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Int J Syst Bacteriol 42 (1992), 542-546; DOI 10.1099/00207713-42-4-542
© 1992 Society for General Microbiology
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Biochemical and Chemical Studies on Strains Designated Prevotella intermedia and Proposal of a New Pigmented Species, Prevotella nigrescens sp. nov.

Haroun N. Shah1,2,* and Saheer E. Gharbia1

1Department of Oral Biology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5
2Faculty of Dentistry, and Department of Microbiology and Immunology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5

* Corresponding author.

ABSTRACT

A total of 31 strains of Prevotella intermedia were subjected to DNA-DNA hybridization and were characterized by performing physiological tests and by performing a multilocus enzyme analysis, using malate dehydrogenase and glutamate dehydrogenase. All of the strains assigned to P. intermedia fermented glucose and sucrose, hydrolyzed starch but not esculin, and produced indole, acetic, isobutyric, isovaleric, and succinic acids as metabolic end products. The results of DNA reassociation experiments performed with the reference probe permitted separation of the strains into two well-defined homology groups. In addition, strains with DNAs that hybridized with DNA from strain ATCC 25611T (T = type strain) had high levels of peptidase activity and cleaved lipid substrates (4-methylumbelliferyl laurate and 4-methylumbellifelyl elaidate). Multilocus enzyme electrophoresis revealed two electromorphic profiles, one characteristic of strain ATCC 25611T and the other characteristic of strain ATCC 33563T. We propose that a new species, Prevotella nigrescens, should be created for the genetically distinct group of strains that hybridized with strain ATCC 33563T. Strain ATCC 33563 is designated the type strain of P. nigrescens.




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