Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 66, Issue 5, Pages 1796-1800Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.66.5.1796-1800.2000
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An in situ reverse transcription-PCR protocol for detecting specific mRNA in Methanosarcina mazei S-6 is described. This method allowed us to detect heat shock-induced increases in the intracellular levels of the transcript of the universal stress gene dnaK. The cell walls of paraformaldehyde-fixed cells were permeabilized by a thermal cycling procedure or by lysozyme treatment, and the cellular DNA was removed with DNase. The cells were subjected to a seminested reverse transcription-PCR protocol in which a digoxigenin-labeled primer was used. Detection of the reporter molecule was based on the 2-hydroxy-3-naphtoic acid-2'-phenylanilide phosphate-Fast Red detection system and binding of anti-digoxigenin-alkaline phosphatase conjugate, Fluorescence in permeabilized cells increased after a heat shock compared to fluorescence in non-heat-shocked cells, and the increase corresponded to an increase in the level of the dnaK transcript.
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