Martin Hagemann
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View article: Inter-strain diversity among coastal picocyanobacteria across salinity gradients
Inter-strain diversity among coastal picocyanobacteria across salinity gradients Open
Strains of the picocyanobacteria genera Synechococcus and Cyanobium occur in cold-temperate zones from coastal waters to the open ocean, spanning a range of salinities and water depths. To thrive across different salinities, picocyanobacte…
View article: The impact of CP12 on the metabolome of cyanobacteria under fluctuating CO2 conditions
The impact of CP12 on the metabolome of cyanobacteria under fluctuating CO2 conditions Open
All organisms that perform oxygenic photosynthesis fix inorganic CO 2 through the Calvin-Benson-Bassham (CBB) cycle, which is then converted into many organic compounds in associated pathways of primary carbon and nitrogen metabolism. Auto…
View article: Fructose-1,6-bisphosphatase (FBPase) is involved in heterotrophic growth and glycogen metabolism in cyanobacteria
Fructose-1,6-bisphosphatase (FBPase) is involved in heterotrophic growth and glycogen metabolism in cyanobacteria Open
Cyanobacteria switch between photoautotrophic and heterotrophic carbon metabolism during diurnal cycles. A classical control point is characterized by two glycolytic phosphofructokinases (PFKs) and a bifunctional fructose-1,6-biphosphatase…
View article: Diurnal rhythm causes metabolic crises in the cyanobacterial mutants of c-di-AMP signaling cascade
Diurnal rhythm causes metabolic crises in the cyanobacterial mutants of c-di-AMP signaling cascade Open
The photoautotrophic lifestyle of cyanobacteria has to cope with the successive diurnal changes. We previously highlighted a unique function of the carbon control protein, SbtB, and its effector molecule c-di-AMP, for nighttime survival th…
View article: Positional <scp><sup>13</sup>C</scp> enrichment analysis of aspartate determines <scp>PEPC</scp> activity <i>in vivo</i>
Positional <span><sup>13</sup>C</span> enrichment analysis of aspartate determines <span>PEPC</span> activity <i>in vivo</i> Open
Summary Photoautotrophic organisms fix inorganic carbon (Ci) by RIBULOSE‐1,5‐BISPHOSPHATE CARBOXYLASE/OXYGENASE (RUBISCO) and PHOSPHOENOLPYRUVATE CARBOXYLASE (PEPC). Monitoring Ci assimilation rates in vivo is a major challenge in analyzin…
View article: Evidence for a <scp> CO <sub>2</sub> </scp> ‐concentrating mechanism in the model streptophyte green alga <i>Chara braunii</i>
Evidence for a <span> CO <sub>2</sub> </span> ‐concentrating mechanism in the model streptophyte green alga <i>Chara braunii</i> Open
Summary Oxygenic photosynthesis in streptophytic algae, such as Charophyceae, is often impeded by low CO 2 levels in aquatic habitats. Consequently, many algal groups evolved a CO 2 ‐concentrating mechanism (CCM). However, its presence in …
View article: <i>In vivo</i> RUBISCO activity in <i>Synechocystis</i> is regulated by RuBP availability
<i>In vivo</i> RUBISCO activity in <i>Synechocystis</i> is regulated by RuBP availability Open
Ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) is the main CO 2 -fixing enzyme on earth and entry point of carbon into the Calvin-Benson-Bassham cycle. Fueled by photosynthesis, C-assimilation by RUBISCO must be tightly controll…
View article: Guard cell‐specific glycine decarboxylase manipulation affects Arabidopsis photosynthesis, growth and stomatal behavior
Guard cell‐specific glycine decarboxylase manipulation affects Arabidopsis photosynthesis, growth and stomatal behavior Open
Summary Photorespiration is a mandatory metabolic repair shunt of carbon fixation by the Calvin–Benson cycle in oxygenic phototrophs. Its extent depends mainly on the CO 2 : O 2 ratio in chloroplasts, which is regulated via stomatal moveme…
View article: Improved photorespiration has a major impact on the root metabolome of Arabidopsis
Improved photorespiration has a major impact on the root metabolome of Arabidopsis Open
Photorespiration is an essential metabolic repair process in oxygenic photosynthesis, as it detoxifies Rubisco's inhibitory oxygenase byproduct, 2‐phosphoglycolate (2‐PG). It has been demonstrated that improving endogenous photorespiration…
View article: The regulatory impact of serine/threonine-specific protein phosphorylation among cyanobacteria
The regulatory impact of serine/threonine-specific protein phosphorylation among cyanobacteria Open
