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Glucosylcaldarchaetidylglycerol, a minor phosphoglycolipid from Thermoplasma acidophilum
1Division of Chemistry, Center for Natural Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa, Japan. uda@cals.kitasato-u.ac.jp
Abstract:
A novel phosphoglycolipid (GPL-K) was isolated from Thermoplasma acidophilum (ATCC 27658). The chemical components of GPL-K were analyzed by gas liquid chromatography and GC-MS. The sugar moiety of GPL-K and its anomeric region were analyzed by NMR assignment. The core lipid of GPL-K was caldarchaeol, and its main hydrocarbon chains were acyclic and monocyclic C(40) biphytanyl. The polar head groups were alpha-glucose and glycerophosphate. The negative FAB-MS spectrum of GPL-K confirmed that the lipid peak of m/z 1614 consists of a caldarchaeol (including one cyclopentane ring), a hexose sugar, and a glycerophosphate. We have proposed the tentative structure of GPL-K.