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A novel potassium deficiency-induced stimulon inAnabaena torulosa

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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.

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Abbreviations

GBBP:

Glycine betaine-binding protein

ISPs:

ionic stress-induced proteins

KdpATPase:

K+-dependent AT-Pase

OSPs:

osmotic stress-induced proteins

PDI:

potassium deficiency-induced

PDPs:

potassium deficiency-induced proteins

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

    Anuradha Alahari & Shree Kumar Apte

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  1. Anuradha Alahari
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  2. Shree Kumar Apte
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Correspondence to Shree Kumar Apte.

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Alahari, A., Apte, S.K. A novel potassium deficiency-induced stimulon inAnabaena torulosa . J. Biosci. 29, 153–161 (2004). https://doi.org/10.1007/BF02703413

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  • DOI: https://doi.org/10.1007/BF02703413

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