Format

Send to

Choose Destination
EMBO J. 2003 Nov 3;22(21):5817-26.

PKA and MAPK phosphorylation of Prf1 allows promoter discrimination in Ustilago maydis.

Author information

1
Max Planck Institute for Terrestrial Microbiology, Department of Organismic Interactions, Karl-von-Frisch-Strasse, D-35043 Marburg, Germany.

Abstract

Mating in Ustilago maydis requires cross-talk between cAMP and mitogen-activated protein kinase (MAPK) signalling. During this process, pheromone response factor 1 (Prf1) activates transcription of a and b mating type genes by binding to pheromone response elements (PREs) located in regulatory regions of these genes. Here, we show that PREs are also necessary and sufficient to mediate cAMP-induced gene expression. Prf1 interacts with cAMP-dependent protein kinase A (PKA) Adr1 as well as MAPK Kpp2 in vivo, and its central phosphorylation sites that are functionally important are modified by the respective kinases in vitro. PKA sites in Prf1 are essential for induced expression of a and b mating type genes. In contrast, MAPK sites are not required for pheromone-induced expression of a genes but are crucial for pheromone-responsive b gene expression. This illustrates how a single transcription factor can integrate signals from two pathways and how its phosphorylation status can determine different transcriptional responses.

PMID:
14592979
PMCID:
PMC275411
DOI:
10.1093/emboj/cdg554
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Wiley Icon for PubMed Central
Loading ...
Support Center