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Year of publication
Institute
- INB - Institut für Nano- und Biotechnologien (542) (remove)
Document Type
- Article (542) (remove)
Keywords
- biosensors (4)
- frequency mixing magnetic detection (4)
- LAPS (3)
- Label-free detection (3)
- capacitive field-effect sensor (3)
- field-effect sensor (3)
- magnetic nanoparticles (3)
- tobacco mosaic virus (TMV) (3)
- Acyl-amino acids (2)
- Aminoacylase (2)
Muschallik, Lukas ; Molinnus, Denise ; Bongaerts, Johannes ; Pohl, Martina ; Wagner, Torsten ; Schöning, Michael Josef ; Siegert, Petra ; Selmer, Thorsten
The gene encoding a putative (R,R)-butane-2,3-diol dehydrogenase (bdhA) from Bacillus clausii DSM 8716T was isolated, sequenced and expressed in Escherichia coli. The amino acid sequence of the encoded protein is only distantly related to previously studied enzymes (identity 33–43%) and exhibited some uncharted peculiarities. An N-terminally StrepII-tagged enzyme variant was purified and initially characterized. The isolated enzyme catalyzed the (R)-specific oxidation of (R,R)- and meso-butane-2,3-diol to (R)- and (S)-acetoin with specific activities of 12 U/mg and 23 U/mg, respectively. Likewise, racemic acetoin was reduced with a specific activity of up to 115 U/mg yielding a mixture of (R,R)- and meso-butane-2,3-diol, while the enzyme reduced butane-2,3-dione (Vmax 74 U/mg) solely to (R,R)-butane-2,3-diol via (R)-acetoin. For these reactions only activity with the co-substrates NADH/NAD+ was observed. The enzyme accepted a selection of vicinal diketones, α-hydroxy ketones and vicinal diols as alternative substrates. Although the physiological function of the enzyme in B. clausii remains elusive, the data presented herein clearly demonstrates that the encoded enzyme is a genuine (R,R)-butane-2,3-diol dehydrogenase with potential for applications in biocatalysis and sensor development.
Achtsnicht, Stefan ; Tödter, Julia ; Niehues, Julia ; Telöken, Matthias ; Offenhäusser, Andreas ; Krause, Hans-Joachim ; Schröper, Florian
For performing point-of-care molecular diagnostics, magnetic immunoassays constitute a promising alternative to established enzyme-linked immunosorbent assays (ELISA) because they are fast, robust and sensitive. Simultaneous detection of multiple biomolecular targets from one body fluid sample is desired. The aim of this work is to show that multiplex magnetic immunodetection based on magnetic frequency mixing by means of modular immunofiltration columns prepared for different targets is feasible. By calculations of the magnetic response signal, the required spacing between the modules was determined. Immunofiltration columns were manufactured by 3D printing and antibody immobilization was performed in a batch approach. It was shown experimentally that two different target molecules in a sample solution could be individually detected in a single assaying step with magnetic measurements of the corresponding immobilization filters. The arrangement order of the filters and of a negative control did not influence the results. Thus, a simple and reliable approach to multi-target magnetic immunodetection was demonstrated.
An improved and convenient ninhydrin assay for aminoacylase activity measurements was developed using the commercial EZ Nin™ reagent. Alternative reagents from literature were also evaluated and compared. The addition of DMSO to the reagent enhanced the solubility of Ruhemann's purple (RP). Furthermore, we found that the use of a basic, aqueous buffer enhances stability of RP. An acidic protocol for the quantification of lysine was developed by addition of glacial acetic acid. The assay allows for parallel processing in a 96-well format with measurements microtiter plates.
Bohrn, Ulrich ; Mucha, Andreas ; Werner, Frederik ; Trattner, Barbara ; Bäcker, Matthias ; Krumbe, Christoph ; Schienle, Meinrad ; Stütz, Evamaria ; Schmitt-Landsiedel, Doris ; Fleischer, Maximilian ; Wagner, Patrick ; Schöning, Michael Josef
Wagner, Torsten ; Werner, Frederik ; Miyamoto, Ko-Ichiro ; Schöning, Michael Josef ; Yoshinobu, Tatsuo
A high-Q resonance-mode measurement of EIS capacitive sensor by elimination of series resistance
(2017)
Miyamoto, Ko-ichiro ; Hayashi, Kosuke ; Sakamoto, Azuma ; Werner, Frederik ; Wagner, Torsten ; Schöning, Michael Josef ; Yoshinobu, Tatsuo
An EIS capacitive sensor is a semiconductor-based potentiometric sensor, which is sensitive to the ion concentration or pH value of the solution in contact with the sensing surface. To detect a small change in the ion concentration or pH, a small capacitance change must be detected. Recently, a resonance-mode measurement was proposed, in which an inductor was connected to the EIS capacitive sensor and the resonant frequency was correlated with the pH value. In this study, the Q factor of the resonant circuit was enhanced by canceling the internal resistance of the reference electrode and the internal resistance of the inductor coil with the help of a bypass capacitor and a negative impedance converter, respectively. 1% variation of the signal in the developed system corresponded to a pH change of 3.93 mpH, which was about 1/12 of the conventional method, suggesting a better performance in detection of a small pH change.
Monitoring the cellular metabolism of bacteria in (bio)fermentation processes is crucial to control and steer them, and to prevent undesired disturbances linked to metabolically inactive microorganisms. In this context, cell-based biosensors can play an important role to improve the quality and increase the yield of such processes. This work describes the simultaneous analysis of the metabolic behavior of three different types of bacteria by means of a differential light-addressable potentiometric sensor (LAPS) set-up. The study includes Lactobacillus brevis, Corynebacterium glutamicum, and Escherichia coli, which are often applied in fermentation processes in bioreactors. Differential measurements were carried out to compensate undesirable influences such as sensor signal drift, and pH value variation during the measurements. Furthermore, calibration curves of the cellular metabolism were established as a function of the glucose concentration or cell number variation with all three model microorganisms. In this context, simultaneous (bio)sensing with the multi-organism LAPS-based set-up can open new possibilities for a cost-effective, rapid detection of the extracellular acidification of bacteria on a single sensor chip. It can be applied to evaluate the metabolic response of bacteria populations in a (bio)fermentation process, for instance, in the biogas fermentation process.
Wagner, Torsten ; Molina, R. ; Biselli, Manfred ; Canzoneri, Michele ; Schnitzler, Thomas ; Yoshinobu, Tatsuo ; Schöning, Michael Josef
Moreno i Codinachs, L. ; Birkenstock, C. ; Garma, T. ; Zierold, R. ; Bachmann, J. ; Nielsch, K. ; Schöning, Michael Josef ; Fontcuberta i Morral, A.
Mourzina, Y.G. ; Schöning, Michael Josef ; Schubert, J. ; Zander, W. ; Legin, A. V. ; Vlasov, Y. G. ; Kordos, P. ; Lüth, H.