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Microbe-Plant Interactions

Bacteriohopanetetrol: Abundant Lipid in Frankia Cells and in Nitrogen-Fixing Nodule Tissue ¹

Department of Environmental Horticulture, University of California, Davis, California 95616, Facility for Advanced Instrumentation, University of California, Davis, California 95616, U.S. Department of Agriculture-Agricultural Research Service, Eastern Regional Research Center, Philadelphia, Pennsylvania 19118

An unusual class of lipid with amphiphilic properties has been detected in nodule tissue of Alnus and Ceanothus. High levels of the same lipid (20-50% of total cell lipids) were detected in solvent extracts of Frankia spp. cells. However, the lipid was absent in host roots. The lipid was purified and quantified by high-performance liquid chromatography/flame ionization detector. Phenol-sulfuric acid determinations and proton nuclear magnetic resonance indicated that the purified lipid is not a glycolipid. Mass spectra of the predominant species are consistent with published spectra for bacteriohopanetetrol (C₃₅H₆₂O₄), a pentacyclic triterpenoid, or hopanoid.

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