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Microbiol. Rev., Dec 1995, 604-622, Vol 59, No. 4
MJ Merrick and RA Edwards
Nitrogen metabolism in prokaryotes involves the coordinated expression of a
large number of enzymes concerned with both utilization of extracellular
nitrogen sources and intracellular biosynthesis of nitrogen-containing
compounds. The control of this expression is determined by the availability
of fixed nitrogen to the cell and is effected by complex regulatory
networks involving regulation at both the transcriptional and
posttranslational levels. While the most detailed studies to date have been
carried out with enteric bacteria, there is a considerable body of evidence
to show that the nitrogen regulation (ntr) systems described in the
enterics extend to many other genera. Furthermore, as the range of bacteria
in which the phenomenon of nitrogen control is examined is being extended,
new regulatory mechanisms are also being discovered. In this review, we
have attempted to summarize recent research in prokaryotic nitrogen
control; to show the ubiquity of the ntr system, at least in gram-negative
organisms; and to identify those areas and groups of organisms about which
there is much still to learn.
Copyright © 1995, American Society for Microbiology
Nitrogen control in bacteria
Nitrogen Fixation Laboratory, John Innes Centre, Norwich, United Kingdom.
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