Expression of two RpoH sigma factors in Sinorhizobium meliloti upon heat shock

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The plant symbiotic α-proteobacterium Sinorhizobium meliloti has two RpoH-type sigma factors, RpoH1 and RpoH2. The former induces the synthesis of heat shock proteins and optimizes interactions with the host. Using a Western blot analysis, we examined time course changes in the intracellular contents of these factors upon a temperature upshift. The RpoH1 level was relatively high and constant, suggesting that its regulatory role in the heat shock response is attained through the activation of the pre-existing RpoH1 protein. In contrast, the RpoH2 level was initially undetectable, and gradually increased. These differential patterns reflect the functional diversification of these factors.

Original languageEnglish
Pages (from-to)394-397
Number of pages4
JournalMicrobes and Environments
Issue number4
Publication statusPublished - 2017


  • Heat shock protein
  • Root-nodule symbiont
  • Sigma factor
  • Sinorhizobium meliloti
  • α-proteobacteria


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