PMID- 12732564 OWN - NLM STAT- MEDLINE DCOM- 20030805 LR - 20210526 IS - 0099-2240 (Print) IS - 1098-5336 (Electronic) IS - 0099-2240 (Linking) VI - 69 IP - 5 DP - 2003 May TI - In situ accessibility of Saccharomyces cerevisiae 26S rRNA to Cy3-labeled oligonucleotide probes comprising the D1 and D2 domains. PG - 2899-905 AB - Fluorescence in situ hybridization (FISH) has proven to be most useful for the identification of microorganisms. However, species-specific oligonucleotide probes often fail to give satisfactory results. Among the causes leading to low hybridization signals is the reduced accessibility of the targeted rRNA site to the oligonucleotide, mainly for structural reasons. In this study we used flow cytometry to determine whole-cell fluorescence intensities with a set of 32 Cy3-labeled oligonucleotide probes covering the full length of the D1 and D2 domains in the 26S rRNA of Saccharomyces cerevisiae PYCC 4455(T). The brightest signal was obtained with a probe complementary to positions 223 to 240. Almost half of the probes conferred a fluorescence intensity above 60% of the maximum, whereas only one probe could hardly detect the cells. The accessibility map based on the results obtained can be extrapolated to other yeasts, as shown experimentally with 27 additional species (14 ascomycetes and 13 basidiomycetes). This work contributes to a more rational design of species-specific probes for yeast identification and monitoring. FAU - Inacio, Joao AU - Inacio J AD - Centro de Recursos Microbiologicos, Biotechnology Unit, Faculty of Sciences and Technology, New University of Lisbon, 2829-516 Caparica, Portugal. FAU - Behrens, Sebastian AU - Behrens S FAU - Fuchs, Bernhard M AU - Fuchs BM FAU - Fonseca, Alvaro AU - Fonseca A FAU - Spencer-Martins, Isabel AU - Spencer-Martins I FAU - Amann, Rudolf AU - Amann R LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Appl Environ Microbiol JT - Applied and environmental microbiology JID - 7605801 RN - 0 (Carbocyanines) RN - 0 (Fluorescent Dyes) RN - 0 (Oligonucleotide Probes) RN - 0 (RNA, Fungal) RN - 0 (RNA, Ribosomal) RN - 0 (RNA, ribosomal, 26S) RN - 0 (cyanine dye 3) SB - IM MH - Base Sequence MH - Carbocyanines MH - Flow Cytometry MH - Fluorescent Dyes MH - In Situ Hybridization, Fluorescence MH - Nucleic Acid Conformation MH - Oligonucleotide Probes/chemistry/*genetics MH - RNA, Fungal/chemistry/*genetics MH - RNA, Ribosomal/chemistry/*genetics MH - Saccharomyces cerevisiae/*genetics MH - Species Specificity PMC - PMC154520 EDAT- 2003/05/07 05:00 MHDA- 2003/08/06 05:00 PMCR- 2003/05/01 CRDT- 2003/05/07 05:00 PHST- 2003/05/07 05:00 [pubmed] PHST- 2003/08/06 05:00 [medline] PHST- 2003/05/07 05:00 [entrez] PHST- 2003/05/01 00:00 [pmc-release] AID - 1738 [pii] AID - 10.1128/AEM.69.5.2899-2905.2003 [doi] PST - ppublish SO - Appl Environ Microbiol. 2003 May;69(5):2899-905. doi: 10.1128/AEM.69.5.2899-2905.2003.