Cyanobacteria are the only prokaryotes capable of performing oxygenic photosynthesis. To thrive under environmental fluctuations, photosynthesis and metabolic activities needs to be adjusted. Previous studies showed that the acclimation of…
View article: Dynamic photosynthetic labeling and carbon-positional mass spectrometry monitor in vivo RUBISCO carbon assimilation rates
Dynamic photosynthetic labeling and carbon-positional mass spectrometry monitor in vivo RUBISCO carbon assimilation rates Open
RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE/OXYGENASE (RUBISCO) is the most abundant enzyme and CO2 bio-sequestration system on Earth. Its in vivo activity is usually determined by 14CO2 incorporation into 3-phosphoglycerate (3PGA). However, the…
View article: Characterization of the oxygen-tolerant formate dehydrogenase from Clostridium carboxidivorans
Characterization of the oxygen-tolerant formate dehydrogenase from Clostridium carboxidivorans Open
Fixation of CO 2 into the organic compound formate by formate dehydrogenases (FDHs) is regarded as the oldest autotrophic process on Earth. It has been proposed that an FDH-dependent CO 2 fixation module could support CO 2 assimilation eve…
View article: Retention of a SulP-family bicarbonate transporter in a periplasmic N2-fixing cyanobacterial endosymbiont of an open ocean diatom
Retention of a SulP-family bicarbonate transporter in a periplasmic N2-fixing cyanobacterial endosymbiont of an open ocean diatom Open
Symbioses between diatoms and the N2-fixing, heterocyst-forming cyanobacteria Richelia spp. are widespread and contribute to primary production. Unique to these symbioses is a variation in the symbiont location: one lives in the host cytop…
View article: Impact of Heavy Weather Events on Pelagic Cyanobacterial Communities: An in Situ Mesocosm Study in the Gulf of Finland
Impact of Heavy Weather Events on Pelagic Cyanobacterial Communities: An in Situ Mesocosm Study in the Gulf of Finland Open
View article: Deciphering the tight metabolite‐level regulation of glucose‐1‐phosphate adenylyltransferase ( <scp>GlgC</scp> ) for glycogen synthesis in cyanobacteria
Deciphering the tight metabolite‐level regulation of glucose‐1‐phosphate adenylyltransferase ( <span>GlgC</span> ) for glycogen synthesis in cyanobacteria Open
The enzyme glucose‐1‐phosphate adenylyltransferase (GlgC, EC:2.7.7.27) catalyses the first step in glycogen synthesis by converting glucose‐1‐phosphate into ADP‐glucose, which is added in turn to a growing glycogen chain by glycogen syntha…
View article: Epigenetic control of tetrapyrrole biosynthesis by m4C DNA methylation in a cyanobacterium
Epigenetic control of tetrapyrrole biosynthesis by m4C DNA methylation in a cyanobacterium Open
Epigenetic DNA modifications are pivotal in eukaryotic gene expression, but their regulatory significance in bacteria is less understood. In Synechocystis 6803, the DNA methyltransferase M.Ssp6803II modifies the first cytosine in the GGCC …
View article: Structure function analysis of ADP-dependent cyanobacterial phosphofructokinase reveals new phylogenetic grouping in the PFK-A family
Structure function analysis of ADP-dependent cyanobacterial phosphofructokinase reveals new phylogenetic grouping in the PFK-A family Open
View article: Epigenetic control of tetrapyrrole biosynthesis by<sup>m4</sup>C DNA methylation in a cyanobacterium
Epigenetic control of tetrapyrrole biosynthesis by<sup>m4</sup>C DNA methylation in a cyanobacterium Open
Epigenetic DNA modifications are pivotal in eukaryotic gene expression, but their regulatory significance in bacteria is less understood. In Synechocystis 6803, the DNA methyltransferase M.Ssp6803II modifies the first cytosine in the GGCC …
View article: The primary carbon metabolism in cyanobacteria and its regulation
The primary carbon metabolism in cyanobacteria and its regulation Open
Cyanobacteria are the only prokaryotes capable of performing oxygenic photosynthesis. Many cyanobacterial strains can live in different trophic modes, ranging from photoautotrophic and heterotrophic to mixotrophic growth. However, the regu…
View article: Stochastic Character Mapping, Bayesian Model Selection, and Biosynthetic Pathways Shed New Light on the Evolution of Habitat Preference in Cyanobacteria
Stochastic Character Mapping, Bayesian Model Selection, and Biosynthetic Pathways Shed New Light on the Evolution of Habitat Preference in Cyanobacteria Open
