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Autor(en): Wehrmann, Matthias
Klebensberger, Janosch
Titel: Engineering thermal stability and solvent tolerance of the soluble quinoprotein PedE from Pseudomonas putida KT2440 with a heterologous whole-cell screening approach
Erscheinungsdatum: 2018
Dokumentart: Zeitschriftenartikel
Seiten: 399-408
Erschienen in: Microbial biotechnology 11 (2018), pp. 399-408
URI: http://elib.uni-stuttgart.de/handle/11682/9938
http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-99382
http://dx.doi.org/10.18419/opus-9921
ISSN: 1751-7915
Zusammenfassung: Due to their ability for direct electron transfer to electrodes, the utilization of rare earth metals as cofactor, and their periplasmic localization, pyrroloquinoline quinone‐dependent alcohol dehydrogenases (PQQ‐ADHs) represent an interesting class of biocatalysts for various biotechnological applications. For most biocatalysts protein stability is crucial, either to increase the performance of the protein under a given process condition or to maximize robustness of the protein towards mutational manipulations, which are often needed to enhance or introduce a functionality of interest. In this study, we describe a whole‐cell screening assay, suitable for probing PQQ‐ADH activities in Escherichia coli BL21(DE3) cells, and use this assay to screen smart mutant libraries for increased thermal stability of the PQQ‐ADH PedE (PP_2674) from Pseudomonas putida KT2440. Upon three consecutive rounds of screening, we identified three different amino acid positions, which significantly improve enzyme stability. The subsequent combination of the beneficial mutations finally results in the triple mutant R91D/E408P/N410K, which not only exhibits a 7°C increase in thermal stability but also a twofold increase in residual activity upon incubation with up to 50% dimethyl sulfoxide (DMSO), while showing no significant difference in enzymatic efficiency (kcat/KM).
Enthalten in den Sammlungen:03 Fakultät Chemie

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mbt213036-sup-0001-Supinfo (1).pdfSupporting information1,32 MBAdobe PDFÖffnen/Anzeigen


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