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Institute
- Institut für Biochemie und Biologie (1051) (remove)
Polyadenylation is a decisive 3’ end processing step during the maturation of pre-mRNAs. The length of the poly(A) tail has an impact on mRNA stability, localization and translatability. Accordingly, many eukaryotic organisms encode several copies of canonical poly(A) polymerases (cPAPs). The disruption of cPAPs in mammals results in lethality. In plants, reduced cPAP activity is non-lethal. Arabidopsis encodes three nuclear cPAPs, PAPS1, PAPS2 and PAPS4, which are constitutively expressed throughout the plant. Recently, the detailed analysis of Arabidopsis paps1 mutants revealed a subset of genes that is preferentially polyadenylated by the cPAP isoform PAPS1 (Vi et al. 2013). Thus, the specialization of cPAPs might allow the regulation of different sets of genes in order to optimally face developmental or environmental challenges.
To gain insights into the cPAP-based gene regulation in plants, the phenotypes of Arabidopsis cPAPs mutants under different conditions are characterized in detail in the following work. An involvement of all three cPAPs in flowering time regulation and stress response regulation is shown. While paps1 knockdown mutants flower early, paps4 and paps2 paps4 knockout mutants exhibit a moderate late-flowering phenotype. PAPS1 promotes the expression of the major flowering inhibitor FLC, supposedly by specific polyadenylation of an FLC activator. PAPS2 and PAPS4 exhibit partially overlapping functions and ensure timely flowering by repressing FLC and at least one other unidentified flowering inhibitor. The latter two cPAPs act in a novel regulatory pathway downstream of the autonomous pathway component FCA and act independently from the polyadenylation factors and flowering time regulators CstF64 and FY. Moreover, PAPS1 and PAPS2/PAPS4 are implicated in different stress response pathways in Arabidopsis. Reduced activity of the poly(A) polymerase PAPS1 results in enhanced resistance to osmotic and oxidative stress. Simultaneously, paps1 mutants are cold-sensitive. In contrast, PAPS2/PAPS4 are not involved in the regulation of osmotic or cold stress, but paps2 paps4 loss-of-function mutants exhibit enhanced sensitivity to oxidative stress provoked in the chloroplast. Thus, both PAPS1 and PAPS2/PAPS4 are required to maintain a balanced redox state in plants. PAPS1 seems to fulfil this function in concert with CPSF30, a polyadenylation factor that regulates alternative polyadenylation and tolerance to oxidative stress.
The individual paps mutant phenotypes and the cPAP-specific genetic interactions support the model of cPAP-dependent polyadenylation of selected mRNAs. The high similarity of the polyadenylation machineries in yeast, mammals and plants suggests that similar regulatory mechanisms might be present in other organism groups. The cPAP-dependent developmental and physiological pathways identified in this work allow the design of targeted experiments to better understand the ecological and molecular context underlying cPAP-specialization.
Viele klinische Schnelltestsysteme benötigen vorpräparierte oder aufgereinigte Analyte mit frisch hergestellten Lösungen. Fernab standardisierter Laborbedingungen wie z.B. in Entwicklungsländern oder Krisengebieten sind solche Voraussetzungen oft nur unter einem hohen Aufwand herstellbar.
Zusätzlich stellt die erforderliche Sensitivität die Entwicklung einfach zu handhabender Testsysteme vor große Herausforderungen.
Autokatalytische Reaktionen, die sich mit Hilfe sehr geringer Initiatorkonzentrationen auslösen lassen, können hier eine Perspektive für Signalverstärkungsprozesse bieten.
Aus diesem Grund wird im ersten Teil der vorliegenden Arbeit das Verhalten der autokatalytischen Arsenit-Jodat-Reaktion in einem mikrofluidischen Kanal untersucht. Dabei werden insbesondere die diffusiven und konvektiven Einflüsse auf die Reaktionskinetik im Vergleich zu makroskopischen Volumenmengen betrachtet.
