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Int J Syst Evol Microbiol 55 (2005), 1545-1549; DOI  10.1099/ijs.0.63627-0
© 2005 International Union of Microbiological Societies

Saccharophagus degradans gen. nov., sp. nov., a versatile marine degrader of complex polysaccharides

Nathan A. Ekborg1, Jose M. Gonzalez2, Michael B. Howard1, Larry E. Taylor3, Steven W. Hutcheson1 and Ronald M. Weiner1

1 Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD 20742, USA
2 Department of Microbiology and Cell Biology, University of La Laguna, 38206 La Laguna, Tenerife, Spain
3 Department of Marine Estuarine Environmental Sciences, College Park, MD 20742, USA

Correspondence
Ronald M. Weiner
rw19{at}umail.umd.edu

Gammaproteobacteria belonging and related to the genus Microbulbifer are an emerging group of complex carbohydrate-degrading marine bacteria. Previously, all of the representatives were placed within Microbulbifer or were unclassified. Recently, a new genus, Teredinibacter, represented by a single species, Teredinibacter turnerae, was formed to include an endosymbiotic branch of these organisms. In this study, based on 16S rRNA gene sequence similarity and phenotypic analyses, a new genus, Saccharophagus, is proposed to accommodate the most versatile marine carbohydrate degrader yet identified, Saccharophagus degradans gen. nov., sp. nov. 2-40T (=ATCC 43961T=DSM 17024T). S. degradans strain 2-40T can degrade 10 tested complex polysaccharides: agar, alginate, chitin, cellulose, fucoidan, laminarin, pectin, pullulan, starch and xylan. S. degradans 2-40T shares 90·5 % 16S rRNA gene sequence similarity with the type strain of the Microbulbifer type species, Microbulbifer hydrolyticus IRE-31T, and 91·5 % with T. turnerae T7902T, and can be further distinguished from members of these two genera by 16S rRNA gene cluster analysis, the ability to utilize 10 different complex polysaccharides as sole carbon sources, a significantly lower G+C content and differences in fatty acid content. The three genera of complex polysaccharide-degrading, marine bacteria now encompass 20 strains from diverse marine niches.

Abbreviations: CP, complex polysaccharide

Published online ahead of print on 4 March 2005 as DOI 10.1099/ijs.0.63627-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 2-40T is AF055269.




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