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Applied and Environmental Microbiology, February 2001, p. 553-560, Vol. 67, No. 2
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.2.553-560.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Riboprinting and 16S rRNA Gene Sequencing for Identification of Brewery Pediococcus Isolates

Michael Barney,* Antonia Volgyi,dagger Alfonso Navarro, and David Ryder

Miller Brewing Company, Milwaukee, Wisconsin 53201

Received 9 June 2000/Accepted 3 November 2000

A total of 46 brewery and 15 ATCC Pediococcus isolates were ribotyped using a Qualicon RiboPrinter. Of these, 41 isolates were identified as Pediococcus damnosus using EcoRI digestion. Three ATCC reference strains had patterns similar to each other and matched 17 of the brewery isolates. Six other brewing isolates were similar to ATCC 25249. The other 18 P. damnosus brewery isolates had unique patterns. Of the remaining brewing isolates, one was identified as P. parvulus, two were identified as P. acidilactici, and two were identified as unique Pediococcus species. The use of alternate restriction endonucleases indicated that PstI and PvuII could further differentiate some strains having identical EcoRI profiles. An acid-resistant P. damnosus isolate could be distinguished from non-acid-resistant varieties of the same species using PstI instead of EcoRI. 16S rRNA gene sequence analysis was compared to riboprinting for identifying pediococci. The complete 16S rRNA gene was PCR amplified and sequenced from seven brewery isolates and three ATCC references with distinctive riboprint patterns. The 16S rRNA gene sequences from six different brewery P. damnosus isolates were homologous with a high degree of similarity to the GenBank reference strain but were identical to each other and one ATCC strain with the exception of 1 bp in one strain. A slime-producing, beer spoilage isolate had 16S rRNA gene sequence homology to the P. acidilactici reference strain, in agreement with the riboprint data. Although 16S rRNA gene sequencing correctly identified the genus and species of the test Pediococcus isolates, riboprinting proved to be a better method for subspecies differentiation.

* Corresponding author. Mailing address: Miller Brewing Company, Technical Center, 3939 W. Highland Blvd., Milwaukee, WI 53201-0482. Phone: (414) 931-2293. Fax: (414) 931-2506. E-mail: mbarney{at}mbco.com.

dagger Present address: Department of Biology, N.U.I. Maynooth, County Kildare, Ireland.

Applied and Environmental Microbiology, February 2001, p. 553-560, Vol. 67, No. 2
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.2.553-560.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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