Im zweiten Teil werden thermoresponsive Hydrogele mit einem kanalstrukturierten Papiernetzwerk zu einem neuartigen, kapillargetriebenen, extern steuerbaren Mikrofluidik-System kombiniert. Das hier vorgestellte Konzept durch Hydrogele ein papierbasiertes LOC-System zu steuern, ermöglicht zukünftig die Herstellung von komplexeren, steuerbaren Point-Of-Care Testsystemen (POCT). Durch z.B. einen thermischen Stimulus, wird das Lösungsverhalten eines Hydrogels so verändert, dass die gespeicherte Flüssigkeit freigesetzt und durch die Kapillarkraft des Papierkanals ins System transportiert wird. Die Eigenschaften dieses Gelnetzwerks können dabei so eingestellt werden, dass eine Freisetzung von Flüssigkeiten sogar bei Körpertemperatur möglich wäre und damit eine Anwendung gänzlich ohne weitere Hilfsmittel denkbar ist. Für die Anwendung notwendige Chemikalien oder Enzyme lassen sich hierbei bequem in getrocknetem Zustand im Papiersubstrat vorlagern und bei Bedarf in Lösung bringen.
Im abschließenden dritten Teil der Arbeit wird ein durch Hydrogele betriebener, Antikörper-basierter Mikroorganismenschnelltest für Escherichia coli präsentiert. Darüber hinaus wird weiterführend eine einfache Methode zur Funktionalisierung eines Hydrogels mit Biomolekülen über EDC/NHS-Kopplung vorgestellt.
Weltweit streben Anti-Doping Institute danach jene Sportler zu überführen, welche sich unerlaubter Mittel oder Methoden bedienen. Die hierfür notwendigen Testsysteme werden kontinuierlich weiterentwickelt und neue Methoden aufgrund neuer Wirkstoffe der Pharmaindustrie etabliert. Gegenstand dieser Arbeit war es, eine parallele Mehrkomponentenanalyse auf Basis von Antigen-Antikörper Reaktionen zu entwickeln, bei dem es primär um Verringerung des benötigten Probevolumens und der Versuchszeit im Vergleich zu einem Standard Nachweis-Verfahren ging. Neben der Verwendung eines Multiplex Ansatzes und der Mikroarraytechnologie stellten ebenfalls die Genauigkeit aller Messparameter, die Stabilität des Versuchsaufbaus sowie die Performance über einen Einfach-Blind-Ansatz Herausforderungen dar. Die Anforderung an den Multiplex Ansatz, keine falschen Signale trotz ähnlicher Strukturen zu messen, konnte durch die gezielte Kombination von spezifischen Antikörpern realisiert werden. Hierfür wurden neben Kreuzreaktivitätstests auf dem Mikroarray parallel erfolgreich Western Blot Versuche durchgeführt. Jene Antikörper, welche in diesen Versuchen die gesetzten Anforderungen erfüllten, wurden für das Ermitteln der kleinsten nachweisbaren Konzentration verwendet. Über das Optimieren der Versuchsbedingungen konnte unter Verwendung von Tween in der Waschlösung sowohl auf Glas als auch auf Kunststoff die Hintergrundfluoreszenz reduziert und somit eine Steigerung des Signal/Hintergrundverhältnisses erreicht werden. In den Versuchen zu Ermittlung der Bestimmungsgrenze wurde für das humane Choriongonadotropin (hCG-i) eine Konzentration von 10 mU/ml, für dessen beta-Untereinheit (hCG-beta) eine Konzentration von 3,6 mU/ml und für das luteinisierende Hormon (LH) eine Konzentration von 10 mU/ml bestimmt. Den ermittelten Wert im Serum für das hCG-i entspricht dem von der Welt-Anti-Dopin-Agentur (WADA) geforderten Wert in Urin von 5 mU/ml. Neben der Ermittlung von Bestimmungsgrenzen wurden diese hinsichtlich auftretender Matrixeffekte in Serum und Blut gemessen. Wie aus den Versuchen zur Ermittlung von Kreuzreaktivitäten auf dem Mikroarray zu entnehmen ist, lassen sich das LH, das hCG-i und hCG-β ebenfalls in Serum und Blut messen. Die Durchführung einer Performance-Analyse über einem Einfach-Blind-Ansatz mit 130 Serum Proben, wurde ebenfalls über dieses System realisiert. Die ausgewerteten Proben wurden anschließend über eine Grenzwertoptimierungskurve analysiert und die diagnostische Spezifität ermittelt. Für die Messungen des LH konnte eine Sensitivität und Spezifität von 100% erreicht werden. Demnach wurden alle negativen und positiven Proben eindeutig interpretiert. Für das hCG-β konnte ebenfalls eine Spezifität von 100% und eine Sensitivität von 97% erreicht werden. Die hCG-i Proben wurden mit einer Spezifität von 100% und eine Sensitivität von 97,5% gemessen. Um den Nachweis zu erbringen, dass dieser Versuchsaufbau über mehrere Wochen stabile Signale bei Vermessen von identischen Proben liefert, wurde ein über zwölf Wochen angesetzter Stabilitätstest für alle Parameter erfolgreich in Serum und Blut durchgeführt. Zusammenfassend konnte in dieser Arbeit erfolgreich eine Mehrkomponentenanalyse als Multiplex Ansatz auf einem Mikroarray entwickelt werden. Die Durchführung der Performance-Analyse und des Stabilitätstests zeigen bereits die mögliche Einsatzfähigkeit dieses Tests im Kontext einer Dopinganalyse.
