TY  - JOUR
A1  - Adels, Klaudia
A1  - Elbers, Gereon
A1  - Diehl, Bernd
A1  - Monakhova, Yulia
T1  - Multicomponent analysis of dietary supplements containing glucosamine and chondroitin: comparative low- and high-field NMR spectroscopic study
JF  - Analytical Sciences
N2  - With the prevalence of glucosamine- and chondroitin-containing dietary supplements for people with osteoarthritis in the marketplace, it is important to have an accurate and reproducible analytical method for the quantitation of these compounds in finished products. NMR spectroscopic method based both on low- (80 MHz) and high- (500–600 MHz) field NMR instrumentation was established, compared and validated for the determination of chondroitin sulfate and glucosamine in dietary supplements. The proposed method was applied for analysis of 20 different dietary supplements. In the majority of cases, quantification results obtained on the low-field NMR spectrometer are similar to those obtained with high-field 500–600 MHz NMR devices. Validation results in terms of accuracy, precision, reproducibility, limit of detection and recovery demonstrated that the developed method is fit for purpose for the marketed products. The NMR method was extended to the analysis of methylsulfonylmethane, adulterant maltodextrin, acetate and inorganic ions. Low-field NMR can be a quicker and cheaper alternative to more expensive high-field NMR measurements for quality control of the investigated dietary supplements. High-field NMR instrumentation can be more favorable for samples with complex composition due to better resolution, simultaneously giving the possibility of analysis of inorganic species such as potassium and chloride.
KW  - Glucosamine
KW  - Chondroitin sulfate
KW  - Polysaccharides
KW  - Dietary supplements
KW  - High-field NMR
Y1  - 2023
U6  - http://dx.doi.org/10.1007/s44211-023-00433-2
SN  - 1348-2246 (Online)
SN  - 0910-6340 (Print)
N1  - Corresponding author: Yulia Monakhova
VL  - 2023
PB  - Springer Verlag
CY  - Cham
ER  - 
TY  - JOUR
A1  - Falkenberg, Fabian
A1  - Kohn, Sophie
A1  - Bott, Michael
A1  - Bongaerts, Johannes
A1  - Siegert, Petra
T1  - Biochemical characterisation of a novel broad pH spectrum subtilisin from Fictibacillus arsenicus DSM 15822ᵀ
JF  - FEBS Open Bio
N2  - Subtilisins from microbial sources, especially from the Bacillaceae family, are of particular interest for biotechnological applications and serve the currently growing enzyme market as efficient and novel biocatalysts. Biotechnological applications include use in detergents, cosmetics, leather processing, wastewater treatment and pharmaceuticals. To identify a possible candidate for the enzyme market, here we cloned the gene of the subtilisin SPFA from Fictibacillus arsenicus DSM 15822ᵀ (obtained through a data mining-based search) and expressed it in Bacillus subtilis DB104. After production and purification, the protease showed a molecular mass of 27.57 kDa and a pI of 5.8. SPFA displayed hydrolytic activity at a temperature optimum of 80 °C and a very broad pH optimum between 8.5 and 11.5, with high activity up to pH 12.5. SPFA displayed no NaCl dependence but a high NaCl tolerance, with decreasing activity up to concentrations of 5 m NaCl. The stability enhanced with increasing NaCl concentration. Based on its substrate preference for 10 synthetic peptide 4-nitroanilide substrates with three or four amino acids and its phylogenetic classification, SPFA can be assigned to the subgroup of true subtilisins. Moreover, SPFA exhibited high tolerance to 5% (w/v) SDS and 5% H₂O₂ (v/v). The biochemical properties of SPFA, especially its tolerance of remarkably high pH, SDS and H₂O₂, suggest it has potential for biotechnological applications.
