Details

Autor(en) / Beteiligte

• Michielse, C. B.
• Pfannmüller, A.
• Macios, M.
• Rengers, P.
• Dzikowska, A.
• Tudzynski, B.

Titel

The interplay between the GATA transcription factors AreA , the global nitrogen regulator and AreB in F usarium fujikuroi

Ist Teil von

• Molecular microbiology, 2014-02, Vol.91 (3), p.472-493

Erscheinungsjahr

2014

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• Summary Nitrogen metabolite repression ( NMR ) in filamentous fungi is controlled by the GATA transcription factors AreA and AreB . While AreA mainly acts as a positive regulator of NMR ‐sensitive genes, the role of AreB is not well understood. We report the characterization of AreB and its interplay with AreA in the gibberellin‐producing fungus F usarium fujikuroi . The areB locus produces three different transcripts that each code for functional proteins fully complementing the areB deletion mutant that influence growth and secondary metabolism. However, under nitrogen repression, the AreB isoforms differ in subcellular localization indicating distinct functions under these conditions. In addition, AreA and two isoforms of AreB colocalize in the nucleus under low nitrogen, but their nuclear localization disappears under conditions of high nitrogen. Using a bimolecular fluorescence complementation ( BiFC ) approach we showed for the first time that one of the AreB isoforms interacts with AreA when starved of nitrogen. Cross‐species complementation revealed that some AreB functions are retained between F . fujikuroi and A spergillus nidulans while others have diverged. By comparison to other fungi where AreB was postulated to function as a negative counterpart of AreA , AreB can act as both repressor and activator of transcription in F . fujikuroi .