Dehydration-responsive element-binding (DREB) proteins specifically binding with dehydration-responsive element (DRE) have been identified as a kind of important transcription activator of plants under drought, high s...Dehydration-responsive element-binding (DREB) proteins specifically binding with dehydration-responsive element (DRE) have been identified as a kind of important transcription activator of plants under drought, high salt and cold stress. The conserved amino, acid residues of Val (14th residue) and Glu (19th residue) in AP2/EREBP domain of DREB1A have been identified to be two key points in determining the binding ability of DREB gene with DRE element. Using the yeast one-hybrid system, we isolated one maize DREB gene named maDREB1 by screening cDNA library. Trans-activation experiment in yeast reporter strain demonstrated that maDREB1 protein could function as a DREB transcription factor activating target gene expression by specifically binding to the DRE cis-element. To assess the functional significance of these two residues in maDREB1, the V14 and E19 were substituted individually or doubly by Ala and Asp. Point mutation analysis showed that V14 substitution made significant loss of binding ability with DRE element, while point mutation of E19 had less effect. If the substitution happened simultaneously to these two residues, it would lead to great loss of the ability of binding with DRE element. It suggested that V14 and E19 were both important in protein-DNA interacting in maDREB1, though 14V was more essential. The copy number and expression pattern of maDREB1 was discussed.展开更多
The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosi...The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosis are summarized in the paper.展开更多
Rice is moderately sensitive to salinity,and the response to salt stress is a complex process,including the perception and transduction of salt stress signal,the activation of specific transcriptional factors and the ...Rice is moderately sensitive to salinity,and the response to salt stress is a complex process,including the perception and transduction of salt stress signal,the activation of specific transcriptional factors and the expression of downstream stress-responsive genes.The functions of Na+ transporters which are involved in the maintenance and reconstruction of the ion homeostasis,transcriptional regulators and osmotic regulation genes were reviewed.Salt tolerance of plants are enhanced by Na+ vacuolar compartmentation or efflux or high levels of osmoprotectants accumulation in cytoplasm.展开更多
RIG-I is a pivotal cytoplasmic sensor that recognizes different species of viral RNAs. This recognition leads to activation of the transcription factors NF-κB and IRF3, which collaborate to induce type I interferons ...RIG-I is a pivotal cytoplasmic sensor that recognizes different species of viral RNAs. This recognition leads to activation of the transcription factors NF-κB and IRF3, which collaborate to induce type I interferons （IFNs） and innate antiviral response. In this study, we identified the TRIM family protein TRIM4 as a positive regulator of RIG-I-mediated IFN induction. Overexpression of TRIM4 potentiated virus-triggered activation of IRF3 and NF-κB, as well as IFN-13 induction, whereas knockdown of TRIM4 had opposite effects. Mechanistically, TRIM4 associates with RIG-I and targets it for K63-linked poiyubiquitination. Our findings demonstrate that TRIM4 is an important regulator of the virus-induced IFN induction pathways by mediating RIG-I for K63-Unked ubiquitination.展开更多
文摘Dehydration-responsive element-binding (DREB) proteins specifically binding with dehydration-responsive element (DRE) have been identified as a kind of important transcription activator of plants under drought, high salt and cold stress. The conserved amino, acid residues of Val (14th residue) and Glu (19th residue) in AP2/EREBP domain of DREB1A have been identified to be two key points in determining the binding ability of DREB gene with DRE element. Using the yeast one-hybrid system, we isolated one maize DREB gene named maDREB1 by screening cDNA library. Trans-activation experiment in yeast reporter strain demonstrated that maDREB1 protein could function as a DREB transcription factor activating target gene expression by specifically binding to the DRE cis-element. To assess the functional significance of these two residues in maDREB1, the V14 and E19 were substituted individually or doubly by Ala and Asp. Point mutation analysis showed that V14 substitution made significant loss of binding ability with DRE element, while point mutation of E19 had less effect. If the substitution happened simultaneously to these two residues, it would lead to great loss of the ability of binding with DRE element. It suggested that V14 and E19 were both important in protein-DNA interacting in maDREB1, though 14V was more essential. The copy number and expression pattern of maDREB1 was discussed.
文摘The regulation of heat shock transcription factor to heat shock protein expression and the newest knowledge about the effect of heat shock protein on aging,immune response and the balance of cell survival and apoptosis are summarized in the paper.
基金Supported by National High Technology Research and Development Program of China(2006AAl0ZlE8)Special Fund for Developing Super Rice from Ministry of Agriculture(200906)Project of Basic Research for National Non-profit Institute of China(2009RG005)
文摘Rice is moderately sensitive to salinity,and the response to salt stress is a complex process,including the perception and transduction of salt stress signal,the activation of specific transcriptional factors and the expression of downstream stress-responsive genes.The functions of Na+ transporters which are involved in the maintenance and reconstruction of the ion homeostasis,transcriptional regulators and osmotic regulation genes were reviewed.Salt tolerance of plants are enhanced by Na+ vacuolar compartmentation or efflux or high levels of osmoprotectants accumulation in cytoplasm.
基金Funding This work was supported by grants from the Ministry of Science and Technology of China （2012CB910201 and 2010CB911802） and the National Natural Science Foundation of China （31221061, 31130020, and 91029302）.
文摘RIG-I is a pivotal cytoplasmic sensor that recognizes different species of viral RNAs. This recognition leads to activation of the transcription factors NF-κB and IRF3, which collaborate to induce type I interferons （IFNs） and innate antiviral response. In this study, we identified the TRIM family protein TRIM4 as a positive regulator of RIG-I-mediated IFN induction. Overexpression of TRIM4 potentiated virus-triggered activation of IRF3 and NF-κB, as well as IFN-13 induction, whereas knockdown of TRIM4 had opposite effects. Mechanistically, TRIM4 associates with RIG-I and targets it for K63-linked poiyubiquitination. Our findings demonstrate that TRIM4 is an important regulator of the virus-induced IFN induction pathways by mediating RIG-I for K63-Unked ubiquitination.
