A Distal CCAAT/NUCLEAR FACTOR Y Complex Promotes Chromatin Looping at the FLOWERING LOCUS T Promoter and Regulates the Timing of Flowering in Arabidopsis

作者：Cao, Shuanghe; Kumimoto, Roderick W.; Gnesutta, Nerina; Calogero, Alessandra M.; Mantovani, Roberto; Holt, Ben F., III^*

来源：Plant Cell, 2014, 26(3): 1009-1017.

DOI：10.1105/tpc.113.120352

• TISSUE-SPECIFIC EXPRESSION
• NF-Y
• TRANSCRIPTION FACTORS
• FLORAL INDUCTION
• FT PROTEIN
• QUANTITATIVE-ANALYSIS
• LONG-DISTANCE
• CONSTANS
• BINDING
• GENES

For many plant species, reproductive success relies on the proper timing of flowering, and photoperiod provides a key environmental input. Photoperiod-dependent flowering depends on timely expression of FLOWERING LOCUS T (FT); however, the coordination of various cis-regulatory elements in the FT promoter is not well understood. Here, we provide evidence that long-distance chromatin loops bring distal enhancer elements into close association with the proximal promoter elements bound by CONSTANS (CO). Additionally, we show that NUCLEAR FACTOR Y (NF-Y) binds a CCAAT box in the distal enhancer element and that CCAAT disruption dramatically reduces FT promoter activity. Thus, we propose the recruitment model of photoperiod-dependent flowering where NF-Y complexes, bound at the FT distal enhancer element, help recruit CO to proximal cis-regulatory elements and initiate the transition to reproductive growth.

• 出版日期2014-3