Isolation and characterization of novel neutral glycolipids from Thermoplasma acidophilum

• Published in: Biochimica et biophysica acta Vol. 1439; no. 3; pp. 363 - 370
• Main Authors: Uda, Ikuko, Sugai, Akihiko, Kon, Kazuo, Ando, Susumu, Itoh, Yuko H., Itoh, Toshihiro
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 18-08-1999
• Subjects: Archaea; Carbohydrates - analysis; Carbohydrates - chemistry; Chromatography, Thin Layer; Ether lipid; Glycolipid; Glycolipids - chemistry; Glycolipids - isolation & purification; Gulose; Mass Spectrometry; Molecular Structure; Thermoplasma - chemistry; Thermoplasma acidophilum; Ether lipid; Gulose; Thermoplasma acidophilum; Archaea; Glycolipid
• ISSN: 1388-1981; 0006-3002; 1879-2618
• DOI: 10.1016/S1388-1981(99)00114-6

Several novel neutral glycolipids (GL-1a, GL-1b, GL-2a, GL-2b and GL-2c) were isolated from
Thermoplasma acidophilum by high-performance liquid chromatography using phenylboronic acid-silica and preparative thin-layer chromatography. The tentative structures of these lipids were characterized by the combination of gas–liquid chromatography, the methylation procedure, and
1H-NMR and FAB-mass spectrometries. The lipophilic portion of the neutral glycolipids was composed of a simple molecular species named caldarchaeol (dibiphytanyl-diglycerol tetraether). The sugar moieties of these glycolipids were composed of gulose and glucose which formed monosaccharide residues on one side or both sides of the core lipids. Gulose was attached to the terminal glycerol OH group of the core lipid with a β-configuration and glucose being attached with an α-configuration. The proposed structure of GL-1a was gulosylcaldarchaeol and that of GL-1b was glucosylcaldarchaeol. The structures of GL-2a, GL-2b, and GL-2c were the analogs of the caldarchaeol derivatives attached by a variety of gulosyl residues or glucosyl residues on both sides of the terminal OH groups.