KW  - Bacillaceae
KW  - Biotechnological application
KW  - Broad pH spectrum
KW  - Subtilases
KW  - Subtilisin
Y1  - 2023
U6  - http://dx.doi.org/10.1002/2211-5463.13701
SN  - 2211-5463
N1  - Corresponding author: Petra Siegert
VL  - 13
IS  - 11
SP  - 2035
EP  - 2046
PB  - Wiley
CY  - Hoboken, NJ
ER  - 
TY  - JOUR
A1  - Dellmann, Sophia Florence
A1  - Glorius, J.
A1  - Litvinov, Yu A.
A1  - Reifarth, R.
A1  - Al-Khasawneh, Kafa
A1  - Aliotta, M.
A1  - Bott, L.
A1  - Brückner, Benjamin
A1  - Bruno, C. G.
A1  - Chen, Ruijiu
A1  - Davinson, T.
A1  - Dickel, T.
A1  - Dillmann, Iris
A1  - Dmytriev, D.
A1  - Erbacher, P.
A1  - Freire-Fernández, D.
A1  - Forstner, Oliver
A1  - Geissel, H.
A1  - Göbel, K.
A1  - Griffin, Christopher J.
A1  - Grisenti, R.
A1  - Gumberidze, Alexandre
A1  - Haettner, Emma
A1  - Hagmann, Siegbert
A1  - Heil, M.
A1  - Heß, R.
A1  - Hillenbrand, P.-M.
A1  - Joseph, R.
A1  - Jurado, B.
A1  - Kozhuharov, Christophor
A1  - Kulikov, I.
A1  - Löher, Bastian
A1  - Langer, Christoph
A1  - Leckenby, Guy
A1  - Lederer-Woods, C.
A1  - Lestinsky, M.
A1  - Litvinov, S. A.
A1  - Lorenz, B. A.
A1  - Lorenz, E.
A1  - Marsh, J.
A1  - Menz, Esther Babette
A1  - Morgenroth, T.
A1  - Petridis, N.
A1  - Pibernat, Jerome
A1  - Popp, U.
A1  - Psaltis, Athanasios
A1  - Sanjari, Shahab
A1  - Scheidenberger, C.
A1  - Sguazzin, M.
A1  - Sidhu, Ragandeep Singh
A1  - Spillmann, Uwe
A1  - Steck, M.
A1  - Stöhlker, T.
A1  - Surzhykov, A.
A1  - Swartz, J. A.
A1  - Törnqvist, H.
A1  - Varga, L.
A1  - Vescovi, Diego
A1  - Weick, H.
A1  - Weigand, M.
A1  - Woods, P.
A1  - Xing, Y.
A1  - Yamaguchi, Taiyo
T1  - Proton capture on stored radioactive ¹¹⁸Te ions
JF  - EPJ Web of Conferences
N2  - Experimental determination of the cross sections of proton capture on radioactive nuclei is extremely difficult. Therefore, it is of substantial interest for the understanding of the production of the p-nuclei. For the first time, a direct measurement of proton-capture cross sections on stored, radioactive ions became possible in an energy range of interest for nuclear astrophysics. The experiment was performed at the Experimental Storage Ring (ESR) at GSI by making use of a sensitive method to measure (p,γ) and (p,n) reactions in inverse kinematics. These reaction channels are of high relevance for the nucleosyn-thesis processes in supernovae, which are among the most violent explosions in the universe and are not yet well understood. The cross section of the ¹¹⁸Te(p,γ) reaction has been measured at energies of 6 MeV/u and 7 MeV/u. The heavy ions interacted with a hydrogen gas jet target. The radiative recombination process of the fully stripped ¹¹⁸Te ions and electrons from the hydrogen target was used as a luminosity monitor. An overview of the experimental method and preliminary results from the ongoing analysis will be presented.
Y1  - 2023
U6  - http://dx.doi.org/10.1051/epjconf/202327911018
SN  - 2100-014X
N1  - Volume 279, 2023. Nuclear Physics in Astrophysics – X (NPA-X 2022).
