期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 50, 页码 12823-12828出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1809526115
关键词
TOR; RPS6; translation; photomorphogenesis; light
资金
- Ministry of Science and Technology, Taiwan [MOST103-2321-B-001-060-, MOST104-2321-B-001-027-, MOST105-2321-B-001-017-, MOST106-2321-B-001-011-, MOST107-2321-B-001-007-]
- Academia Sinica Investigator Award
- National Institutes of Health [R01GM60493]
- Ministry of Science and Technology, Taiwan
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM060493] Funding Source: NIH RePORTER
Deetiolation is an essential developmental process transforming young plant seedlings into the vegetative phase with photosynthetic activities. Light signals initiate this important developmental process by triggering massive reprogramming of the transcriptome and translatome. Compared with the wealth of knowledge of transcriptional regulation, the molecular mechanism underlying this light-triggered translational enhancement remains unclear. Here we show that light-enhanced translation is orchestrated by a light perception and signaling pathway composed of photoreceptors, CONSTITUTIVE PHOTOMORPHOGENESIS 1 (COP1), the phytohormone auxin, target of rapamycin (TOR), and ribosomal protein S6 (RPS6). In deetiolating Arabidopsis seedlings, photoreceptors, including phytochrome A and cryptochromes, perceive far-red and blue light to inactivate the negative regulator COP1, which leads to activation of the auxin pathway for TOR-dependent phosphorylation of RPS6. Arabidopsis mutants defective in TOR, RPS6A, or RPS6B exhibited delayed cotyledon opening, a characteristic of the deetiolating process to ensure timely vegetative development of a young seedling. This study provides a mechanistic view of light-triggered translational enhancement in deetiolating Arabidopsis.
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