Untersuchungen zur pro-inflammatorischen Wirkung von Serum-Amyloid A in glatten Gefäßmuskelzellen
(2014)
Der Bittergeschmack dient Säugern vermutlich zur Wahrnehmung und Vermeidung toxischer Substanzen. Bitterstoffe können jedoch auch gesund sein oder werden oft bereitwillig mit der Nahrung aufgenommen. Ob sie geschmacklich unterschieden werden können, ist allerdings umstritten. Detektiert werden Bitterstoffe von oralen Bittergeschmacksrezeptoren, den TAS2R (human) bzw. Tas2r (murin). In der Literatur gibt es aber immer mehr Hinweise darauf, dass überdies Tas2r nicht nur in extragustatorischen Organen exprimiert werden, sondern dort auch wichtige Aufgaben erfüllen könnten, was wiederum die Aufklärung ihrer noch nicht vollständig entschlüsselten Funktionsweisen erfordert. So ist noch unbekannt, ob alle bisher als funktionell identifizierten Tas2r wirklich gustatorische Funktionen erfüllen.
Im Rahmen der Charakterisierung neu generierter, im Locus des Bittergeschmacksrezeptors Tas2r131 genetisch modifizierter Mauslinien, wurde in vorliegender Arbeit die gustatorische sowie extragustatorische Expression von Tas2r131 untersucht. Dass Tas2r131 nicht nur in Pilzpapillen, Wall- und Blätterpapillen (VP+FoP), Gaumen, Ductus nasopalatinus, Vomeronasalorgan und Kehldeckel, sondern auch in Thymus, Testes und Nebenhodenkopf, in Gehirnarealen sowie im Ganglion geniculatum nachgewiesen wurde, bildete die Grundlage für weiterführende Studien. Die vorliegende Arbeit zeigt außerdem, dass Tas2r108, Tas2r126, Tas2r135, Tas2r137 und Tas2r143 in Blut exprimiert werden, was auf eine heterogene Funktion der Tas2r hindeutet. Dass zusätzlich erstmals die Expression aller 35 als funktionell beschriebenen Tas2r im gustatorischen VP+FoP-Epithel von C57BL/6-Mäusen nachgewiesen wurde, verweist auf deren Relevanz als funktionelle Geschmacksrezeptoren.
Weiter zeigten Untersuchungen zur Aufklärung eines möglichen Bitter-Unterscheidungsvermögens in Geschmackspapillen von Mäusen mit fluoreszenzmarkierten oder ablatierten Tas2r131-Zellen, dass Tas2r131 exprimierende Zellen eine Tas2r-Zellsubpopulation bilden. Darüber hinaus existieren innerhalb der Bitterzellen geordnete Tas2r-Expressionsmuster, die sich nach der chromosomalen Lage ihrer Gene richten. Isolierte Bitterzellen reagieren heterogen auf bekannte Bitterstoffe. Und Mäuse mit ablatierter Tas2r131-Zellpopulation besitzen noch andere Tas2r-Zellen und schmecken damit einige Bitterstoffe kaum noch, andere aber noch sehr gut. Diese Befunde belegen die Existenz verschiedener gustatorischer Tas2r-Zellpopulationen, welche die Voraussetzung bilden, Bitterstoffe heterogen zu detektieren. Ob dies die Grundlage für ein divergierendes Verhalten gegenüber unverträglichen und harmlosen oder gar nützlichen Bitterstoffen darstellt, kann mit Hilfe der dargelegten Tas2r-Expressionsmuster künftig in Verhaltensexperimenten geprüft werden.
Die Bittergeschmackswahrnehmung in Säugetieren stellt sich als ein hochkomplexer Mechanismus dar, dessen Vielschichtigkeit durch die hier neu aufgezeigten heterogenen Tas2r-Expressions- und Funktionsmuster erneut verdeutlicht wird.