VL  - 279
IS  - Article Number: 11018
SP  - 1
EP  - 5
PB  - EDP Sciences
ER  - 
TY  - JOUR
A1  - Hoffstadt, Kevin
A1  - Cheenakula, Dheeraja
A1  - Nikolausz, Marcell
A1  - Krafft, Simone
A1  - Harms, Hauke
A1  - Kuperjans, Isabel
T1  - Design and construction of a new reactor for flexible biomethanation of hydrogen
JF  - Fermentation
N2  - The increasing share of renewable electricity in the grid drives the need for sufficient storage capacity. Especially for seasonal storage, power-to-gas can be a promising approach. Biologically produced methane from hydrogen produced from surplus electricity can be used to substitute natural gas in the existing infrastructure. Current reactor types are not or are poorly optimized for flexible methanation. Therefore, this work proposes a new reactor type with a plug flow reactor (PFR) design. Simulations in COMSOL Multiphysics ® showed promising properties for operation in laminar flow. An experiment was conducted to support the simulation results and to determine the gas fraction of the novel reactor, which was measured to be 29%. Based on these simulations and experimental results, the reactor was constructed as a 14 m long, 50 mm diameter tube with a meandering orientation. Data processing was established, and a step experiment was performed. In addition, a kLa of 1 h−1 was determined. The results revealed that the experimental outcomes of the type of flow and gas fractions are in line with the theoretical simulation. The new design shows promising properties for flexible methanation and will be tested.
KW  - methanation
KW  - plug flow reactor
KW  - bubble column
KW  - bio-methane
KW  - power-to-gas
Y1  - 2023
U6  - http://dx.doi.org/10.3390/fermentation9080774
SN  - 2311-5637
N1  - The article belongs to the Special Issue Fermentation Processes: Modeling, Optimization and Control
VL  - 9
IS  - 8
SP  - 1
EP  - 16
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - El Bergui, Omnia
A1  - Abouabdillah, Aziz
A1  - Bourioug, Mohamed
A1  - Schmitz, Dominik
A1  - Biel, Markus
A1  - Aboudrare, Abdellah
A1  - Krauss, Manuel
A1  - Jomaa, Ahlem
A1  - Romuli, Sebastian
A1  - Müller, Joachim
A1  - Fagroud, Mustapha
A1  - Bouabid, Rachid
T1  - Innovative solutions for drought: Evaluating hydrogel application on onion cultivation (Allium cepa) in Morocco
JF  - Water
N2  - Throughout the last decade, and particularly in 2022, water scarcity has become a critical concern in Morocco and other Mediterranean countries. The lack of rainfall during spring was worsened by a succession of heat waves during the summer. To address this drought, innovative solutions, including the use of new technologies such as hydrogels, will be essential to transform agriculture. This paper presents the findings of a study that evaluated the impact of hydrogel application on onion (Allium cepa) cultivation in Meknes, Morocco. The treatments investigated in this study comprised two different types of hydrogel-based soil additives (Arbovit® polyacrylate and Huminsorb® polyacrylate), applied at two rates (30 and 20 kg/ha), and irrigated at two levels of water supply (100% and 50% of daily crop evapotranspiration; ETc). Two control treatments were included, without hydrogel application and with both water amounts. The experiment was conducted in an open field using a completely randomized design. The results indicated a significant impact of both hydrogel-type dose and water dose on onion plant growth, as evidenced by various vegetation parameters. Among the hydrogels tested, Huminsorb® Polyacrylate produced the most favorable outcomes, with treatment T9 (100%, HP, 30 kg/ha) yielding 70.55 t/ha; this represented an increase of 11 t/ha as compared to the 100% ETc treatment without hydrogel application. Moreover, the combination of hydrogel application with 50% ETc water stress showed promising results, with treatment T4 (HP, 30 kg, 50%) producing almost the same yield as the 100% ETc treatment without hydrogel while saving 208 mm of water.
KW  - water economy
KW  - yield
KW  - deficit irrigation
KW  - hydrogel
KW  - onion
Y1  - 2023
U6  - http://dx.doi.org/10.3390/w15111972
VL  - 15
IS  - 11
PB  - MDPI
CY  - Basel
ER  - 
TY  - JOUR
A1  - Haeger, Gerrit
A1  - Probst, Johanna
A1  - Jaeger, Karl-Erich
A1  - Bongaerts, Johannes
A1  - Siegert, Petra
T1  - Novel aminoacylases from Streptomyces griseus DSM 40236 and their recombinant production in Streptomyces lividans
JF  - FEBS Open Bio
N2  - Amino acid-based surfactants are valuable compounds for cosmetic formulations. The chemical synthesis of acyl-amino acids is conventionally performed by the Schotten-Baumann reaction using fatty acyl chlorides, but aminoacylases have also been investigated for use in biocatalytic synthesis with free fatty acids. Aminoacylases and their properties are diverse; they belong to different peptidase families and show differences in substrate specificity and biocatalytic potential. Bacterial aminoacylases capable of synthesis have been isolated from Burkholderia, Mycolicibacterium, and Streptomyces. Although several proteases and peptidases from S. griseus have been described, no aminoacylases from this species have been identified yet. In this study, we investigated two novel enzymes produced by S. griseus DSM 40236ᵀ . We identified and cloned the respective genes and recombinantly expressed an α-aminoacylase (EC 3.5.1.14), designated SgAA, and an ε-lysine acylase (EC 3.5.1.17), designated SgELA, in S. lividans TK23. The purified aminoacylase SgAA was biochemically characterized, focusing on its hydrolytic activity to determine temperature- and pH optima and stabilities. The aminoacylase could hydrolyze various acetyl-amino acids at the Nα -position with a broad specificity regarding the sidechain. Substrates with longer acyl chains, like lauroyl-amino acids, were hydrolyzed to a lesser extent. Purified aminoacylase SgELA specific for the hydrolysis of Nε -acetyl-L-lysine was unstable and lost its enzymatic activity upon storage for a longer period but could initially be characterized. The pH optimum of SgELA was pH 8.0. While synthesis of acyl-amino acids was not observed with SgELA, SgAA catalyzed the synthesis of lauroyl-methionine.
KW  - Streptomyces lividans
KW  - recombinant expression
KW  - Streptomyces griseus
KW  - ε-lysine acylase
KW  - α-aminoacylase
Y1  - 2023
U6  - http://dx.doi.org/10.1002/2211-5463.13723
SN  - 2211-5463
N1  - Corresponding author: Petra Siegert
VL  - 13
IS  - 12
SP  - 2224
EP  - 2238
PB  - Wiley
CY  - Hoboken, NJ
ER  - 
TY  - JOUR
A1  - Barbazán, Paula
A1  - Hagenbach, Adelheid
A1  - Paulßen, Elisabeth
A1  - Abram, Ulrich
A1  - Carballo, Rosa
A1  - Rodriguez-Hermida, Sabina
A1  - Vázquez-López, Ezequiel M.
T1  - Tricarbonyl Rhenium(I) and Technetium(I) Complexes with Hydrazones Derived from 4,5-Diazafluoren-9-one and 1,10-Phenanthroline-5,6-dione
JF  - European Journal of Inorganic Chemistry
N2  - Tricarbonylrhenium(I) and -technetium(I) halide (halide = Cl and Br) complexes of ligands derived from 4,5-diazafluoren-9-one (df) and 1,10-phenanthroline-5,6-dione (phen) derivatives of benzoic and 2-hydroxybenzoic acid hydrazides have been prepared. The complexes have been characterized by elemental analysis, MS, IR, 1H NMR and absorption and emission UV/Vis spectroscopic methods. The metal centres (ReI and TcI) are coordinated through the nitrogen imine atoms and establish five-membered chelate rings, whereas the hydrazone groups stand uncoordinated. The 1H NMR spectra suggest the same behaviour in solution on the basis of only marginal variations in the chemical shifts of the hydrazine protons.
