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

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    2 Citations (Scopus)


    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

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Soil Science
    • Plant Science


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