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RrmA regulates the stability of specific transcripts in response to both nitrogen source and oxidative stress
Author(s) -
Krol Kinga,
Morozov Igor Y.,
Jones Meriel G.,
Wyszomirski Tomasz,
Weglenski Piotr,
Dzikowska Agnieszka,
Caddick Mark X.
Publication year - 2013
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/mmi.12324
Subject(s) - biology , oxidative stress , fight or flight response , microbiology and biotechnology , oxidative phosphorylation , stability (learning theory) , computational biology , biochemistry , gene , machine learning , computer science
Summary Differential regulation of transcript stability is an effective means by which an organism can modulate gene expression. A well‐characterized example is glutamine signalled degradation of specific transcripts in A spergillus nidulans . In the case of areA , which encodes a wide‐domain transcription factor mediating nitrogen metabolite repression, the signal is mediated through a highly conserved region of the 3′ UTR . Utilizing this RNA sequence we isolated RrmA , an RNA recognition motif protein. Disruption of the respective gene led to loss of both glutamine signalled transcript degradation as well as nitrate signalled stabilization of niaD m RNA . However, nitrogen starvation was shown to act independently of RrmA in stabilizing certain transcripts. RrmA was also implicated in the regulation of arginine catabolism gene expression and the oxidative stress responses at the level of m RN A stability. Δ rrmA mutants are hypersensitive to oxidative stress. This phenotype correlates with destabilization of eifE and dhsA m RNA . eifE encodes eIF5A , a translation factor within which a conserved lysine is post‐translationally modified to hypusine, a process requiring DhsA . Intriguingly, for specific transcripts RrmA mediates both stabilization and destabilization and the specificity of the signals transduced is transcript dependent, suggesting it acts in consort with other factors which differ between transcripts.