Cyanobacteria are the only prokaryotes to have evolved oxygenic photosynthesis paving the way for complex life. Studying the evolution and ecological niche of cyanobacteria and their ancestors is crucial for understanding the intricate dyn…
View article: Positional<sup>13</sup>C Enrichment Analysis of Aspartate by GC-MS to Determine PEPC Activity<i>In Vivo</i>
Positional<sup>13</sup>C Enrichment Analysis of Aspartate by GC-MS to Determine PEPC Activity<i>In Vivo</i> Open
Photoautotrophic organisms fix inorganic carbon (Ci) by two enzymes, ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) and phosphoenolpyruvate carboxylase (PEPC). RUBISCO assimilates Ci (CO2) into the 1-C position of 3-phosphoglyce…
View article: The redox-sensitive R-loop of the carbon control protein SbtB contributes to the regulation of the cyanobacterial CCM
The redox-sensitive R-loop of the carbon control protein SbtB contributes to the regulation of the cyanobacterial CCM Open
View article: Thioredoxins <i>o1</i> and <i>h2</i> jointly adjust mitochondrial dihydrolipoamide dehydrogenase‐dependent pathways towards changing environments
Thioredoxins <i>o1</i> and <i>h2</i> jointly adjust mitochondrial dihydrolipoamide dehydrogenase‐dependent pathways towards changing environments Open
Thioredoxins (TRXs) are central to redox regulation, modulating enzyme activities to adapt metabolism to environmental changes. Previous research emphasized mitochondrial and microsomal TRX o1 and h2 influence on mitochondrial metabolism, …
View article: Photosynthetic response of <i>Chara braunii</i> towards different bicarbonate concentrations
Photosynthetic response of <i>Chara braunii</i> towards different bicarbonate concentrations Open
A variety of inorganic carbon acquisition modes have been proposed in Characean algae, however, a broadly applicable inorganic carbon uptake mechanism is unknown for the genus Chara . In the present study, we analyzed if C. braunii can eff…
View article: Protein NirP1 regulates nitrite reductase and nitrite excretion in cyanobacteria
Protein NirP1 regulates nitrite reductase and nitrite excretion in cyanobacteria Open
View article: Using gene complementation to identify a SulP-family bicarbonate transporter in an N2-fixing cyanobacterial endosymbiont of an open ocean diatom
Using gene complementation to identify a SulP-family bicarbonate transporter in an N2-fixing cyanobacterial endosymbiont of an open ocean diatom Open
Diatom-Diazotrophic Associations (DDAs) contribute significantly to new and primary production in the world’s oceans, yet the understanding of how production is sustained is poorly resolved. These symbioses involve diatoms and N 2 -fixing,…
View article: Diurnal rhythm causes metabolic crises in the cyanobacterial mutants of c-di-AMP signalling cascade
Diurnal rhythm causes metabolic crises in the cyanobacterial mutants of c-di-AMP signalling cascade Open
In nature, the photoautotrophic lifestyle of cyanobacteria has to cope with the successive diurnal changes in light supply. Light supply throughout the day enables photosynthesis and glycogen biosynthesis, while night phases require the sw…
View article: The impact of salt stress on the physiology and the transcriptome of the model streptophyte green alga <i>Chara braunii</i>
The impact of salt stress on the physiology and the transcriptome of the model streptophyte green alga <i>Chara braunii</i> Open
Chara braunii is a model for early land plant evolution and terrestrialization. Salt stress has a profound effect on water and ion transport activities, thereby interacting with many other processes, including inorganic carbon acquisition …
View article: The Role of Serine/Threonine-Specific Protein Kinases in Cyanobacteria - SpkB Is Involved in Acclimation to Fluctuating Conditions in Synechocystis sp. PCC 6803
The Role of Serine/Threonine-Specific Protein Kinases in Cyanobacteria - SpkB Is Involved in Acclimation to Fluctuating Conditions in Synechocystis sp. PCC 6803 Open
View article: The redox-sensitive R-loop of the carbon control protein SbtB contributes to the regulation of the cyanobacterial CCM
The redox-sensitive R-loop of the carbon control protein SbtB contributes to the regulation of the cyanobacterial CCM Open
SbtB is a PII-like protein that regulates the carbon-concentrating mechanism (CCM) in cyanobacteria. SbtB proteins can bind many adenyl nucleotides and possess a characteristic C-terminal redox sensitive loop (R-loop) that forms a disulfid…