Microbial detection with low molecular weight RNA

Katerina D. Kourentzi, George E. Fox, Richard C. Willson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The need to monitor microorganisms in the environment has increased interest in assays based on hybridization probes that target nucleic acids (e.g., rRNA). We report the development of liquid-phase assays for specific bacterial 5S rRNA sequences or similarly sized artificial RNAs (aRNAs) using molecular beacon technology. These beacons fluoresce only in the presence of specific target sequences, rendering as much as a 27-fold fluorescence enhancement. The assays can be used with both crude cell lysates and purified total RNA preparations. Minimal sample preparation (e.g., heating to promote leakage from cells) is sufficient to detect many Gram-negative bacteria. Using this approach it was possible to detect an aRNA-labeled Escherichia coli strain in the presence of a large background of an otherwise identical E. coli strain. Finally, by using a longer wavelength carboxytetramethylrhodamine beacon it was possible to reduce the fraction of the signal due to cellular autofluorescence to below 0.5%.

Original languageEnglish (US)
Pages (from-to)444-447
Number of pages4
JournalCurrent Microbiology
Issue number6
StatePublished - Dec 13 2001

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology


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