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Transcriptomic analysis reveals how a lack of potassium ions increases Sulfolobus acidocaldarius sensitivity to pH changes
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics. Stockholm University, Science for Life Laboratory (SciLifeLab).
Number of Authors: 4
2016 (English)In: Microbiology, ISSN 1350-0872, E-ISSN 1465-2080, Vol. 162, no 8, 1422-1434 p.Article in journal (Refereed) Published
Abstract [en]

Extremely acidophilic microorganisms (optimum growth pH of <= 3) maintain a near neutral cytoplasmic pH via several homeostatic mechanisms, including an inside positive membrane potential created by potassium ions. Transcriptomic responses to pH stress in the thermoacidophilic archaeon, Sulfolobus acidocaldarius were investigated by growing cells without added sodium and/or potassium ions at both optimal and sub-optimal pH. Culturing the cells in the absence of added sodium or potassium ions resulted in a reduced growth rate compared to full-salt conditions as well as 43 and 75 significantly different RNA transcript ratios, respectively. Differentially expressed RNA transcripts during growth in the absence of added sodium ions included genes coding for permeases, a sodium/proline transporter and electron transport proteins. In contrast, culturing without added potassium ions resulted in higher RNA transcripts for similar genes as a lack of sodium ions plus genes related to spermidine that has a general role in response to stress and a decarboxylase that potentially consumes protons. The greatest RNA transcript response occurred when S. acidocaldarius cells were grown in the absence of potassium and/or sodium at a sub-optimal pH. These adaptations included those listed above plus osmoregulated glucans and mechanosensitive channels that have previously been shown to respond to osmotic stress. In addition, data analyses revealed two co-expressed IcIR family transcriptional regulator genes with a previously unknown role in the S. acidocaldarius pH stress response. Our study provides additional evidence towards the importance of potassium in acidophile growth at acidic pH.

Place, publisher, year, edition, pages
2016. Vol. 162, no 8, 1422-1434 p.
National Category
Microbiology
Identifiers
URN: urn:nbn:se:su:diva-135984DOI: 10.1099/mic.0.000314ISI: 000385271900015OAI: oai:DiVA.org:su-135984DiVA: diva2:1050338
Available from: 2016-11-28 Created: 2016-11-28 Last updated: 2016-12-12Bibliographically approved

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CiteExportLink to record
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