmotile coccobacillus bacterium that is associated with several human diseases, including endocarditis, meningitis, osteomyelitis, subcutaneous abscesses and periodontal diseases. A full-length Omp1-like protein gene from A. actinomycetemcomitans was cloned into a pQE30 vector and overexpressed in Escherichia coli BL21(DE3) cells. The protein revealed sequence homologies to Seventeen kilodalton proteins (Skp) from Pasteurella multocida and E. coli that have been characterized as periplasmic chaperones. This soluble Omp1-like protein was successfully purified to homogeneity for further folding and functional studies. The purity, identity, and conformation of the protein were determined using sodium dodecyl sulfate polyacrylamide gel electrophoresis, matrix-assisted laser desorption ionization mass spectrometry, circular dichroism, fluorescence spectroscopic, and differential scanning calorimetric studies. We showed that the protein formed an oligomer larger than a tetramer. We found, further, that it is comprised of mostly $\alpha$-helices and boasts high thermal stability.

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