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Institute
- Institut für Biochemie und Biologie (325) (remove)
Chromatographic separation of the extract of the roots of Dorstenia kameruniana (family Moraceae) led to the isolation of three new benzylbenzofuran derivatives, 2-(p-hydroxybenzyl)benzofuran-6-ol (1), 2-(p-hydroxybenzyl)-7-methoxybenzofuran-6-ol (2) and 2-(p-hydroxy)-3-(3-methylbut-2-en-1-yl)benzyl)benzofuran-6-ol (3) (named dorsmerunin A, B and C, respectively), along with the known furanocoumarin, bergapten (4). The twigs of Dorstenia kameruniana also produced compounds 1-4 as well as the known chalcone licoagrochalcone A (5). The structures were elucidated by NMR spectroscopy and mass spectrometry. The isolated compounds displayed cytotoxicity against the sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 leukemia cells, where compounds 4 and 5 had the highest activities (IC50 values of 7.17 mu M and 5.16 mu M, respectively) against CCRF-CEM leukemia cells. Compound 5 also showed cytotoxicity against 7 sensitive or drug-resistant solid tumor cell lines (breast carcinoma, colon carcinoma, glioblastoma), with IC50 below 50 mu M, whilst 4 showed selective activity.
Um das Immunsystem der Pflanze zu manipulieren translozieren gram-negative pathogene Bakterien Typ-III Effektorproteine (T3E) über ein Typ-III Sekretionssystem (T3SS) in die pflanzliche Wirtszelle. Dort lokalisieren T3Es in verschiedenen subzellulären Kompartimenten, wo sie Zielproteine modifizieren und so die Infektion begünstigen. HopZ1a, ein T3E des Pflanzenpathogens Pseudomonas syringae pv. syringae, ist eine Acetyltransferase und lokalisiert über ein Myristolierungsmotiv an der Plasmamembran der Wirtszelle. Obwohl gezeigt wurde, dass HopZ1a die frühe Signalweiterleitung an der Plasmamembran stört, wurde bisher kein mit der Plasmamembran assoziiertes Zielprotein für diesen T3E identifiziert. Um bisher unbekannte HopZ1a-Zieleproteine zu identifizieren wurde im Vorfeld dieser Arbeit eine Hefe-Zwei-Hybrid-Durchmusterung mit einer cDNA-Bibliothek aus Tabak durchgeführt, wobei ein nicht näher charakterisiertes Remorin als Interaktor gefunden wurde.
Bei dem Remorin handelt es sich um einen Vertreter der Gruppe 4 der Remorin-Familie, weshalb es in NbREM4 umbenannt wurde. Durch den Einsatz verschiedener Interaktionsstudien konnte demonstriert werden, dass HopZ1a mit NbREM4 in Hefe, in vitro und in planta wechselwirkt. Es wurde ferner deutlich, dass HopZ1a auf spezifische Weise mit dem konservierten C-Terminus von NbREM4 interagiert, das Remorin jedoch in vitro nicht acetyliert. Analysen mittels BiFC haben zudem ergeben, dass NbREM4 in Homodimeren an der Plasmamembran lokalisiert, wo auch die Interaktion mit HopZ1a stattfindet.
Eine funktionelle Charakterisierung von NbREM4 ergab, dass das Remorin eine spezifische Rolle im Immunsystem der Pflanze einnimmt. Die transiente Expression in N. benthamiana induziert die Expression von Abwehrgenen sowie einen veränderten Blattphänotyp. In A. thaliana wird HopZ1a über das Decoy ZED1 und das R-Protein ZAR1 erkannt, was zur Auslösung einer starken Hypersensitiven Antwort (HR von hypersensitive response) führt. Es konnte im Rahmen dieser Arbeit gezeigt werden, dass ZAR1 in N. benthamiana konserviert ist, NbREM4 jedoch nicht in der ETI als Decoy fungiert. Mit Hilfe einer Hefe-Zwei-Hybrid-Durchmusterung mit NbZAR1 als Köder konnten zwei Proteine, die Catalase CAT1 und der Protonenpumpeninteraktor PPI1, als Interaktoren von NbZAR1 identifiziert werden, welche möglicherweise in der Regulation der HR eine Rolle spielen.
