The detailed conformational analysis of a single molecule of the tetraacyl biosynthetic precursor-type lipid A and its characteristic supramolecular assembly in aqueous SDS-micelles are described. Regular molecular arrangements were observed by detailed analysis of the NMR spectra of synthetically pure specimens, including regiospecifically 13C-labeled ones. NMR analysis of a biologically inactive precursor-type analogue with four shorter acyl chains demonstrated its conformational flexibility, indicating the importance of hydrophobic interactions for maintaining the conformation of such molecules.
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Oikawa et al. (2004) studied this question.
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