Journal
TRENDS IN PLANT SCIENCE
Volume 19, Issue 8, Pages 538-545Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tplants.2014.03.012
Keywords
chromatin remodeling; circadian clock; E3 ubiquitin ligase; HOS1; mRNA export; photoperiodic flowering
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Funding
- National Research Foundation of Korea [20120005600, 2012055546]
- Next-Generation BioGreen 21 Program (Plant Molecular Breeding Center) by the Rural Development Administration [201203013055290010200]
- Agricultural R&D Promotion Center [309017-05-4-HD140]
- Korea Ministry for Food, Agriculture, Forestry, and Fisheries
- Human Frontier Science Program [RGP0002/2012]
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The E3 ubiquitin ligase HIGH EXPRESSION OF OSMOTICALLY RESPONSIVE GENES 1 (HOS1) functions as a cold signaling attenuator by degrading the INDUCER OF CBF EXPRESSION 1 transcription factor, which is a key regulator of the cold-induced transcriptome and freezing tolerance in plants. Recent studies demonstrate that HOS1 also plays nonproteolytic roles in gene expression regulation. HOS1 acts as a chromatin remodeling factor that modulates FLOWERING LOCUS C chromatin in cold regulation of flowering time. It associates with the nuclear pore complex to facilitate nucleocytoplasmic mRNA export to maintain circadian periodicity over a range of light and temperature conditions. In this review, we summarize recent advances in molecular mechanisms underlying HOS1 function during plant development in response to fluctuating environmental conditions.
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