Aus Voruntersuchungen war bekannt, dass NbREM4 mit weiteren, nicht näher charakterisierten Proteinen aus Tabak interagieren könnte. Eine phylogenetische Einordnung hat gezeigt, dass es sich um die bekannte Immun-Kinase PBS1 sowie zwei E3-Ubiquitin-Ligasen, NbSINA1 und NbSINAL3, handelt. PBS1 interagiert mit NbREM4 an der Plasmamembran und phosphoryliert das Remorin innerhalb des intrinsisch ungeordneten N-Terminus. Mittels Massenspektrometrie konnten die Serine an Position 64 und 65 innerhalb der Aminosäuresequenz von NbREM4 als PBS1-abhängige Phosphorylierungsstellen identifiziert wurden.
NbSINA1 und NbSINAL3 besitzen in vitro Ubiquitinierungsaktivität, bilden Homo- und Heterodimere und interagieren ebenfalls mit dem N-terminalen Teil von NbREM4, wobei sie das Remorin in vitro nicht ubiquitinieren.
Aus den in dieser Arbeit gewonnenen Ergebnissen lässt sich ableiten, dass der bakterielle T3E HopZ1a gezielt mit dem Tabak-Remorin NbREM4 an der Plasmamembran interagiert und über einen noch unbekannten Mechanismus mit dem Immunsystem der Pflanze interferiert, wobei NbREM4 möglicherweise eine Rolle als Adapter- oder Ankerprotein zukommt, über welches HopZ1a mit weiteren Immunkomponenten interagiert. NbREM4 ist Teil eines größeren Immunnetzwerkes, zu welchem die bekannte Immun-Kinase PBS1 und zwei E3-Ubiquitin-Ligasen gehören. Mit NbREM4 konnte damit erstmalig ein membranständiges Protein mit einer Funktion im Immunsystem der Pflanze als Zielprotein von HopZ1a identifiziert werden.
The plant pathogen Pseudomonas syringae is a gram-negative bacterium which infects a wide range of plant species including important crops plants. To suppress plant immunity and cause disease P.syringae injects type-III effector proteins (T3Es) into the plant cell cytosol. In this study, we identified a novel target of the well characterized bacterial T3E HopZ1a. HopZ1a is an acetyltransferase that was shown to disrupt vesicle transport during innate immunity by acetylating tubulin. Using a yeast-two-hybrid screen approach, we identified a REMORIN (REM) protein from tobacco as a novel HopZ1a target. HopZ1a interacts with REM at the plasma membrane (PM) as shown by split-YFP experiments. Interestingly, we found that PBS1, a well-known kinase involved in plant immunity also interacts with REM in pull-down assays, and at the PM as shown by BiFC. Furthermore, we confirmed that REM is phosphorylated by PBS1 in vitro. Overexpression of REM provokes the upregulation of defense genes and leads to disease-like phenotypes pointing to a role of REM in plant immune signaling. Further protein-protein interaction studies reveal novel REM binding partners with a possible role in plant immune signaling. Thus, REM might act as an assembly hub for an immune signaling complex targeted by HopZ1a. Taken together, this is the first report describing that a REM protein is targeted by a bacterial effector. How HopZ1a might mechanistically manipulate the plant immune system through interfering with REM function will be discussed.
The prevalence of contaminant microbial DNA in ancient bone samples represents the principal limiting factor for palaeogenomic studies, as it may comprise more than 99% of DNA molecules obtained. Efforts to exclude or reduce this contaminant fraction have been numerous but also variable in their success. Here, we present a simple but highly effective method to increase the relative proportion of endogenous molecules obtained from ancient bones. Using computed tomography (CT) scanning, we identify the densest region of a bone as optimal for sampling. This approach accurately identifies the densest internal regions of petrous bones, which are known to be a source of high-purity ancient DNA. For ancient long bones, CT scans reveal a high-density outermost layer, which has been routinely removed and discarded prior to DNA extraction. For almost all long bones investigated, we find that targeted sampling of this outermost layer provides an increase in endogenous DNA content over that obtained from softer, trabecular bone. This targeted sampling can produce as much as 50-fold increase in the proportion of endogenous DNA, providing a directly proportional reduction in sequencing costs for shotgun sequencing experiments. The observed increases in endogenous DNA proportion are not associated with any reduction in absolute endogenous molecule recovery. Although sampling the outermost layer can result in higher levels of human contamination, some bones were found to have more contamination associated with the internal bone structures. Our method is highly consistent, reproducible and applicable across a wide range of bone types, ages and species. We predict that this discovery will greatly extend the potential to study ancient populations and species in the genomics era.
