Hyperadherence of Pseudomonas taiwanensis VLB120?C increases productivity of (S)-styrene oxide formation.

ABSTRACT: The attachment strength of biofilm microbes is responsible for the adherence of the cells to surfaces and thus is a critical parameter in biofilm processes. In tubular microreactors, aqueous-air segmented flow ensures an optimal oxygen supply and prevents excessive biofilm growth. However, organisms growing in these systems depend on an adaptation phase of several days, before mature and strong biofilms can develop. This is due to strong interfacial forces. In this study, a hyperadherent mutant of Pseudomonas taiwanensis VLB120?CeGFP possessing an engineered cyclic diguanylate metabolism, was applied to a continuous biofilm process for the production of (S)-styrene oxide. Cells of the mutant P.  taiwanensis VLB120?CeGFP ?04710, showing the same specific activity as the wild type, adhered substantially stronger to the substratum. Adaptation to the high interfacial forces was not necessary in these cases. Thereby, 40% higher final product concentrations were achieved and the maximal volumetric productivity of the parent strain was significantly surpassed by P. taiwanensis VLB120?CeGFP ?04710. Applying mutants with strong adhesion in biofilm-based catalysis opens the door to biological process control in future applications of catalytic biofilms using other industrially relevant strains.

SUBMITTER: Schmutzler K 

PROVIDER: S-EPMC5481534 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature