Quinones of Thermoplasma acidophilum HO-62 were analyzed by high-performanc
e liquid chromatography, mass spectrometry, and nuclear magnetic resonance.
Menaquinone, methionaquinone, and 2-trans and 2-cis forms of thermoplasmaq
uinone were identified. The relative amount of thermoplasmaquinone increase
d under anaerobic conditions, and those of menaquinone and methionaquinone
increased under aerobic conditions.