Characterization of altered inflorescence architecture in Arabidopsis thaliana BG-5 x Kro-0 hybrid
(2018)
A reciprocal cross between two A. thaliana accessions, Kro-0 (Krotzenburg, Germany) and BG-5 (Seattle, USA), displays purple rosette leaves and dwarf bushy phenotype in F1 hybrids when grown at 17 °C and a parental-like phenotype when grown at 21 °C. This F1 temperature-dependent-dwarf-bushy phenotype is characterized by reduced growth of the primary stem together with an increased number of branches. The reduced stem growth was the strongest at the first internode. In addition, we found that a temperature switch from 21 °C to 17 °C induced the phenotype only before the formation of the first internode of the stem. Similarly, the F1 dwarf-bushy phenotype could not be reversed when plants were shifted from 17 °C to 21 °C after the first internode was formed. Metabolic analysis showed that the F1 phenotype was associated with a significant upregulation of anthocyanin(s), kaempferol(s), salicylic acid, jasmonic acid and abscisic acid. As it has been previously shown that the dwarf-bushy phenotype is linked to two loci, one on chromosome 2 from Kro-0 and one on chromosome 3 from BG-5, an artificial micro-RNA approach was used to investigate the necessary genes on these intervals. From the results obtained, it was found that two genes, AT2G14120 that encodes for a DYNAMIN RELATED PROTEIN3B and AT2G14100 that encodes a member of the Cytochrome P450 family protein CYP705A13, were necessary for the appearance of the F1 phenotype on chromosome 2. It was also discovered that AT3G61035 that encodes for another cytochrome P450 family protein CYP705A13 and AT3G60840 that encodes for a MICROTUBULE-ASSOCIATED PROTEIN65-4 on chromosome 3 were both necessary for the induction of the F1 phenotype. To prove the causality of these genes, genomic constructs of the Kro-0 candidate genes on chromosome 2 were transferred to BG-5 and genomic constructs of the chromosome 3 candidate genes from BG-5 were transferred to Kro-0. The T1 lines showed that these genes are not sufficient alone to induce the phenotype. In addition to the F1 phenotype, more severe phenotypes were observed in the F2 generations that were grouped into five different phenotypic classes. Whilst seed yield was comparable between F1 hybrids and parental lines, three phenotypic classes in the F2 generation exhibited hybrid breakdown in the form of reproductive failure. This F2 hybrid breakdown was less sensitive to temperature and showed a dose-dependent effect of the loci involved in F1 phenotype. The severest class of hybrid breakdown phenotypes was observed only in the population of backcross with the parent Kro-0, which indicates a stronger contribution of the BG-5 allele when compared to the Kro-0 allele on the hybrid breakdown phenotypes. Overall, the findings of my thesis provide a further understanding of the genetic and metabolic factors underlying altered shoot architecture in hybrid dysfunction.
Genetic studies of the Eurasian brown bear (Ursus arctos) have so far focused on populations from Europe and North America, although the largest distribution area of brown bears is in Asia. In this study, we reveal population genetic parameters for the brown bear population inhabiting the Grand Kackar Mountains (GKM) in the north east of Turkey, western Lesser Caucasus. Using both hair (N = 147) and tissue samples (N = 7) collected between 2008 and 2014, we found substantial levels of genetic variation (10 microsatellite loci). Bear samples (hair) taken from rubbing trees worked better for genotyping than those from power poles, regardless of the year collected. Genotyping also revealed that bears moved between habitat patches, despite ongoing massive habitat alterations and the creation of large water reservoirs. This population has the potential to serve as a genetic reserve for future reintroduction in the Middle East. Due to the importance of the GKM population for on-going and future conservation actions, the impacts of habitat alterations in the region ought to be minimized; e.g., by establishing green bridges or corridors over reservoirs and major roads to maintain habitat connectivity and gene flow among populations in the Lesser Caucasus.
Carbon nanomaterials doped with some other lightweight elements were recently described as powerful, heterogeneous, metal-free organocatalysts, adding to their high performance in electrocatalysis. Here, recent observations in traditional catalysis are reviewed, and the underlying reaction mechanisms of the catalyzed organic transformations are explored. In some cases, these are due to specific active functional sites, but more generally the catalytic activity relates to collective properties of the conjugated nanocarbon frameworks and the electron transfer from and to the catalytic centers and substrates. It is shown that the !earnings are tightly related to those of electrocatalysis; i.e., the search for better electrocatalysts also improves chemocatalysis, and vice versa. Carbon-carbon heterojunction effects and some perspectives on future possibilities are discussed at the end.