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Overexpression of Hevea brasiliensis ethylene response factor HbERF‐IXc5 enhances growth and tolerance to abiotic stress and affects laticifer differentiation 下载免费PDF全文
Retno Lestari Maryannick Rio Florence Martin Julie Leclercq Natthakorn Woraathasin Sandrine Roques Florence Dessailly Anne Clément‐Vidal Christine Sanier Denis Fabre Sémi Melliti Sony Suharsono Pascal Montoro 《Plant biotechnology journal》2018,16(1):322-336
Ethylene response factor 1 (ERF1) is an essential integrator of the jasmonate and ethylene signalling pathways coordinating a large number of genes involved in plant defences. Its orthologue in Hevea brasiliensis, HbERF‐IXc5, has been assumed to play a major role in laticifer metabolism and tolerance to harvesting stress for better latex production. This study sets out to establish and characterize rubber transgenic lines overexpressing HbERF‐IXc5. Overexpression of HbERF‐IXc5 dramatically enhanced plant growth and enabled plants to maintain some ecophysiological parameters in response to abiotic stress such as water deficit, cold and salt treatments. This study revealed that HbERF‐IXc5 has rubber‐specific functions compared to Arabidopsis ERF1 as transgenic plants overexpressing HbERF‐IXc5 accumulated more starch and differentiated more latex cells at the histological level. The role of HbERF‐IXc5 in driving the expression of some target genes involved in laticifer differentiation is discussed. 相似文献
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Bernard Barlaam Sabina Cosulich Martina Fitzek Hervé Germain Stephen Green Lyndsey L. Hanson Craig S. Harris Urs Hancox Kevin Hudson Christine Lambert-van der Brempt Maryannick Lamorlette Françoise Magnien Gilles Ouvry Ken Page Linette Ruston Lara Ward Bénédicte Delouvrié 《Bioorganic & medicinal chemistry letters》2017,27(13):3030-3035
We report the discovery of a novel aminopyrazine series of PI3Kα inhibitors, designed by hybridizing two known scaffolds of PI3K inhibitors. We describe the progress achieved from the first compounds plagued with poor general kinase selectivity to compounds showing high selectivity for PI3Kα over PI3Kβ and excellent general kinase selectivity. This effort culminated with the identification of compound 5 displaying high potency and selectivity, and suitable physiochemical and pharmacokinetic properties for oral administration. In vivo, compound 5 showed good inhibition of tumour growth (86% tumour growth inhibition at 50 mg/kg twice daily orally) in the MCF7 xenograft model in mice. 相似文献
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Ernoult-Lange M Wilczynska A Harper M Aigueperse C Dautry F Kress M Weil D 《Molecular biology of the cell》2009,20(1):176-187
The translational regulator CPEB1 plays a major role in the control of maternal mRNA in oocytes, as well as of subsynaptic mRNAs in neurons. Although mainly cytoplasmic, we found that CPEB1 protein is continuously shuttling between nucleus and cytoplasm. Its export is controlled by two redundant NES motifs dependent on the nuclear export receptor Crm1. In the nucleus, CPEB1 accumulates in a few foci most often associated with nucleoli. These foci are different from previously identified nuclear bodies. They contain Crm1 and were called Crm1 nucleolar bodies (CNoBs). CNoBs depend on RNA polymerase I activity, indicating a role in ribosome biogenesis. However, although they form in the nucleolus, they never migrate to the nuclear envelope, precluding a role as a mediator for ribosome export. They could rather constitute a platform providing factors for ribosome assembly or export. The behavior of CPEB1 in CNoBs raises the possibility that it is involved in ribosome biogenesis. 相似文献
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M Ernoult-Lange S Baconnais M Harper N Minshall S Souquere T Boudier M Bénard P Andrey G Pierron M Kress N Standart E le Cam D Weil 《RNA (New York, N.Y.)》2012,18(9):1702-1715
Translational repression is achieved by protein complexes that typically bind 3' UTR mRNA motifs and interfere with the formation of the cap-dependent initiation complex, resulting in mRNPs with a closed-loop conformation. We demonstrate here that the human DEAD-box protein Rck/p54, which is a component of such complexes and central to P-body assembly, is in considerable molecular excess with respect to cellular mRNAs and enriched to a concentration of 0.5 mM in P-bodies, where it is organized in clusters. Accordingly, multiple binding of p54 proteins along mRNA molecules was detected in vivo. Consistently, the purified protein bound RNA with no sequence specificity and high nanomolar affinity. Moreover, bound RNA molecules had a relaxed conformation. While RNA binding was ATP independent, relaxing of bound RNA was dependent on ATP, though not on its hydrolysis. We propose that Rck/p54 recruitment by sequence-specific translational repressors leads to further binding of Rck/p54 along mRNA molecules, resulting in their masking, unwinding, and ultimately recruitment to P-bodies. Rck/p54 proteins located at the 5' extremity of mRNA can then recruit the decapping complex, thus coupling translational repression and mRNA degradation. 相似文献
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Arnould JC Delouvrié B Boutron P Dossetter AG Foote KM Hamon A Hancox U Harris CS Hutton M Lamorlette M Matusiak Z 《Bioorganic & medicinal chemistry letters》2007,17(23):6448-6454
A new class of small-molecule GnRH antagonists, the thieno[2,3-b]pyrroles, was designed. Herein, the synthesis and structure-activity relationships are described. Substitution at the C4 position was investigated; during this study, it was observed that introducing piperazines and piperidines improved the physical properties of the compounds while retaining good in vitro potency. This exploration led to the discovery of amidopiperidines with improved pharmacokinetic properties. 相似文献
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