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Chemical Characterization Of The Ester-linked 3-hydroxy Fatty Acyl-containing Lipids In Mycobacterium Tuberculosis.

S. Alugupalli, M. Lanéelle, L. Larsson, M. Daffé
Published 1995 · Biology, Medicine

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In a previous study (S. Alugupalli, F. Portaels, and L. Larsson, J. Bacteriol. 176:2962-2969, 1994), we reported the occurrence of 21 3-hydroxy fatty acids (3-OH-FAs) in the methanolysis products of different mycobacterial species. The present study was undertaken in order to chemically characterize the ester-linked complex native forms of these acids in Mycobacterium tuberculosis. Three 3-OH-FA-containing lipids were purified by chromatography and analyzed by one- and two-dimensional nuclear magnetic resonance spectroscopy, by fast atom bombardment-mass spectrometry, and by various conventional chemical analysis techniques. 3-OH-2,4,6-trimethyl-FAs were found in 2,3-diacyl trehalose and 2,3,6,6'-tetra-acyl-2'-sulfate trehalose (sulfatide I), two specific glycolipids of the tubercle bacillus, explaining the specific occurrence of these fatty acids in the methanolysis products of virulent strains of M. tuberculosis. Straight-chain 3-OH-FAs were localized in phosphatidyl ethanolamine but not in the other phospholipids, suggesting a possible role of this class of phospholipids in the metabolism of fatty acids in actinomycetes.
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