Y1  - 2010
U6  - http://dx.doi.org/10.1002/ejic.201000522
SN  - 1099-0682
IS  - 29
SP  - 4622
EP  - 4630
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Paulßen, Elisabeth
A1  - Schweighöfer, Philip V.
A1  - Abram, Ulrich
T1  - Reactions of [ReOX3(PPh3)2] Complexes (X = Cl, Br) with Phenylacetylene and the Structures of the Products
JF  - Zeitschrift für anorganische und allgemeine Chemie : ZAAC = Journal of inorganic and general chemistry
N2  - Oxorhenium(V) complexes [ReOX3(PPh3)2] (X = Cl, Br) react with phenylacetylene under formation of complexes with ylide-type ligands. Compounds of the compositions [ReOCl3(PPh3){C(Ph)C(H)(PPh3)}] (1), [ReOBr3(OPPh3){C(Ph)C(H)(PPh3)}] (2), and [ReOBr3(OPPh3){C(H)C(Ph)(PPh3)}] (3) were isolated and characterized by X-ray diffraction. They contain a ligand, which was formed by a nucleophilic attack of released PPh3 at coordinated phenylacetylene. The structures of the products show that there is no preferable position for this attack. Cleavage of the Re–C bond in 3 and dimerization of the organic ligand resulted in the formation of the [{(PPh3)(H)CC(Ph)}2]2+ cation, which crystallized as its [(ReOBr4)(OReO3)]2– salt.
Y1  - 2010
U6  - http://dx.doi.org/10.1002/zaac.200900478
SN  - 1521-3749
VL  - 636
IS  - 5
SP  - 779
EP  - 783
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Paulßen, Elisabeth
A1  - Alberto, Roger
A1  - Abram, Ulrich
T1  - Synthesis, Characterization, and Structures of R3EOTcO3 Complexes (E = C, Si, Ge, Sn, Pb) and Related Compounds
JF  - Inorganic Chemistry
N2  - AgTcO4 reacts with R3ECl compounds (E = C, Si, Ge, Sn, Pb; R = Me, iPr, tBu, Ph), tBu2SnCl2, or PhMgCl under formation of novel trioxotechnetium(VII) derivatives. The carbon and silicon derivatives readily undergo decomposition, which was proven by 99Tc NMR spectroscopy and the isolation of decomposition products such as [TcOCl3(THF)(OH2)]. Compounds [Ph3GeOTcO3], [(THF)Ph3SnOTcO3], [(O3TcO)SntBu2(OH)]2, and [(THF)4Mg(OTcO3)2] are more stable and were isolated in crystalline form and characterized by X-ray diffraction.
Y1  - 2010
U6  - http://dx.doi.org/10.1021/ic1001094
SN  - 1520-510X
VL  - 49
IS  - 7
SP  - 3525
EP  - 3530
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Tippkötter, Nils
A1  - Roikaew, Wipa
A1  - Ulber, Roland
A1  - Hoffmann, Alexander
A1  - Denzler, Hans-Jörg
A1  - Buchholz, Heinrich
T1  - Paracoccus denitrificans for the effluent recycling during continuous denitrification of liquid food
JF  - Biotechnology Progress
N2  - Nitrate is an undesirable component of several foods. A typical case of contamination with high nitrate contents is whey concentrate, containing nitrate in concentrations up to 25 l. The microbiological removal of nitrate by Paracoccus denitrificans under formation of harmless nitrogen in combination with a cell retention reactor is described here. Focus lies on the resource-conserving design of a microbal denitrification process. Two methods are compared. The application of polyvinyl alcohol-immobilized cells, which can be applied several times in whey feed, is compared with the implementation of a two step denitrification system. First, the whey concentrate's nitrate is removed by ion exchange and subsequently the eluent regenerated by microorganisms under their retention by crossflow filtration. Nitrite and nitrate concentrations were determined by reflectometric color measurement with a commercially available Reflectoquant® device. Correction factors for these media had to be determined. During the pilot development, bioreactors from 4 to 250 mg·L-1 and crossflow units with membrane areas from 0.02 to 0.80 m2 were examined. Based on the results of the pilot plants, a scaling for the exemplary process of denitrifying 1,000 tons per day is discussed.
