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Cloning and Molecular Characterization of groESL Heat-Shock Operon in Methylotrophic Bacterium Methylovorus Sp. Strain SS1 DSM 11726

  • Eom, Chi-Yong (Department of Biology, Yonsei University) ;
  • Kim, Eung-Bin (Department of Biology, Yonsei University) ;
  • Ro, Young-Tae (Laboratory of Biochemistry, College of Medicine, Konkuk University) ;
  • Kim, Si-Wouk (Department of Environmental Engineering, Chosun University) ;
  • Kim, Young-Min (Department of Biology, Yonsei University)
  • Published : 2005.11.30

Abstract

The groESL bicistronic operon of a restricted facultative methylotrophic bacterium Methylovorus sp. strain SS1 DSM 11726 was cloned and characterized. It was found to consist of two ORFs encoding proteins with molecular masses of 11,395 and 57,396 daltons, which showed a high degree of homology to other bacterial GroES and GroEL proteins. The genes were clustered in the transcription order groES-groEL. Northern blot analyses suggested that the groESL operon is transcribed as a bicistronic 2.2-kb mRNA, the steady-state level of which was markedly increased by temperature elevation. Primer extension analysis demonstrated one potential transcription start site preceding the groESL operon, which is located 100bp upstream of the groES start codon. The transcription start site was preceded by a putative promoter region highly homologous to the consensus sequences of Escherichia coli ${\sigma}^{32}$-type heat shock promoter, which functioned under both normal and heat shock conditions in E. coli. Heat shock mRNA was maximally produced by Methylovorus sp. strain SS1 approximately 10min after increasing the temperature from 30 to $42^{\circ}C$. The groESL operon was also induced by hydrogen peroxide or salt shock.

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