A basic helix-loop-helix 104 (bHLH104) protein functions as a transcriptional repressor for glucose and abscisic acid signaling in Arabidopsis

• Published in: Plant physiology and biochemistry 2019-03, Vol.136, p.34-42
• Main Authors: Min, Ji-Hee, Park, Cho-Rong, Jang, Yun-Ha, Ju, Hyun-Woo, Lee, Kyeong-Hwan, Lee, Sungbeom, Kim, Cheol Soo
• Format: Article
• Language: English
• Subjects: Abscisic acid; AtPGR; bHLH104; Glucose; Glucose-responsive cis-element; Transcriptional repressor
• ISSN: 0981-9428; 1873-2690
• DOI: 10.1016/j.plaphy.2019.01.008

Transduction of glucose (Glc) signaling is critical for plant development, metabolism, and stress responses. However, identifying initial Glc sensing and response stimulating mechanisms in plants has been difficult due to dual functions of glucose as energy sources and signaling component. A basic Helix-Loop-Helix 104 (bHLH104) protein is a homolog of bHLH34 previously isolated from Arabidopsis that functions as a transcriptional activator of Glc and abscisic acid (ABA) responses. In this study, we characterized bHLH104 as a transcription factor that binds to the regulatory region of Arabidopsis Plasma membrane Glc-responsive Regulator (AtPGR) gene. The bHLH104 binds to 5′-AANA-3′ element of the promoter region of AtPGR in vitro and represses beta-glucuronidase (GUS) activity in AtPGR promoter-GUS transgenic plants. Genetic approaches show that bHLH104 positively regulates Glc and abscisic acid (ABA) response. These results suggest that bHLH104 is involved in Glc- and ABA-mediated signaling pathway. Taken together, these findings provide evidence that bHLH104 is an important transcription regulator in plant-sensitivity to Glc and ABA signaling. •bHLH104 binds to the 5′-AANA-3′ element of the AtPGR promoter regulatory region.•bHLH104 represses the transcriptional activity of AtPGR in planta.•bHLH104 is capable of modulating ABA and glucose responses.