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Methanoihermus fervidus  belongs to the group of hyperthermophilic Archaea. The Archaea comprise organisms that live under environmental extremes, like high temperature, low  p H value or high salt concentration. The outer surface of the pseudomurein sacculi of the cells of  Methanothermus fervidus  is covered by glycoprotein subunits ( S -layer) directly exposed to the extreme environment. The elucidation of the crystal structure of this surface glycoprotein may provide important information on the survival strategies of these unusual micro-organisms. Before our investigations neither three-dimensional crystals have been obtained nor X-ray analyses were performed. Only electron microscopic and computer image enhancement techniques have been applied to obtain structural information from crystalline two-dimensional  S -layer sheets. We describe here the successful crystallization of this surface glycoprotein under microgravity conditions.

The first successful crystallization of a prokaryotic extremely thermophilic outer surface layer glycoprotein