2-Methylthio-1,4-naphthoquinone, a new quinone from an extremely thermophilic hydrogen bacterium.

Abstract

Strain TK-6 is\an extremely thermophilic hydrogen bacterium isolated by the authors from a hot spring.1} The strain is an obligate chemolithotroph while all of the other hydrogen bacreria knownto date are facultative chemolithotrophs. So we studied the quinone system of TK-6, which is very useful for classifying this bacterium. This paper concerns the chemical structure of 2-methylthio-l,4naphthoquinone with a tetrahydrogenated isoprenoid side-chain isolated from TK-6 (Fig. A variety of quinones have been isolated from living matter. Nevertheless, to the best of our knowledge, a 2-methylthio-l,4-naphtho-