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Micromethods for Lipid A Isolation and Structural Characterization

 Last Update: 2021-02-19
 Source: Internet
 Author: User

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rapid release therapy

aeruginosa

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Lipopolysaccharides (LPSs) are major components of the external membrane of Gram-negative bacteria, and act as an effective permeability barrier. They are essentially composed of a hydrophilic polysaccharide region linked to an hydrophobic one, termed lipid A. Depending on their individual variable fine structures, they may be potent immunomodulators. Because of the structural importance and role of lipid A in bacterial pathogenesis, herein we describe two rapid practical micromethods for structural analysis. The first method allows the direct isolation of lipid A from whole bacteria cell mass; the second describes conditions for the sequential release of fatty acids, enabling the determination of their substitution position in the lipid A structure to be determined by matrix-assisted laser desorption/ionization mass spectrometry. Examples are given with reference to two major pathogens:
Bordetella pertussis
and
Pseudomonas aeruginosa
.

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