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Isolation and chemical characterization of lipopolysaccharides from four Mycoplana species (M. bullata, M. segnis, M. ramosa and M. dimorpha)

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Abstract

Lipopolysaccharides (LPS), isolated from four Mycoplana species, i.e. the type strains of M. bullata, M. segnis, M. ramosa and M. dimorpha, were characterized onto their chemical composition and their respective lipid A-types. Those of M. bullata and M. segnis showed on DOC-PAGE an R-type character and had lipid A's of the Lipid ADAG-type which exclusively contained 2,3-diamino-2,3-dideoxy-d-glucose as lipid A sugar. LPS's of M. ramosa and M. dimorpha showed, although only weakly expressed, ladder-like patterns on DOC-PAGE indicating some S-type LPS's and lipid A of the d-glucosamine type (Lipid AGlcN). M. bullata LPS contained mannose and glucose in major amounts and additionally l-glycero-d-mannoheptose, whereas M. segnis LPS was composed of rhamnose, mannose and glucose together with both, d-glycero-d-manno- and l-glycero-d-manno-heptoses in a molar ratio of 1:2. All LPS's contained 2-keto-3-deoxy-octonic acid (Kdo), phosphate and an unidentified acidic component “X”. In addition to “X”, M. segnis LPS contained glucuronic and galacturonic acids, whereas M. ramosa LPS contained only galacturonic acid. Acetic acid hydrolysis of the LPS resulted in splitting off lipid A moieties, very rich in 3-hydroxy fatty acids, in particular in 3-OH-12:0 (in Lipid ADAG), or in 3-OH-14:0 (in Lipid AGlcN). Analysis of the 3-acyloxyacyl residues revealed major amounts of amide-linked 3-OH(3-OH-13:0)12:0 in lipid A of M. bullata and 3-OH(12:0)12:0 in lipid A of M. segnis. The rare 4-oxo-myristic acid (4-oxo-14:0) was observed only in M. bullata LPS, where it is ester-linked. Amide linked diesters could not be traced in M. ramosa and M. dimorpha. All four lipid A's lacked erster-bound acyloxyacyl residues.

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Abbreviations

DAG:

2,3-diamino-2,3-dideoxy-d-glucose

Kdo:

2-keto-3-deoxy-octonate

LPS:

lipopolysaccharide

PITC:

phenyl isothiocyanate

NANA:

N-acetyl neuraminic acid

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Author notes

  1. Rudrapatnam N. Tharanathan

    Present address: Department of Food Chemistry, Biochemistry Section, C.F.T.R.I., 570013, Mysore, India

Authors and Affiliations

  1. Max-Planck-Insitut für Immunbiologie, Stübeweg 51, W-7800, Freiburg i. Br., Germany

    Rudrapatnam N. Tharanathan, Heike Rau & Hubert Mayer

  2. Institute for Fermentation, 17-85, Juso-honmachi 2-chome, Yodogawa-ku, 532, Osaka, Japan

    Akira Yokota

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  1. Rudrapatnam N. Tharanathan
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  4. Hubert Mayer
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Tharanathan, R.N., Yokota, A., Rau, H. et al. Isolation and chemical characterization of lipopolysaccharides from four Mycoplana species (M. bullata, M. segnis, M. ramosa and M. dimorpha). Arch. Microbiol. 159, 445–452 (1993). https://doi.org/10.1007/BF00288592

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