* Department of Microbiology, Immunology, and Molecular Genetics,
and Molecular Biology Institute, University of California, Los Angeles,
CA 90095-1489; Contributed by Melvin I. Simon, November 30, 2001
We determined and annotated the complete 2.2-megabase
genome sequence of Pyrobaculum aerophilum, a
facultatively aerobic nitrate-reducing hyperthermophilic
(Topt = 100°C) crenarchaeon. Clues
were found suggesting explanations of the organism's surprising
intolerance to sulfur, which may aid in the development of methods for
genetic studies of the organism. Many interesting features worthy of
further genetic studies were revealed. Whole genome computational
analysis confirmed experiments showing that P.
aerophilum (and perhaps all crenarchaea) lack 5' untranslated
regions in their mRNAs and thus appear not to use a ribosome-binding
site (Shine-Dalgarno)-based mechanism for translation initiation at
the 5' end of transcripts. Inspection of the lengths and distribution
of mononucleotide repeat-tracts revealed some interesting features. For
instance, it was seen that mononucleotide repeat-tracts of Gs (or Cs)
are highly unstable, a pattern expected for an organism deficient in
mismatch repair. This result, together with an independent study on
mutation rates, suggests a "mutator" phenotype.
Microbiology
Genome sequence of the hyperthermophilic crenarchaeon
Pyrobaculum aerophilum
,
,
IGPP Center for Astrobiology, University
of California, Los Angeles, CA 90095-1567; § Division of
Biology, 147-75, California Institute of Technology, Pasadena, CA
91125; and ¶ Archaeenzentrum, Regensburg University, 93053 Regensburg, Germany
Present address: School of Medicine, University of
California, Davis, CA 95616.
To whom reprint requests should be addressed.
E-mail: jhmiller{at}mbi.ucla.edu.
www.pnas.org/cgi/doi/10.1073/pnas.241636498
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