Characterization of drought tolerance in potato cultivars for identification of molecular markers
(2014)
Plant cell walls are complex structures that underpin plant growth and are widely exploited in diverse human activities thus placing them with a central importance in biology. Cell walls have been a prominent area of research for a long time, but the chemical complexity and diversity of cell walls not just between species, but also within plants, between cell-types, and between cell wall micro-domains pose several challenges. Progress accelerated several-fold in cell wall biology owing to advances in sequencing technology, aided soon thereafter by advances in omics and imaging technologies. This development provides additional perspectives of cell walls across a rapidly growing number of species, highlighting a myriad of architectures, compositions, and functions.
Furthermore, rather than the component centric view, integrative analysis of the different cell wall components across system-levels help to gain a more in-depth understanding of the structure and biosynthesis of the cell envelope and its interactions with the environment.
To this end, in this work three case studies are detailed, all pertaining to the integrative analysis of heterogeneous cell wall related data arising from different system-levels and analytical techniques. A detailed account of multiblock methods is provided and in particular canonical correlation and regression methods of data integration are discussed. In the first integrative analysis, by employing canonical correlation analysis - a multivariate statistical technique to study the association between two datasets - novel insight to the relationship between glycans and phenotypic traits is gained. In addition, sparse partial least squares regression approach that adapts Lasso penalization and allows for the selection of a subset of variables was employed. The second case study focuses on an integrative analysis of images obtained from different spectroscopic techniques. By employing yet another multiblock approach - multiple co-inertia analysis, insitu biochemical composition of cell walls from different cell-types is studied thereby highlighting the common and complementary parts of the two hyperspectral imaging techniques. Finally, the third integrative analysis facilitates gene expression analysis of the Arabidopsis root transcriptome and translatome for the identification of cell wall related genes and compare expression patterns of cell wall synthesis genes. The computational analysis considered correlation and variation of expression across cell-types at both system-levels, and also provides insight into the degree of co-regulatory relationships that are preserved between the two processes.
The integrative analysis of glycan data and phenotypic traits in cotton fibers using canonical methods led to the identification of specific polysaccharides which may play a major role during fiber development for the final fiber characteristics. Furthermore, this analysis provides a base for future studies on glycan arrays in case of developing cotton fibers. The integrative analysis of images from infrared and Raman spectroscopic approaches allowed the coupling of different analytical techniques to characterize complex biological material, thereby, representing various facets of their chemical properties. Moreover, the results from the co-inertia analysis demonstrated that the study was well adapted as it is relevant for coupling data tables in a symmetric way. Several indicators are proposed to investigate how the global and block scores are related. In addition, studying the root cells of \textit{Arabidopsis thaliana} allowed positing a novel pipeline to systematically investigate and integrate the different levels of information available at the global and single-cell level. The conducted analysis also confirms that previously identified key transcriptional activators of secondary cell wall development display highly conserved patterns of transcription and translation across the investigated cell-types. Moreover, the biological processes that display conserved and divergent patterns based on the cell-type-specific expression and translation levels are identified.
Monoclonal antibodies (mAbs) are engineered immunoglobulins G (IgG) used for more than 20 years as targeted therapy in oncology, infectious diseases and (auto-)immune disorders. Their protein nature greatly influences their pharmacokinetics (PK), presenting typical linear and non-linear behaviors.
While it is common to use empirical modeling to analyze clinical PK data of mAbs, there is neither clear consensus nor guidance to, on one hand, select the structure of classical compartment models and on the other hand, interpret mechanistically PK parameters. The mechanistic knowledge present in physiologically-based PK (PBPK) models is likely to support rational classical model selection and thus, a methodology to link empirical and PBPK models is desirable. However, published PBPK models for mAbs are quite diverse in respect to the physiology of distribution spaces and the parameterization of the non-specific elimination involving the neonatal Fc receptor (FcRn) and endogenous IgG (IgGendo). The remarkable discrepancy between the simplicity of biodistribution data and the complexity of published PBPK models translates in parameter identifiability issues.
