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Appl. Environ. Microbiol., Jun 1997, 2189-2199, Vol 63, No. 6
BF Vogel, K Jorgensen, H Christensen, JE Olsen and L Gram
Seventy-six presumed Shewanella putrefaciens isolates from fish, oil
drillings, and clinical specimens, the type strain of Shewanella
putrefaciens (ATCC 8071), the type strain of Shewanella alga (IAM 14159),
and the type strain of Shewanella hanedai (ATCC 33224) were compared by
several typing methods. Numerical analysis of sodium dodecyl
sulfate-polyacrylamide gel electrophoresis of whole-cell protein and
ribotyping patterns showed that the strains were separated into two
distinct clusters with 56% +/- 10% and 40% +/- 14% similarity for
whole-cell protein profiling and ribotyping, respectively. One cluster
consisted of 26 isolates with 52 to 55 mol% G + C and included 15 human
isolates, mostly clinical specimens, 8 isolates from marine waters, and the
type strain of S. alga. This homogeneous cluster of mesophilic,
halotolerant strains was by all analyses identical to the recently defined
species S. alga (U. Simidu et al., Int. J. Syst. Bacteriol, 40:331-336,
1990). Fifty-two typically psychrotolerant strains formed the other, more
heterogeneous major cluster, with 43 to 47 mol% G + C. The type strain of
S. putrefaciens was included in this group. The two groups were confirmed
by 16S rRNA gene sequence analysis. It is concluded that the isolates must
be considered two different species, S. alga and S. putrefaciens, and that
most mesophilic isolates formerly identified as S. putrefaciens belong to
S. alga. The ecological role and potential pathogenicity of S. alga can be
evaluated only if the organism is correctly identified.
Copyright © 1997, American Society for Microbiology
Differentiation of Shewanella putrefaciens and Shewanella alga on the basis of whole-cell protein profiles, ribotyping, phenotypic characterization, and 16S rRNA gene sequence analysis
Danish Institute for Fisheries Research, Department of Seafood Research, Technical University of Denmark, Lyngby. bfv@ffl.min.dk
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