한빛사 논문
Inseop Chun 1, Hyo Jung Kim 2, Sunghyun Hong 3, Yeon-Gil Kim 4, Min-Sung Kim 1
1Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, Republic of Korea
2Center for Plant Aging Research, Institute for Basic Science, Daegu, Republic of Korea
3Center for Genome Engineering, Institute for Basic Science, Daejeon, Republic of Korea
4Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang, Republic of Korea
Corresponding author: Min-Sung Kim
Abstract
Plants use sophisticated mechanisms of gene expression to control senescence in response to environmental stress or aging. ORE1 (Arabidopsis thaliana NAC092) is a master regulator of senescence that belongs to the plant-specific NAC transcription factor protein family. ORE1 has been reported to bind to multiple DNA targets to orchestrate leaf senescence, yet the mechanistic basis for recognition of the cognate gene sequence remains unclear. Here, we report the crystal structure of the ORE1-NAC domain alone and its DNA-binding form. The structure of DNA-bound ORE1-NAC revealed the molecular basis for nucleobase recognition and phosphate backbone interactions. We show that local versatility in the DNA-binding site, in combination with domain flexibility of the ORE-NAC homodimer, is crucial for the maintenance of binding to intrinsically flexible DNA. Our results provide a platform for understanding other plant-specific NAC protein-DNA interactions as well as insight into the structural basis of NAC regulators in plants of agronomic and scientific importance.
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