Y1  - 2010
U6  - http://dx.doi.org/10.1002/btpr.384
SN  - 8756-7938
VL  - 26
IS  - 3
SP  - 756
EP  - 762
PB  - Wiley
CY  - Hoboken, NJ
ER  - 
TY  - JOUR
A1  - Ulber, Roland
A1  - Poth, Sebastian
A1  - Monzon, Magaly
A1  - Tippkötter, Nils
T1  - Prozessintegration von Hydrolyse und Fermentation von Cellulose- Faserstoff
JF  - Chemie Ingenieur Technik
N2  - Ein viel versprechender erneuerbarer Rohstoff für die Produktion von Chemikalien und Treibstoffen ist Lignocellulose aus pflanzlicher Biomasse. Die darin enthaltenen Zucker können mittels enzymatischer Hydrolyse freigesetzt und fermentativ zu Ethanol umgesetzt werden. Ein interessanter Ansatz ist dabei die simultane Verzuckerung und Fermentation. Hefen und Enzyme haben mit 30 °C bzw. 50 °C zwar unterschiedliche Temperaturoptima, es konnte aber gezeigt werden, dass auch bei den niedrigeren Temperaturen eine Umsetzung der Cellulose zu Glucose erfolgt, wenn auch langsamer als bei optimalen Bedingungen. Außerdem konnte in Vorversuchen gezeigt werden, dass Ethanol in den zu erwartenden Konzentrationen keinen Einfluss auf die enzymatische Umsetzung hat.
Y1  - 2010
U6  - http://dx.doi.org/10.1002/cite.200900103
SN  - 1522-2640
N1  - Special Issue "Biokatalyse"
VL  - 82
IS  - 1-2
SP  - 135
EP  - 139
ER  - 
TY  - JOUR
A1  - Sieker, Tim
A1  - Neuner, Andreas
A1  - Dimitrova, Darina
A1  - Tippkötter, Nils
A1  - Bart, Hans-Jörg
A1  - Heinzle, Elmar
A1  - Ulber, Roland
T1  - Grassilage als Rohstoff für die chemische Industrie
JF  - Chemie Ingenieur Technik
N2  - Grassilage stellt einen nachwachsenden Rohstoff mit großem Potenzial dar. Neben Cellulose und Hemicellulose enthält sie auch organische Säuren, insbesondere Milchsäure. In einem Bioraffinerie-Projekt wird die Milchsäure aus der Silage isoliert und mit gentechnisch optimierten Stämmen zu L-Lysin weiterverarbeitet. Die Lignocellulose wird hydrolysiert und zu Ethanol fermentiert. Ein besonderes Augenmerk liegt auf der Integration der unterschiedlichen Prozesse sowie der einzelnen Prozessschritte zu einem Gesamtprozess, der sämtliche Inhaltsstoffe der Silage verwertet.
