Abstract
Publisher Summary Methanocaldococcus ( Methanococcus ) jannaschii strain JAL-1 is a hyperthermophilic methanogenic archaeon that was isolated from surface material collected at a “white smoker” chimney at a depth of 2600 m in the East Pacific Rise near the western coast of Mexico. Cells are irregular cocci possessing polar bundles of flagella. The cell envelope is composed of a cytoplasmic membrane and a protein surface layer. Similar isolates have been obtained from hydrothermally active sediments in the Guaymas Basin and the Mid-Atlantic Ridge, and related species have been found at other marine hydrothermal vents. Because these hyperthermophilic species are very different from the mesophilic methanococci, they have been reclassified into a new family, Methanocaldococcaceae , and two new genera, Methanocaldococcus and Methanotorris . The characteristics of the source material for these isolates suggest that they possess adaptations for growth at high temperature and pressure as well as moderate salinity.
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