Abstract:
:Biochemical responses to cold and osmotic stresses overlap because each decreases the availability of free water. Since RNA-binding proteins are known to accumulate following cold stress and play key roles in regulating transcription termination, the effect of osmotic stress on expression of RNA-binding proteins was examined. The transcript levels of four genes encoding RNA-binding proteins (rbpA, rbpB, rbpC and rbpD) were monitored in Anabaena sp. PCC 7120 cultures supplemented with ammonium ions or growing under nitrogen-fixing conditions. Steady-state transcript levels of all four genes increased transiently in response to a temperature shift from 30 to 20 degrees C under both nitrogen regimes. Osmotic stress also enhanced rbpB, rbpC and rbpD gene expression in ammonium grown cultures. In the absence of a combined nitrogen source, osmotic stress repressed the short-term induction of rbp gene expression. The accumulation of RNA-binding proteins did not follow transcript levels, but remained high 24 h after stress initiation. It is concluded that nitrogen nutrition modulates the stress-responsive regulation of RNA-binding proteins in cyanobacteria, providing a potential mechanism to integrate environmental and developmental signals.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Mori S,Castoreno A,Mulligan ME,Lammers PJdoi
10.1016/S0378-1097(03)00682-7keywords:
subject
Has Abstractpub_date
2003-10-24 00:00:00pages
203-10issue
2eissn
0378-1097issn
1574-6968pii
S0378109703006827journal_volume
227pub_type
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journal_title:FEMS microbiology letters
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