In this thesis, we address this problem with a simplified PBPK model—derived from a hierarchy of more detailed PBPK models and based on simplifications of tissue distribution model. With the novel tissue model, we are breaking new grounds in mechanistic modeling of mAbs disposition: We demonstrate that binding to FcRn is indeed linear and that it is not possible to infer which tissues are involved in the unspecific elimination of wild-type mAbs. We also provide a new approach to predict tissue partition coefficients based on mechanistic insights: We directly link tissue partition coefficients (Ktis) to data-driven and species-independent published antibody biodistribution coefficients (ABCtis) and thus, we ensure the extrapolation from pre-clinical species to human with the simplified PBPK model. We further extend the simplified PBPK model to account for a target, relevant to characterize the non-linear clearance due to mAb-target interaction.
With model reduction techniques, we reduce the dimensionality of the simplified PBPK model to design 2-compartment models, thus guiding classical model development with physiological and mechanistic interpretation of the PK parameters. We finally derive a new scaling approach for anatomical and physiological parameters in PBPK models that translates the inter-individual variability into the design of mechanistic covariate models with direct link to classical compartment models, specially useful for PK population analysis during clinical development.
Protein-metal coordination complexes are well known as active centers in enzymatic catalysis, and to contribute to signal transduction, gas transport, and to hormone function. Additionally, they are now known to contribute as load-bearing cross-links to the mechanical properties of several biological materials, including the jaws of Nereis worms and the byssal threads of marine mussels. The primary aim of this thesis work is to better understand the role of protein-metal cross-links in the mechanical properties of biological materials, using the mussel byssus as a model system. Specifically, the focus is on histidine-metal cross-links as sacrificial bonds in the fibrous core of the byssal thread (Chapter 4) and L-3,4-dihydroxyphenylalanine (DOPA)-metal bonds in the protective thread cuticle (Chapter 5).
Byssal threads are protein fibers, which mussels use to attach to various substrates at the seashore. These relatively stiff fibers have the ability to extend up to about 100 % strain, dissipating large amounts of mechanical energy from crashing waves, for example. Remarkably, following damage from cyclic loading, initial mechanical properties are subsequently recovered by a material-intrinsic self-healing capability. Histidine residues coordinated to transition metal ions in the proteins comprising the fibrous thread core have been suggested as reversible sacrificial bonds that contribute to self-healing; however, this remains to be substantiated in situ. In the first part of this thesis, the role of metal coordination bonds in the thread core was investigated using several spectroscopic methods. In particular, X-ray absorption spectroscopy (XAS) was applied to probe the coordination environment of zinc in Mytilus californianus threads at various stages during stretching and subsequent healing. Analysis of the extended X-ray absorption fine structure (EXAFS) suggests that tensile deformation of threads is correlated with the rupture of Zn-coordination bonds and that self-healing is connected with the reorganization of Zn-coordination bond topologies rather than the mere reformation of Zn-coordination bonds. These findings have interesting implications for the design of self-healing metallopolymers.
The byssus cuticle is a protective coating surrounding the fibrous thread core that is both as hard as an epoxy and extensible up to 100 % strain before cracking. It was shown previously that cuticle stiffness and hardness largely depend on the presence of Fe-DOPA coordination bonds. However, the byssus is known to concentrate a large variety of metals from seawater, some of which are also capable of binding DOPA (e.g. V). Therefore, the question arises whether natural variation of metal composition can affect the mechanical performance of the byssal thread cuticle. To investigate this hypothesis, nanoindentation and confocal Raman spectroscopy were applied to the cuticle of native threads, threads with metals removed (EDTA treated), and threads in which the metal ions in the native tissue were replaced by either Fe or V. Interestingly, replacement of metal ions with either Fe or V leads to the full recovery of native mechanical properties with no statistical difference between each other or the native properties. This likely indicates that a fixed number of metal coordination sites are maintained within the byssal thread cuticle – possibly achieved during thread formation – which may provide an evolutionarily relevant mechanism for maintaining reliable mechanics in an unpredictable environment.
While the dynamic exchange of bonds plays a vital role in the mechanical behavior and self-healing in the thread core by allowing them to act as reversible sacrificial bonds, the compatibility of DOPA with other metals allows an inherent adaptability of the thread cuticle to changing circumstances. The requirements to both of these materials can be met by the dynamic nature of the protein-metal cross-links, whereas covalent cross-linking would fail to provide the adaptability of the cuticle and the self-healing of the core. In summary, these studies of the thread core and the thread cuticle serve to underline the important and dynamic roles of protein-metal coordination in the mechanical function of load-bearing protein fibers, such as the mussel byssus.
