Arabidopsis AtERF71/HRE2 functions as transcriptional activator via cis-acting GCC box or DRE/CRT element and is involved in root development through regulation of root cell expansion
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AtERF71/HRE2 binds to GCC box or DRE/CRT as transcription activator and plays an important role in root development via root cell expansion regulation.
AtERF71/HRE2 transcription factor, a member of the AP2/ERF family, plays a key role in the stress response. GCC box and DRE/CRT, both essential cis-acting elements, have been shown to be recognized by AP2/ERF family transcription factors. However, it remains unclear whether or not AtERF71/HRE2 directly interacts with GCC box and/or DRE/CRT. Here, we showed that AtERF71/HRE2 binds to GCC box and DRE/CRT by electrophoretic mobility shift assay (EMSA). Binding of AtERF71/HRE2 to GCC box and DRE/CRT was also detected by fluorescence measurement and surface plasmon resonance spectroscopy (BIAcore) experiments. Folding properties of AtERF71/HRE2 proteins were characterized by CD spectroscopy, and AtERF71/HRE2 showed thermal stability as evidenced by two endothermic peaks (T d) at 53 and 65 °C. In addition, AtERF71/HRE2 showed transcriptional activation activity via GCC box and DRE/CRT in Arabidopsis protoplasts. Interestingly, AtERF71/HRE2 OXs showed increased primary root length due to elevated root cell expansion. Our data indicate that AtERF71/HRE2 binds to both GCC box and DRE/CRT, transactivates expression of genes downstream via GCC box or DRE/CRT, and plays an important role in root development through regulation of root cell expansion.
KeywordsAtERF71/HRE2 DRE/CRT GCC box Transactivation
Ethylene responsive factor
Hypoxia responsive ERF
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2012R1A1B3001815 and 2014R1A1A2009023) and by the Research Fund Program of Research Institute for Basic Sciences, Pusan National University, Korea, 2013, Project No. RIBS-PNU-2013-306.
Conflict of interest
The authors have no conflict of interest.
- Xu ZS, Xia LQ, Chen M, Cheng XG, Zhang RY, Li LC, Zhao YX, Lu Y, Ni ZY, Liu L, Qiu ZG, Ma YZ (2007) Isolation and molecular characterization of the Triticum aestivum L. ethylene-responsive factor 1 (TaERF1) that increases multiple stress tolerance. Plant Mol Biol 65:719–732PubMedCrossRefGoogle Scholar
- Zhang H, Huang Z, Xie B, Chen Q, Tian X, Zhang X, Zhang H, Lu X, Huang D, Huang R (2004) The ethylene-, jasmonate-, abscisic acid-, and NaCl-responsive tomato transcription factor JERF1 modulates expression of GCC box-containing genes and salt tolerance in tobacco. Planta 220:262–270PubMedCrossRefGoogle Scholar