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Trithorax Group Protein Oryza sativa Trithorax1 Controls Flowering Time in Rice via Interaction with Early heading date3
- Trithorax Group Protein Oryza sativa Trithorax1 Controls Flowering Time in Rice via Interaction with Early heading date3
- Choi, SC[Choi, Sang Chul]; Lee, S[Lee, Shinyoung]; Kim, SR[Kim, Sung-Ryul]; Lee, YS[Lee, Yang-Seok]; Liu, CY[Liu, Chunyan]; Cao, XF[Cao, Xiaofeng]; An, G[An, Gynheung]
- DGIST Authors
- Lee, S[Lee, Shinyoung]
- Issue Date
- Plant Physiology, 164(3), 1326-1337
- Article Type
- Amino Acid Motifs; Amino Acid Sequence; Bacterial DNA; Biological Model; Chemistry; Chromosome Segregation; DNA, Bacterial; Flower; Flowers; Gene Expression Regulation; Gene Expression Regulation, Plant; Genes, Plant; Genetics; Histone; Histones; Immunoprecipitation; Messenger RNA; Metabolism; Methylation; Models, Biological; Molecular Genetics; Molecular Sequence Data; Mutation; Nucleosome; Nucleosomes; Oryza Sativa; Phenotype; Photoperiod; Photoperiodicity; Physiology; Plant Gene; Plant Proteins; Plants, Genetically Modified; Protein Binding; Protein Motif; Protein Structure, Tertiary; Protein Tertiary Structure; Real-Time Polymerase Chain Reaction; Real Time Polymerase Chain Reaction; Recombinant Protein; Recombinant Proteins; Rice; RNA Interference; RNA, Messenger; T-DNA; T DNA; Time; Time Factors; Transgenic Plant; Vegetable Protein
- Trithorax group proteins are chromatin-remodeling factors that activate target gene expression by antagonistically functioning against the Polycomb group. In Arabidopsis (Arabidopsis thaliana), Arabidopsis Trithorax protein1 (ATX1) regulates flowering time and floral organ identity. Here, we observed that suppression of Oryza sativa Trithorax1 (OsTrx1), an ortholog of ATX1, delayed flowering time in rice (Oryza sativa). Because the delay occurred only under long-day conditions, we evaluated the flowering signal pathways that specifically function under long-day conditions. Among them, the OsMADS50 and Heading date1 pathways were not affected by the mutation. However, the Grain number, plant height, and heading date7 (Ghd7) pathway was altered in ostrx1. Transcript levels of OsGI, phytochrome genes, and Early heading date3 (Ehd3), which function upstream of Ghd7, were unchanged in the mutant. Because Trx group proteins form a complex with other proteins to modify the chromatin structure of target genes, we investigated whether OsTrx1 interacts with a previously identified protein that functions upstream of Ghd7. We demonstrated that the plant homeodomain motif of OsTrx1 binds to native histone H3 from the calf thymus and that OsTrx1 binds to Ehd3 through the region between the plant homeodomain and SET domains. Finally, we showed that the SET domain at the C-terminal end of OsTrx1 has histone H3 methyltransferase activity when incubated with oligonucleosomes. Our results suggest that OsTrx1 plays an important role in regulating flowering time in rice by modulating chromatin structure. © 2014 American Society of Plant Biologists. All rights reserved.
- American Society of Plant Biologists
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