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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schumaker, Karen S. Zheng, Yuan Guo, Yan |
| Description | Author Affiliation: Zheng Y ( State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100094, China.); |
| Abstract | The phytohormone abscisic acid (ABA) plays an essential role in plant development and during the response of the plant to abiotic stress. In this study, we report that the R2R3-type transcription factor MYB30 is involved in the regulation of ABA signaling. Arabidopsis mutants lacking MYB30 are hypersensitive to ABA during germination and seedling growth. A K283R substitution in MYB30 blocks its SUMO E3 ligase SIZ1-mediated sumoylation in Arabidopsis protoplasts, indicating that MYB30 is sumoylated by SIZ1 and that K283 is the principal site for small ubiquitin-like modifier conjugation. Expression of MYB30(K283R) in myb30 partially rescues the mutant ABA-hypersensitive phenotype, but expression of wild-type MYB30 complements the mutant phenotype. Overexpression of MYB30 in wild-type results in an ABA-insensitive phenotype, whereas overexpression of MYB30 in the siz1 mutant does not alter siz1 hypersensitivity to ABA. The siz1-2 myb30-2 double-mutant exhibits greater ABA sensitivity than either single mutant, but a mutation in the SIZ1-sumoylated ABI5 transcription factor suppresses the ABA hypersensitivity of myb30-2 to wild-type levels. Our results suggest that coordination of ABI5 and MYB30 sumoylation by SIZ1 may balance gene expression, which is required for regulation of ABA signaling during seed germination. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 31 |
| Volume Number | 109 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2012-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Abscisic Acid Metabolism Arabidopsis Proteins Arabidopsis Ligases Sumoylation Physiology Transcription Factors Ubiquitin-Protein Ligases Genetics Amino Acid Substitution Basic-Leucine Zipper Transcription Factors Gene Expression Regulation, Plant Germination Mutation, Missense Signal Transduction Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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