Chemical composition of the lipopolysaccharides of Rhodobacter sulfidophilus,Rhodopseudomonas acidophila,and Rhodopseudomonas blastica |
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Authors: | B Tegtmeyer J Weckesser H Mayer J F Imhoff |
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Institution: | (1) Institut für Biologie II, Mikrobiologie, der Albert-Ludwigs-Universität, Schänzlestr. 1, D-7800 Freiburg i. Br., Federal Republic of Germany;(2) Max-Planck-Institut für Immunbiologie, Stübeweg 51, D-7800 Freiburg i. Br., Federal Republic of Germany;(3) Institut für Mikrobiologie, Meckenheimer Allee 168, D-5300 Bonn 1, Federal Republic of Germany |
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Abstract: | The lipopolysaccharides of Rhodobacter sulfidophilus and the two budding species Rhodopseudomonas acidophila and Rhodopseudomonas blastica were isolated and chemically analyzed. The all have a lipid A backbone structure with glucosamine as the only amino sugar. The lipid A's of Rb. sulfidophilus and Rps. blastica contain phosphate, their fatty acids are characterized by ester-linked, unsubstituted 3-OH-10:0 and amide-linked 3-OH-14:0 (Rb. sulfidophilus) or 3-oxo-14:0 (Rps. blastica). Lipid A of Rps. acidophila is free of phosphate and contains the rare 3-OH-16:0 fatty acid in amide linkage.The lipopolysaccharides of all three species contain 2-keto-3-deoxy-octonate (KDO) but are devoid of heptoses. Neutral sugars with the exception of glucose are lacking in the lipopolysaccharide of Rb. sulfidophilus. This shows a high galacturonic acid content. The lipopolysaccharides of Rps. acidophila and Rps. blastica have neutral sugar spectra indicative for typical O-chains (rhamnose, mannose, galactose, glucose in both species, and in Rps. blastica additionally 2-O-methyl-6-deoxy-hexose). The taxonomic value of the data is discussed.This paper is dedicated to Prof. Dr. Norbert Pfennig on the occasion of his 60th birthday |
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Keywords: | Lipopolysaccharide Lipid A Rhodobacter sulfidophilus Rhodopseudomonas acidophila Rhodopseudomonas blastica Phototrophic bacteria |
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