Y1  - 2010
U6  - http://dx.doi.org/10.1002/cite.201000088
SN  - 1522-2640
VL  - 82
IS  - 8, Special Issue: Industrielle Nutzung nachwachsender Rohstoffe
SP  - 1153
EP  - 1159
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Degering, Christian
A1  - Eggert, Thorsten
A1  - Puls, Michael
A1  - Bongaerts, Johannes
A1  - Evers, Stefan
A1  - Maurer, Karl-Heinz
A1  - Jaeger, Karl-Erich
T1  - Optimization of protease secretion in Bacillus subtilis and Bacillus licheniformis by screening of homologous and herologous signal peptides
JF  - Applied and environmental microbiology
N2  - Bacillus subtilis and Bacillus licheniformis are widely used for the large-scale industrial production of proteins. These strains can efficiently secrete proteins into the culture medium using the general secretion (Sec) pathway. A characteristic feature of all secreted proteins is their N-terminal signal peptides, which are recognized by the secretion machinery. Here, we have studied the production of an industrially important secreted protease, namely, subtilisin BPN′ from Bacillus amyloliquefaciens. One hundred seventy-three signal peptides originating from B. subtilis and 220 signal peptides from the B. licheniformis type strain were fused to this secretion target and expressed in B. subtilis, and the resulting library was analyzed by high-throughput screening for extracellular proteolytic activity. We have identified a number of signal peptides originating from both organisms which produced significantly increased yield of the secreted protease. Interestingly, we observed that levels of extracellular protease were improved not only in B. subtilis, which was used as the screening host, but also in two different B. licheniformis strains. To date, it is impossible to predict which signal peptide will result in better secretion and thus an improved yield of a given extracellular target protein. Our data show that screening a library consisting of homologous and heterologous signal peptides fused to a target protein can identify more-effective signal peptides, resulting in improved protein export not only in the original screening host but also in different production strains.
Y1  - 2010
U6  - http://dx.doi.org/10.1128/AEM.01146-10
SN  - 1098-5336 (E-Journal); 0003-6919 (Print); 0099-2240 (Print)
VL  - 76
IS  - 19
SP  - 6370
EP  - 6378
PB  - American Society for Microbiology
CY  - Washington, DC
ER  - 
TY  - JOUR
A1  - Schroeter, Rebecca
A1  - Hoffmann, Tamara
A1  - Voigt, Birgit
A1  - Meyer, Hanna
A1  - Bleisteiner, Monika
A1  - Muntel, Jan
A1  - Jürgen, Britta
A1  - Albrecht, Dirk
A1  - Becher, Dörte
A1  - Lalk, Michael
A1  - Evers, Stefan
A1  - Bongaerts, Johannes
A1  - Maurer, Karl-Heinz
A1  - Putzer, Harald
A1  - Hecker, Michael
A1  - Schweder, Thomas
A1  - Bremer, Erhard
T1  - Stress responses of the industrial workhorse Bacillus licheniformis to osmotic challenges
JF  - PLoS ONE
N2  - The Gram-positive endospore-forming bacterium Bacillus licheniformis can be found widely in nature and it is exploited in industrial processes for the manufacturing of antibiotics, specialty chemicals, and enzymes. Both in its varied natural habitats and in industrial settings, B. licheniformis cells will be exposed to increases in the external osmolarity, conditions that trigger water efflux, impair turgor, cause the cessation of growth, and negatively affect the productivity of cell factories in biotechnological processes. We have taken here both systems-wide and targeted physiological approaches to unravel the core of the osmostress responses of B. licheniformis. Cells were suddenly subjected to an osmotic upshift of considerable magnitude (with 1 M NaCl), and their transcriptional profile was then recorded in a time-resolved fashion on a genome-wide scale. A bioinformatics cluster analysis was used to group the osmotically up-regulated genes into categories that are functionally associated with the synthesis and import of osmostress-relieving compounds (compatible solutes), the SigB-controlled general stress response, and genes whose functional annotation suggests that salt stress triggers secondary oxidative stress responses in B. licheniformis. The data set focusing on the transcriptional profile of B. licheniformis was enriched by proteomics aimed at identifying those proteins that were accumulated by the cells through increased biosynthesis in response to osmotic stress. Furthermore, these global approaches were augmented by a set of experiments that addressed the synthesis of the compatible solutes proline and glycine betaine and assessed the growth-enhancing effects of various osmoprotectants. Combined, our data provide a blueprint of the cellular adjustment processes of B. licheniformis to both sudden and sustained osmotic stress.
