Wattsfaber3302

Recently, abundant evidence has clarified that long noncoding RNAs (lncRNAs) paly an oncogenic or anti-cancer role in the tumorigenesis and development of diverse human cancers. Described as a crucial regulator in some cancers, MIR22HG has not yet been studied in laryngocarcinoma and therefore the underlying regulatory role of MIR22HG in laryngocarcinoma is worth detecting. In this study, MIR22HG expression in laryngocarcinoma cells was confirmed to be down-regulated, and up-regulated MIR22HG expression led to suppressive effects on laryngocarcinoma cell proliferation and migration. Molecular mechanism assays revealed that MIR22HG sponges miR-5000-3p in laryngocarcinoma cells. Besides, decreased expression of miR-5000-3p suppressed laryngocarcinoma cell proliferation and migration. Moreover, FBXW7 was testified to be a downstream target gene of miR-5000-3p in laryngocarcinoma cells. More importantly, rescue assays verified that FBXW7 depletion or miR-5000-3p up-regulation countervailed the repressive effects of MIR22HG overexpression on laryngocarcinoma progression. What's more, E2F6 was proved to be capable of inhibiting MIR22HG transcription in laryngocarcinoma cells. To sum up, E2F6-induced down-regulation of MIR22HG promotes laryngocarcinoma progression through miR-5000-3p/FBXW7 axis. Copyright © 2020 American Society for Microbiology.RIPENING INHIBITOR (RIN) is a transcription factor with transcriptional activator activity that plays a major role in regulating fruit ripening in tomato (Solanum lycopersicum). Recent studies have revealed that (i) RIN is indispensable for full ripening but not for the induction of ripening and (ii) the rin mutation, which produces non-ripening fruits that never turn red or soften, is not a null mutation but instead converts the encoded transcriptional activator into a repressor. Here, we have uncovered aspects of RIN function by characterizing a series of allelic mutations within this locus that were produced by CRISPR/Cas9. Fruits of RIN-knockout plants, which showed partial ripening and low levels of lycopene but never turned fully red, showed excess flesh softening compared to the wild type. The knockout mutant fruits also showed accelerated cell wall degradation, suggesting that contrary to the conventional view, RIN represses over-ripening in addition to facilitating ripening. A C-terminal domain-truncated RIN protein, encoded by another allele of the RIN locus (rinG2), did not activate transcription but formed transcription factor complexes that bound to target genomic regions in a similar manner to wild-type RIN protein. Fruits expressing this truncated RIN protein exhibited extended shelf life, but unlike rin fruits, accumulated lycopene and appeared orange. The diverse ripening properties of the RIN allelic mutants suggest that substantial phenotypic variation can be produced by tuning the activity of a transcription factor. copyright, serif 2020 American Society of Plant Biologists. All rights reserved.Acyl carrier protein (ACP) is a highly conserved cofactor protein that is required by Type II fatty acid synthases (FAS). Here, we demonstrate that up to three mitochondrial ACP (mtACP) isoforms support the Arabidopsis (Arabidopsis thaliana) mitochondrially-localized Type II FAS. The physiological importance of the three mtACPs was evaluated by characterizing the single, double, and triple mutants. mtACP1 (At2g44620), mtACP2 (At1g65290), or mtACP3 (At5g47630) single mutants showed no discernible morphological growth phenotype. Functional redundancy among the three mtACPs was indicated by the embryo-lethal phenotype associated with simultaneous loss of all three mtACP genes. Characterization of all double mutant combinations revealed that although the mtacp1 mtacp3 and mtacp2 mtacp3 double mutant combinations showed no observable growth defect, the mtacp1 mtacp2 double mutant was viable but displayed delayed growth, reduced levels of post-translationally lipoylated mitochondrial proteins, hyperaccumulation of photorespiratory glycine, and reduced accumulation of many intermediates in central metabolism. These alterations were partially reversed when the mtacp1 mtacp2 double mutant plants were grown in a non-photorespiratory condition (i.e., 1% CO2 atmosphere) or in the presence of 2% sucrose. In summary, mtACP, as a key component of mitochondrial fatty acid biosynthesis, is important in generating the fatty acid precursor of lipoic acid biosynthesis. Thus, the incomplete lipoylation of mitochondrial proteins in mtacp mutants, particularly glycine decarboxylase, affects the recovery of photorespiratory carbon, and this appears to be critical during embryogenesis. copyright, serif 2020 American Society of Plant Biologists. All rights reserved.The plasma membrane (PM) provides a critical interface between plant cells and their environment to control cellular responses. To perceive the bacterial flagellin peptide flg22 for effective defense signaling, the immune receptor FLAGELLIN SENSING2 (FLS2) needs to be at its site of function, the PM, in the correct abundance. However, the intracellular machinery that controls PM accumulation of FLS2 remains largely undefined. Arabidopsis (Arabidopsis thaliana) clathrin adaptor EPSIN1 (EPS1) is implicated in clathrin-coated vesicle (CCV) formation at the trans-Golgi Network (TGN), likely aiding transport of cargo proteins from the TGN for proper location; but EPS1's impact on physiological responses remains elusive. Here, we identify EPS1 as a positive regulator of flg22-signaling and pattern-triggered immunity against Pseudomonas syringae pv. tomato (Pto) DC3000. read more We provide evidence that EPS1 contributes to modulating the PM abundance of defense proteins for effective immune signaling because in eps1, impaired flg22-signaling correlated with reduced PM accumulation of FLS2 and its co-receptor BRI1-ASSOCIATED RECEPTOR KINASE1 (BAK1). The eps1 mutant also exhibited reduced responses to the pathogen/damage-associated molecular patterns elf26 and AtPep1, which are perceived by the co-receptor BAK1 and cognate PM receptors. Furthermore, quantitative proteomics of enriched PM fractions revealed that EPS1 was required for proper PM abundance of a discreet subset of proteins with different cellular functions. In conclusion, our study expands the limited understanding of the physiological roles of EPSIN family members in plants and provides novel insight into the TGN-associated CCV trafficking machinery that impacts plant PM-derived defense processes. copyright, serif 2020 American Society of Plant Biologists. All rights reserved.