Natural occurrence of archaetidic acid and caldarchaetidic acid (di- and tetra-ether analogues of phosphatidic acid) in the archaebacterium Methanohacterium thermautotrophicum

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Abstract
A minor phospholipid designated as PL5, assumed to be a precursor of phospholipid biosynthesis, was isolated from Methanobacterium thermautotrophicum. The structures of this lipid and another closely related phospholipid (PL4) were elucidated by infrared spectra, fast atom bombardment mass spectra, 31P-nuclear magnetic resonance spectra, and chemical and enzymatic analyses. These lipids were identified as archaetidic acid (PL5) and caldarchaetidic acid (PL4) (diether and tetraether analogues of phosphatatidic acid, respectively).