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      https://www.ias.ac.in/article/fulltext/jbsc/029/02/0153-0161

    • Keywords

       

      Anabaena ; Escherichia coli ; potassium regulation; stress proteins

    • Abstract

       

      Potassium deficiency enhanced the synthesis of fifteen proteins in the nitrogen-fixing cyanobacteriumAnabaena torulosa and of nine proteins inEscherichia coli. These were termed potassium deficiency-induced proteins or PDPs and constitute hitherto unknown potassium deficiency-induced stimulons. Potassium deficiency also enhanced the synthesis of certain osmotic stress-induced proteins. Addition of K+ repressed the synthesis of a majority of the osmotic stress-induced proteins and of PDPs in these bacteria. These proteins contrast with the dinitrogenase reductase ofA. torulosa and the glycine betaine-binding protein ofE. coli, both of which were osmo-induced to a higher level in potassium-supplemented conditions. The data demonstrate the occurrence of novel potassium deficiency-induced stimulons and a wider role of K+ in regulation of gene expression and stress responses in bacteria.

    • Author Affiliations

       

      Anuradha Alahari1 Shree Kumar Apte1

      1. Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, India
    • Dates

       
  • Journal of Biosciences | News

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