Abstract
The bacterium 'Aquifex aeolicus' is the model organism for the deeply rooted phylum Aquificae. This 'water-maker' is an H2-oxidizing microaerophile that flourishes in extremely hot marine habitats, and it also thrives on the sulphur compounds commonly found in volcanic environments. 'A. aeolicus' has hyper-stable proteins and a fully sequenced genome, with some of its essential metabolic pathways deciphered (including energy conservation). Many of its proteins have also been characterized (especially structurally), including many of the enzymes involved in replication, transcription, RNA processing and cell envelope biosynthesis. Enzymes that are of promise for biotechnological applications have been widely investigated in this species. 'A. aeolicus' has also added to our understanding of the origins of life and evolution.
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