| Autor: |
Knudsen, Egil, Jantzen, Erik, Bryn, Klaus, Ormerod, John, Sirevåg, Reidun |
| Zdroj: |
Archives of Microbiology; Aug1982, Vol. 132 Issue 2, p149-154, 6p |
| Abstrakt: |
The lipid compositions of Chlorobium limicola (4 strains) and Chloroflexus aurantiacus (2 strains) have been compared. Both species contained straight-chain, saturated and monosaturated fatty acids as their main fatty acid constituents but the patterns were distinctly different. Chlorobium contained acids of chain-length essentally in the range C−C with n-tetradecanoate, hexadecenoate and n-hexadecanoate predominating. Chloroflexus was characterized by the presence of significant amounts of C and C−C fatty acids not detected in Chlorobium. The latter, on the other hand, contained hydroxylated and cyclopropane-substituted acids not detected in Chloroflexus. Simple wax esters (C−C) were found solely in Chloroflexus and accounted for 2.5-3.0% of the cell dry weight. Their fatty acid constituents ranged from C−C (both saturated and monounsaturated isomers) whereas the alcohols were generally saturated and of chain-length C−C. Waxes in the range C−C accounted for more than 60% of the total. The polar lipid patterns of the two genera also showed marked differences. All strains contained phosphatidyl-glycerol, monogalactosyl diglyceride and sulfoquinovosyldiglyceride. Chlorobium contained in addition cardiolipin, phosphatidylethanolamine, the unidentified 'glycolipid II' and several other unidentified glycolipids, whereas phosphatidyl inositol and a diglycosyl diglyceride were specific for Chloroflexus. The latter lipid contained equimolar amounts of glucose and galactose. Phenol-water extraction yielded material comprising 14% of the dry cell weight for Chlorobium but only 2.5% for Chloroflexus. The Chlorobium material contained two 3-hydroxy fatty acids and several uncommon sugars (not identified). The analytical results were inconclusive regarding occurrence of 2-keto-3-deoxyoctonate. No typical lipopoly-saccharide constituents were found in Chloroflexus. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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