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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Proteomic analysis of heat-stable proteins in Escherichia coli

  • Kwon, Soon-Bok (Department of Bioinformatics and Life Science, Soongsil University) ;
  • Jung, Yun-A (Department of Bioinformatics and Life Science, Soongsil University) ;
  • Lim, Dong-Bin (Department of Bioinformatics and Life Science, Soongsil University)
  • Received : 2007.09.23
  • Accepted : 2007.12.06
  • Published : 2008.02.29
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Abstract

Some proteins of E. coli are stable at temperatures significantly higher than $49^{\circ}C$, the maximum temperature at which the organism can grow. The heat stability of such proteins would be a property which is inherent to their structures, or it might be acquired by evolution for their specialized functions. In this study, we describe the identification of 17 heat-stable proteins from E. coli. Approximately one-third of these proteins were recognized as having functions in the protection of other proteins against denaturation. These included chaperonin (GroEL and GroES), molecular chaperones (DnaK and FkpA) and peptidyl prolyl isomerases (trigger factor and FkpA). Another common feature was that five of these proteins (GroEL, GroES, Ahpc, RibH and ferritin) have been shown to form a macromolecular structure. These results indicated that the heat stability of certain proteins may have evolved for their specialized functions, allowing them to cope with harsh environments, including high temperatures.

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