- International Journal of Systematic and Evolutionary Microbiology
- Volume 49, Issue 2
f Polyphasic taxonomy of the genus Shewanella and description of Shewanella oneidensis sp. nov.
- Authors: Kasthuri Venkateswaran†, Duane P. Moser, Michael E. Dollhopf, Douglas P. Lies, Daad A. Saffarini, Barbara J. MacGregor, David B. Ringelberg‡, David C. White, Miyuki Nishijima, Hiroshi Sano, Jutta Burghardt, Erko Stackebrandt, Kenneth H. Nealson§
- Author for correspondence: Kasthuri Venkateswaran. Tel: + 1 818 393 1481. Fax: + 1 818 393 4176. e-mail: email@example.com
- First Published Online: 01 April 1999, International Journal of Systematic and Evolutionary Microbiology 49: 705-724, doi: 10.1099/00207713-49-2-705
- Subject: New Taxa - Proteobacteria
- Issue Published:
The genus Shewanella has been studied since 1931 with regard to a variety of topics of relevance to both applied and environmental microbiology. Recent years have seen the introduction of a large number of new Shewanella-like isolates, necessitating a coordinated review of the genus. In this work, the phylogenetic relationships among known shewanellae were examined using a battery of morphological, physiological, molecular and chemotaxonomic characterizations. This polyphasic taxonomy takes into account all available phenotypic and genotypic data and integrates them into a consensus classification. Based on information generated from this study and obtained from the literature, a scheme for the identification of Shewanella species has been compiled. Key phenotypic characteristics were sulfur reduction and halophilicity. Fatty acid and quinone profiling were used to impart an additional layer of information. Molecular characterizations employing small-subunit 16S rDNA sequences were at the limits of resolution for the differentiation of species in some cases. As a result, DNA-DNA hybridization and sequence analyses of a more rapidly evolving molecule (gyrB gene) were performed. Species-specific PCR probes were designed for the gyrB gene and used for the rapid screening of closely related strains. With this polyphasic approach, in addition to the ten described Shewanella species, two new species, Shewanella oneidensis and ‘Shewanella pealeana’, were recognized; Shewanella oneidensis sp. nov. is described here for the first time.
The GenBank accession numbers for the sequences reported in this paper are given in Table 1.
Present address: Geology of Planetary Sciences, California Institute of Technology, Mail Code 170-25,1201 E. California Blvd, Pasadena, CA91125, USA.
Present address: Dyntel Corp., Waterways Experiment Station, Vicksburg, MS 39180-6199, USA.
Present address: Environmental Engineering Sciences, California Institute of Technology, Mail Code 138-78, 1201 E. California Blvd, Pasadena, CA 91125, USA.
- Keyword(s): Shewanella, shewanella oneidensis sp. nov. MR-1, polyphasic taxonomy, gyrase B, 16S rDNA
© 1999, International Union of Microbiological Societies | Published by the Microbiology Society
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