Inferring gene regulatory networks and cellular phases from time-resolved transcriptomics data
(2014)
The adaptation of cell growth and proliferation to environmental changes is essential for the surviving of biological systems. The evolutionary conserved Ser/Thr protein kinase “Target of Rapamycin” (TOR) has emerged as a major signaling node that integrates the sensing of numerous growth signals to the coordinated regulation of cellular metabolism and growth. Although the TOR signaling pathway has been widely studied in heterotrophic organisms, the research on TOR in photosynthetic eukaryotes has been hampered by the reported land plant resistance to rapamycin. Thus, the finding that Chlamydomonas reinhardtii is sensitive to rapamycin, establish this unicellular green alga as a useful model system to investigate TOR signaling in photosynthetic eukaryotes.
The observation that rapamycin does not fully arrest Chlamydomonas growth, which is different from observations made in other organisms, prompted us to investigate the regulatory function of TOR in Chlamydomonas in context of the cell cycle. Therefore, a growth system that allowed synchronously growth under widely unperturbed cultivation in a fermenter system was set up and the synchronized cells were characterized in detail. In a highly resolved kinetic study, the synchronized cells were analyzed for their changes in cytological parameters as cell number and size distribution and their starch content. Furthermore, we applied mass spectrometric analysis for profiling of primary and lipid metabolism. This system was then used to analyze the response dynamics of the Chlamydomonas metabolome and lipidome to TOR-inhibition by rapamycin
The results show that TOR inhibition reduces cell growth, delays cell division and daughter cell release and results in a 50% reduced cell number at the end of the cell cycle. Consistent with the growth phenotype we observed strong changes in carbon and nitrogen partitioning in the direction of rapid conversion into carbon and nitrogen storage through an accumulation of starch, triacylglycerol and arginine. Interestingly, it seems that the conversion of carbon into triacylglycerol occurred faster than into starch after TOR inhibition, which may indicate a more dominant role of TOR in the regulation of TAG biosynthesis than in the regulation of starch.
This study clearly shows, for the first time, a complex picture of metabolic and lipidomic dynamically changes during the cell cycle of Chlamydomonas reinhardtii and furthermore reveals a complex regulation and adjustment of metabolite pools and lipid composition in response to TOR inhibition.
Cyanobacteria produce about 40 percent of the world’s primary biomass, but also a variety of often toxic peptides such as microcystin. Mass developments, so called blooms, can pose a real threat to the drinking water supply in many parts of the world. This study aimed at characterizing the biological function of microcystin production in one of the most common bloom-forming cyanobacterium Microcystis aeruginosa.
In a first attempt, the effect of elevated light intensity on microcystin production and its binding to cellular proteins was studied. Therefore, conventional microcystin quantification techniques were combined with protein-biochemical methods. RubisCO, the key enzyme for primary carbon fixation was a major microcystin interaction partner. High light exposition strongly stimulated microcystin-protein interactions. Up to 60 percent of the total cellular microcystin was detected bound to proteins, i.e. inaccessible for standard quantification procedures. Underestimation of total microcystin contents when neglecting the protein fraction was also demonstrated in field samples. Finally, an immuno-fluorescence based method was developed to identify microcystin producing cyanobacteria in mixed populations.
The high light induced microcystin interaction with proteins suggested an impact of the secondary metabolite on the primary metabolism of Microcystis by e.g. modulating the activity of enzymes. For addressing that question, a comprehensive GC/MS-based approach was conducted to compare the accumulation of metabolites in the wild-type of Microcystis aeruginosa PCC 7806 and the microcystin deficient ΔmcyB mutant. From all 501 detected non-redundant metabolites 85 (17 percent) accumulated significantly different in either of both genotypes upon high light exposition. Accumulation of compatible solutes in the ΔmcyB mutant suggests a role of microcystin in fine-tuning the metabolic flow to prevent stress related to excess light, high oxygen concentration and carbon limitation.
Co-analysis of the widely used model cyanobacterium Synechocystis PCC 6803 revealed profound metabolic differences between species of cyanobacteria. Whereas Microcystis channeled more resources towards carbohydrate synthesis, Synechocystis invested more in amino acids. These findings were supported by electron microscopy of high light treated cells and the quantification of storage compounds. While Microcystis accumulated mainly glycogen to about 8.5 percent of its fresh weight within three hours, Synechocystis produced higher amounts of cyanophycin. The results showed that the characterization of species-specific metabolic features should gain more attention with regard to the biotechnological use of cyanobacteria.