Y1  - 2014
U6  - http://dx.doi.org/10.1371/journal.pone.0080956
SN  - 1932-6203
VL  - 8
IS  - 11
PB  - PLOS
CY  - San Francisco
ER  - 
TY  - JOUR
A1  - Handtke, Stefan
A1  - Schroeter, Rebecca
A1  - Jürgen, Britta
A1  - Methling, Karen
A1  - Schlüter, Rabea
A1  - Albrecht, Dirk
A1  - Hijum, Sacha A. F. T. van
A1  - Bongaerts, Johannes
A1  - Maurer, Karl-Heinz
A1  - Lalk, Michael
A1  - Schweder, Thomas
A1  - Hecker, Michael
A1  - Voigt, Birgit
T1  - Bacillus pumilus reveals a remarkably high resistance to hydrogen peroxide provoked oxidative stress
JF  - PLOS one
N2  - Bacillus pumilus is characterized by a higher oxidative stress resistance than other comparable industrially relevant Bacilli such as B. subtilis or B. licheniformis. In this study the response of B. pumilus to oxidative stress was investigated during a treatment with high concentrations of hydrogen peroxide at the proteome, transcriptome and metabolome level. Genes/proteins belonging to regulons, which are known to have important functions in the oxidative stress response of other organisms, were found to be upregulated, such as the Fur, Spx, SOS or CtsR regulon. Strikingly, parts of the fundamental PerR regulon responding to peroxide stress in B. subtilis are not encoded in the B. pumilus genome. Thus, B. pumilus misses the catalase KatA, the DNA-protection protein MrgA or the alkyl hydroperoxide reductase AhpCF. Data of this study suggests that the catalase KatX2 takes over the function of the missing KatA in the oxidative stress response of B. pumilus. The genome-wide expression analysis revealed an induction of bacillithiol (Cys-GlcN-malate, BSH) relevant genes. An analysis of the intracellular metabolites detected high intracellular levels of this protective metabolite, which indicates the importance of bacillithiol in the peroxide stress resistance of B. pumilus.
Y1  - 2014
U6  - http://dx.doi.org/10.1371/journal.pone.0085625
SN  - 1932-6203
VL  - 9
IS  - 1
PB  - PLOS
CY  - San Francisco
ER  - 
TY  - JOUR
A1  - Immel, Timo A.
A1  - Groth, Ulrich
A1  - Huhn, Thomas
A1  - Öhlschläger, Peter
T1  - Titanium salan complexes displays strong antitumor properties in vitro and in vivo in mice
JF  - PLoS ONE
N2  - The anticancer activity of titanium complexes has been known since the groundbreaking studies of Köpf and Köpf-Maier on titanocen dichloride. Unfortunately, possibly due to their fast hydrolysis, derivatives of titanocen dichloride failed in clinical studies. Recently, the new family of titanium salan complexes containing tetradentate ONNO ligands with anti-cancer properties has been discovered. These salan complexes are much more stabile in aqueous media. In this study we describe the biological activity of two titanium salan complexes in a mouse model of cervical cancer. High efficiency of this promising complex family was demonstrated for the first time in vivo. From these data we conclude that titanium salan complexes display very strong antitumor properties exhibiting only minor side effects. Our results may influence the chemotherapy with metallo therapeutics in the future.
Y1  - 2011
U6  - http://dx.doi.org/10.1371/journal.pone.0017869
VL  - 6
IS  - 3
PB  - Plos
CY  - San Francisco, California, US
ER  - 
TY  - JOUR
A1  - Berndt, Heinz
T1  - Zur Reaktion von Iminodithiocarbonaten mit Carbonsäuren. I : Synthese des Modellpeptid-Derivates Z-(L)-Ala-(L/D)-Phe-(L)-Val-OMe
JF  - Tetrahedron letters
Y1  - 1980
U6  - http://dx.doi.org/10.1016/S0040-4039(00)78663-1
SN  - 0040-4039
VL  - 21
IS  - 34
SP  - 3265
EP  - 3268
ER  -