Abstract
An extremely thermophilic methanogen was isolated from hydrothermal vent sediment (80°–120° C) collected from the Guaymas Basin, Gulf of California, at a depth of approximately 2000 m. The isolate was a characteristic member of the genus Methanococcus based on its coccoid morphology, ability to produce methane from CO2 and H2, and DNA base composition (31.4 mol% G+C); it is distinguished from previously described extremely thermophilic vent methanogens by its ability to grow and produce methane from formate and in the composition of membrane lipids. The temperature range for growth was 48°–94° C (optimum near 85° C); the pH optimum was 6.0. The isolate grew autotrophically but was stimulated by selenium and growth nutrients supplied by yeast extract and trypticase. Extracted polar lipids consisted primarily of diphytanyl glycerol diether (62%), macrocyclic glycerol diether (15.3%), and dibiphytanyl glycerol tetraether (11.8%). Neutral lipids were dominated by a series of C30 isoprenoids; in addition, a novel series of C35 isoprenoids were detected. The isolate appears to be a close relative of the previously described Methanococcus jannaschii, isolated from the East Pacific Rise hydrothermal vent system. From the frequency of isolation, it appears that extremely thermophilic methanococci are the predominant representatives of the methanogenic archaebacteria occurring at deep sea hydrothermal vents.
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Jones, W.J., Stugard, C.E. & Jannasch, H.W. Comparison of thermophilic methanogens from submarine hydrothermal vents. Arch. Microbiol. 151, 314–318 (1989). https://doi.org/10.1007/BF00406557
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DOI: https://doi.org/10.1007/BF00406557