Chemical analysis reveals regioisomeric macrocyclic tetraether mixtures in archaeal membrane lipids, demonstrating structural diversity in their glycerol backbone orientations.
Chemical degradation shows that an apparently homogeneous preparation from the lipids of Methanobacterium thermoautotrophicum is in fact a mixture of the regioisomeric compounds 2 and 8 differing in the relative orientation of their glycerol units; a similar situation holds for the related diglycerol tetraethers of Thermoplasma acidophilum and Sulfolobus solfataricus.
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Gräther et al. (1995) studied this question.
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