title: On-chip automation of cell-free protein synthesis: new opportunities due to a novel reaction mode.
abstract: Many pharmaceuticals are proteins or their development is based on proteins. Cell-free protein synthesis (CFPS) is an innovative alternative to conventional cell based systems which enables the production of proteins with complex and even new characteristics. However, the short lifetime, low protein production and expensive reagent costs are still limitations of CFPS. Novel automated microfluidic systems might allow continuous, controllable and resource conserving CFPS. The presented microfluidic TRITT platform (TRITT for Transcription - RNA Immobilization & Transfer - Translation) addresses the individual biochemical requirements of the transcription and the translation step of CFPS in separate compartments, and combines the reaction steps by quasi-continuous transfer of RNA templates to enable automated CFPS. In detail, specific RNA templates with 5' and 3' hairpin structures for stabilization against nucleases were immobilized during in vitro transcription by newly designed and optimized hybridization oligonucleotides coupled to magnetizable particles. Transcription compatibility and reusability for immobilization of these functionalized particles was successfully proven. mRNA transfer was realized on-chip by magnetic actuated particle transfer, RNA elution and fluid flow to the in vitro translation compartment. The applicability of the microfluidic TRITT platform for the production of the cytotoxic protein Pierisin with simultaneous incorporation of a non-canonical amino acid for fluorescence labeling was demonstrated. The new reaction mode (TRITT mode) is a modified linked mode that fulfills the precondition for an automated modular reactor system. By continual transfer of new mRNA, the novel procedure overcomes problems caused by nuclease digestion and hydrolysis of mRNA during TL in standard CFPS reactions.
authors.affiliation: Fraunhofer Institute for Reliability Microintegration, Department System Integration & Interconnection Technologies, Working Group Medical Microystems, Berlin, Germany. Erik.Jung@IZM.Fraunhofer.de and Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses Potsdam-Golm (IZI-BB), Potsdam, Germany. stefan.kubick@izi-bb.fraunhofer.de.
authors.forename: V
authors.initials: V
authors.lastname: Georgi
authors.affiliation: Technische Universität Berlin, Faculty Electrical Engineering Computer Science, Microperipheric Technologies, Berlin, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Georgi
authors.affiliation: Fraunhofer Institute for Reliability Microintegration, Department System Integration & Interconnection Technologies, Working Group Medical Microystems, Berlin, Germany. Erik.Jung@IZM.Fraunhofer.de.
authors.forename: M
authors.initials: M
authors.lastname: Blechert
authors.affiliation: Fraunhofer Institute for Reliability Microintegration, Department System Integration & Interconnection Technologies, Working Group Medical Microystems, Berlin, Germany. Erik.Jung@IZM.Fraunhofer.de.
authors.forename: M
authors.initials: M
authors.lastname: Bergmeister
authors.affiliation: Technische Universität Berlin, Faculty Electrical Engineering Computer Science, Microperipheric Technologies, Berlin, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Zwanzig
authors.affiliation: Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses Potsdam-Golm (IZI-BB), Potsdam, Germany. stefan.kubick@izi-bb.fraunhofer.de.
authors.forename: D A
authors.initials: DA
authors.lastname: Wüstenhagen
authors.affiliation: Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses Potsdam-Golm (IZI-BB), Potsdam, Germany. stefan.kubick@izi-bb.fraunhofer.de.
authors.forename: F F
authors.initials: FF
authors.lastname: Bier
authors.affiliation: Fraunhofer Institute for Reliability Microintegration, Department System Integration & Interconnection Technologies, Working Group Medical Microystems, Berlin, Germany. Erik.Jung@IZM.Fraunhofer.de.
authors.forename: E
authors.initials: E
authors.lastname: Jung
authors.affiliation: Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses Potsdam-Golm (IZI-BB), Potsdam, Germany. stefan.kubick@izi-bb.fraunhofer.de.
authors.forename: S
authors.initials: S
authors.lastname: Kubick
mesh_terms: D001331:Automation; D002474:Cell-Free System; D056656:Lab-On-A-Chip Devices; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism
chemical_list: D011506:Proteins; D012333:RNA, Messenger