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Author Tang N., Ma S., Zong W., Yang N., Lv Y., Yan C., Guo Z., Li J., Li X., Xiang Y., Song H., Xiao J., Li X., Xiong L.
Title MODD mediates deactivation and degradation of OsbZIP46 to negatively regulate ABA signaling and drought resistance in rice.
Abstract:
Plants have evolved complicated protective mechanisms to survive adverse conditions. Previously, we reported that the transcription factor OsbZIP46 regulates abscisic acid (ABA) signaling-mediated drought tolerance in rice (Oryza sativa) by modulating stress-related genes. An intrinsic D domain represses OsbZIP46 activity, but the detailed mechanism for the repression of OsbZIP46 activation remains unknown. Here, we report an OsbZIP46-interacting protein, MODD (Mediator of OsbZIP46 deactivation and degradation), which is homologous to the Arabidopsis thaliana ABSCISIC ACID-INSENSITIVE5 (ABI5)-binding protein AFP. MODD was induced by ABA and drought stress, but the induction was much slower than that of OsbZIP46. In contrast to OsbZIP46, MODD negatively regulates ABA signaling and drought tolerance, and inhibits the expression of OsbZIP46 target genes. We found that MODD negatively regulates OsbZIP46 activity and stability. MODD represses OsbZIP46 activity via interaction with the OsTPR3-HDA702 co-repressor complex and down-regulation of the histone acetylation level at OsbZIP46 target genes. MODD promotes OsbZIP46 degradation via interaction with the U-box type ubiquitin E3 ligase OsPUB70. Interestingly, the D domain is required for both deactivation and degradation of OsbZIP46 via its interaction with MODD. These findings show that plants fine-tune their drought responses by elaborate regulatory mechanisms, including the coordination of activity and stability of key transcription factors.
Journal Plant Cell
Country unknown
Volume
Pages
Year 2016
PubMed ID 27468891
PubMed Central ID -
DOI 10.1105/tpc.16.00171
URL -
Relation
Gene BZIP23 BZIP46 BZIP72 HDAC1 LEA3-1 RAB16A RAB16B RLCK197 SAPK9 WSI18 _ _
INSD -
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase