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Use of a simplified cell blot technique and 16S rRNA-directed probes for identification of common environmental isolates.

ABSTRACT: A simple technique in which rRNA-targeted oligodeoxynucleotide probes are used to identify bacteria immobilized on membranes is described. By using colony lifts, bacteria are directly transferred from plates to untreated nitrocellulose membranes. Alternatively, cells resuspended from colonies can be applied to membranes by using a vacuum manifold under high-salt conditions. Blotted cells are baked and hybridized under stringent conditions by using standard protocols. Treatment of blotted cells with sodium dodecyl sulfate, urea, formaldehyde, or protease had no apparent effect on hybridization signals. Hybridization to rRNA from cells that had been stored refrigerated for 6 days was readily detected; however, fivefold more cells (approximately 10(7) cells) were required to obtain hybridization signals comparable to those generated by cells not subjected to storage. The sequences of oligonucleotide probes specific for Pseudomonas cepacia, Comamonas testosteroni, and Acinetobacter calcoaceticus and a group probe identifying Pseudomonas aeruginosa, Pseudomonas mendocina, Pseudomonas fluorescens, Comamonas acidovorans, and "Flavobacterium" lutescens are presented. In conjunction with the colony lift hybridization procedure, bacteria isolated from river water were identified by using these probes.

SUBMITTER: Braun-Howland EB

PROVIDER: S-EPMC182440 | biostudies-other | 1993 Oct

REPOSITORIES: biostudies-other

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Use of a simplified cell blot technique and 16S rRNA-directed probes for identification of common environmental isolates.

Braun-Howland E B EB Vescio P A PA Nierzwicki-Bauer S A SA

Applied and environmental microbiology 19931001 10

A simple technique in which rRNA-targeted oligodeoxynucleotide probes are used to identify bacteria immobilized on membranes is described. By using colony lifts, bacteria are directly transferred from plates to untreated nitrocellulose membranes. Alternatively, cells resuspended from colonies can be applied to membranes by using a vacuum manifold under high-salt conditions. Blotted cells are baked and hybridized under stringent conditions by using standard protocols. Treatment of blotted cells w ...[more]

PMID: 7504429

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Project description:Laboratory-scale sequencing batch reactors (SBRs) as models for activated sludge processes were used to study enhanced biological phosphorus removal (EBPR) from wastewater. Enrichment for polyphosphate-accumulating organisms (PAOs) was achieved essentially by increasing the phosphorus concentration in the influent to the SBRs. Fluorescence in situ hybridization (FISH) using domain-, division-, and subdivision-level probes was used to assess the proportions of microorganisms in the sludges. The A sludge, a high-performance P-removing sludge containing 15.1% P in the biomass, was comprised of large clusters of polyphosphate-containing coccobacilli. By FISH, >80% of the A sludge bacteria were beta-2 Proteobacteria arranged in clusters of coccobacilli, strongly suggesting that this group contains a PAO responsible for EBPR. The second dominant group in the A sludge was the Actinobacteria. Clone libraries of PCR-amplified bacterial 16S rRNA genes from three high-performance P-removing sludges were prepared, and clones belonging to the beta-2 Proteobacteria were fully sequenced. A distinctive group of clones (sharing >/=98% sequence identity) related to Rhodocyclus spp. (94 to 97% identity) and Propionibacter pelophilus (95 to 96% identity) was identified as the most likely candidate PAOs. Three probes specific for the highly related candidate PAO group were designed from the sequence data. All three probes specifically bound to the morphologically distinctive clusters of PAOs in the A sludge, exactly coinciding with the beta-2 Proteobacteria probe. Sequential FISH and polyphosphate staining of EBPR sludges clearly demonstrated that PAO probe-binding cells contained polyphosphate. Subsequent PAO probe analyses of a number of sludges with various P removal capacities indicated a strong positive correlation between P removal from the wastewater as determined by sludge P content and number of PAO probe-binding cells. We conclude therefore that an important group of PAOs in EBPR sludges are bacteria closely related to Rhodocyclus and Propionibacter.

Dataset Information

Use of a simplified cell blot technique and 16S rRNA-directed probes for identification of common environmental isolates.

Publications

Use of a simplified cell blot technique and 16S rRNA-directed probes for identification of common environmental isolates.

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